Technical Papers Search Results

All papers including those focused on technology and those detailing successful application of technology to a particular field. Papers are authored by Fugro-Jason staff and may be co-authored with clients. Papers are listed in chronological order with the newest first.

Integration of Geology and Geophysics Through Geostatistical Inversion: A Case Study
RockMod
This case study from a field offshore Vietnam shows that the seismic data are only able to constrain the vertical distribution of facies when the beds are close to or above seismic resolution.Prior facies probability trends are required to ensure that the detailed vertical distributions of facies are consistent with geological and reservoir engineering expectations. However, even when below seismic resolution and when the probability trens are laterally invariant, the lateral variations of facies are driven by the seismic data.
Sams, M., Millar, I., Satriawan, W., Saussus, D., Bhattacharyya, S. [2011] Integration of Geology and Geophysics Through Geostatistical Inversion: A Case Study. First Break, 29, 1-10.

Seismic inversion techniques: choice and benefits
InverTrace, RockTrace, StatMod MC, RockMod
This paper provides an overview of the general principles of deterministic and geostatistical inversions of seismic data. The authors demonstrate with a case study from the Timano-Pechora province that reservoir properties prediction methodology using geostatistical partial stacks inversion can facilitate high resolution 3D distribution of reservoir properties used to plan production well spacing, further verified by drilling.
Filippova, K., Kozhenkov, A. and Alabushin A. [2011] Seismic inversion techniques: choice and benefits. First Break, 29, 103 - 114.

Detecting thin Upper Morrow fluvial sands from geostatistical AVO inversion
RockMod
The consolidated rocks comprising the Upper Morrow fluvial sandstones of the Mid-continent are high-risk targets due to a lack of acoustic inctrast with their adjacent shales. The analysis of the field data using a simultaneous AVO inversion algorithm enabled reservoir sands to be highlighted in cross-plot space, enabling geobodies of reservoir sands to be captured and mapped.
Zawilla, J., Titchmarsh, H., Pendrel, J. and Valdez, A. [2010] A case study for detecting thin Upper Morrow fluvial sands in the United States Mid-continent from geostatistical AVO inversion. Presented at 80th SEG Annual Technical Conference and Exhibition, Denver, 17 - 22 October, 2010

Crosswell seismic imaging of acoustic and shear impedance in a Michigan reef
RockTrace
Acoustic and shear impedance images, obtained from deterministic simultaneous inversion of a high-resolution crosswell seismic survey, were used to obtain the internal structure of Niagaran reef in Michigan. The crosswell seismic survey was conducted using two monitor wells external to the reef. These wells had depths that extended beyond the depth of the reef, and imaging used reflections from above and beneath the reef, resulting in the best seismic images of any Niagaran pinnacle reef obtained to date.
Ibrahim, M., Pennington, W. and Turpening, R. [2010] Crosswell seismic imaging of acoustic and shear impedance in a Michigan reef. The Leading Edge, June 2010, 706 - 711.

3D geological model for a gas-saturated reservoir based on simultaneous inversion.
RockTrace, EarthModel FT
3D seismic exploration data plays a significant role in the geological modelling workflow, since it is used not only to build a structural framework of productive layers and to define boundaries of different facial environments, but also to predict the lateral distribution of reservoir properties (lithology, porosity, etc.). This becomes of particular importance when dealing with offshore fields for which the lack of high quality borehole data is common.
Yakovlev, I., Stein, Y., Barkov, A., Filippova, K. and Fedotov, S. [2010] 3D geological model for a gas-saturated reservoir based on simultaneous deterministic partial stack inversion. First Break, 28, 125 - 133.

Low Frequency Modeling and Uncertainty in Geostatistical Inversion
StatMod MC, RockMod
Geostatistical inversion is used for building reservoir models that honour a wide range of input data and account for uncertainties in that data. Multiple realisations are generated to quantify that uncertainty. A significant amount of this input is deterministic and thus results in models with too little variation of the low frequency component from realisation to realisation. Increased variation between the realisations can be introduced geostatistically and set to reproduce the uncertainty expected from analysis of well data.
- Sams, M.S. and Saussus, D. [2010] Low Frequency Modeling and Uncertainty in Geostatistical Inversion. 72nd EAGE Conference & Exhibition incorporating SPE EUROPEC 2010, Barcelona, Spain, 14 - 17 June 2010. P114

Quantitative Integration of Geology and Geophysics for Reservoir Modelling
RockMod, EarthModel FT
Geology, rock physics and geophysics are combined quantitatively in a geostatistical inversion to produce reservoir models of a tidally influenced shoreline to deltaic environment. The impact of the geological facies probability volumes versus the seismic influence on the results can be estimated by comparing models with those produced using probabilities alone and with those using seismic inversion alone.
Sams, M.S., Millar, I., Satriawan, W., Saussus, D. and Bhattacharyya, S. [2010] Quantitative Integration of Geology and Geophysics for Reservoir Modelling - A Case Study. 72nd EAGE Conference and Exhibition incorporating SPE EUROPEC 2010, Barcelona, Spain, 14 - 17 June 2010, F001

Updating Low Frequency Models
InverTrace, RockTrace
Imprecise information about high contrast layers directly above the reservoir causes residual sidelobes and other artifacts within the reservoir, leading to incorrect imaging close to high contrast layers. We propose a method to update the P-impedance low frequency model in order to account for high contrast P-impedance layers. The updating methodology is integrated in an iterative inversion scheme in which, after a first pass inversion, information of a laterally variable high contrast P-impedance layers is interpreted and used to update the P-impedance low frequency model for a new run of the inversion. The result is a better imaging in zones close to high contrast layers.
- Mesdag, P.R., Marquez, D., de Groot, L. and Aubin, V. [2010] Updating Low Frequency Models. 72nd EAGE Conference & Exhibition incorporating SPE EUROPEC 2010, Barcelona, Spain, 14 - 17 June 2010. F027.

Uncertainties in the quantitative interpretation of lithology probability volumes
RockTrace, RockMod
The interpretation of deterministic seismic inversion results can be greatly enhanced through the generation of lithology probability cubes (e.g., Avseth et al., 2005). This is particularly true when there are more than two lithology types or when the inversion has produced estimates of P-impedance and S-impedance (or some combination of these).
- Sams, M.S. and Saussus, D. [2010] Uncertainties in the quantitative interpretation of lithology probability volumes. The Leading Edge, May 2010, pp 576 - 583.

Comparison of uncertainty between deterministic and geostatistical inversion
FFP, RockTrace, RockMod
Assessment of the uncertainty associated with net pay estimates can be made from inversion of seismic data, either using deterministic inversion followed by probabilistic interpretation, or directly with geostatistical inversion.
- Sams, M.S. and Saussus, D. [2010] Comparison of lithology and net pay uncertainty between deterministic and geostatistical inversion workflows. First Break, vol 28, 35 - 44

Detection and Delineation of Thin-Sand Sedimentary Sequences With Joint Stochastic Inversion
RockMod
Paper describes the successful application of a new prestack stochastic inversion algorithm to the spatial delineation of thin reservoir units otherwise poorly defined with deterministic inversion procedures. The new stochastic inversion yields spatial distributions of lithottype and elastic properties with a vertical resolution between 10-15m that accurately describe spatial trends of clinoform sedimentary sequences and their associated reservoir units.
Merletti, G.D., and Torres-Verdin, C. [2010] Detection and Spatial Delineation of Thin-Sand Sedimentary Sequences With Joint Stochastic Inversion of Well Logs and 3D Prestack Seismic Amplitude Data. April 2010 SPE Reservoir Evaluation & Engineering, 246 - 264.

Models on the Mark
StatMod MC, EarthModel FT, RockScale, JasonSTS
A Seismic to Simulation study was undertaken on the Aboozar field with the goal of optimizing and quantifying ultimate production from the field. The resulting simulation model achieved a 95% match against well data with minimal permeability modifiers and NO porosity modifiers.
Timko, D. and Soni, S. [2009] Models on the Mark. Oilfield Technology, December, 2009.

Model Building
StatMod MC, RockMod
Using geostatistical inversion (pre or post-stack) builds superior geologic models for subsequent use in reservoir simulators. Topics include Quantitative Integration, Bayesian Inference, and Markov Chain Monte Carlo simulation.
- Saussus, D. [2009] Model Building. Oilfield Technology, Oct 2009

Geostatistical Inversion of Seismic Data from Thinly Bedded Ardley Coals
StatMod MC
3D seismic data, acquired to image the Ardley Coals, were deterministically inverted to estimate acoustic impedance. However, the band-limited results overestimate both the acoustic impedance of the coals and the thickness of the coal zones. Additionally, the thin sub-zones of the Ardley Coals are not differentiated in the inversion. A geostatistical inversion was conducted in an attempt to improve the inversion resolution and assess model uncertainty.
McCrank, J., Lawton, D. and Mangat, C. [2009] Geostatistical Inversion of Seismic Data from Thinly Bedded Ardley Coals. Frontiers + Innovation - 2009 CSPG/CSEG/CWLS Convention, Calgary, Alberta, Canada.

Understanding Lateral Reservoir Development through Partial Stack Seismic Forward Modeling - Vietnam Case Study
RockTrace, EarthModel
An AVA seismic forward modeling study was carried out with the objective of understanding the key contributors to amplitude response prior to further advanced processing such as Simultaneous Inversion work.
Satriawan, W., Millar, I., Lisapaly, L. and Ting, J. [2009] Understanding Lateral Reservoir Development through Partial Stack Seismic Forward Modeling - Case Study: “B” Field, Nam Con Son Basin – Vietnam. Proceedings, Indonesia Petroleum Association, Thirty Third Annual Convention and Exhibition, May, 2009

Extracting Detailed Lithology from Seismic Data
RockMod
Using a series of synthetic and real data examples, we will demonstrate how a geostatistical inversion algorithm can extract both lithology and elastic properties from angle-stack seismic data.
- Jarvis, K. and Saussus, D. [2009] Extracting Detailed Lithology from Seismic Data. Paper submitted to ASEG in 2009.

Interpretation and reservoir characterization of a field dominated by complex fluvial channels, Bohai Bay, China
InverTrace
The interpretation workflows presented in this paper were used to characterize and locate channel distributions. As a result, over 20 infill well locations were proposed and water injection selections were optimized so that each injection well could effectively penetrate multiple producing sands.
Ye, Q., WEN, X., Greene, M.G., Zhoa, C., Yang, Q., Yan, H., Hou, D. and Wang, L. [2009] Interpretation and reservoir characterization of a field dominated by complex fluvial channels, Bohai Bay, China, The Leading Edge, March, 2009, 346 - 352.

Inversion and interpretation of a 3D seismic data set from the Ouachita Mountains, Oklahoma
InverTrace, RockTrace
Acoustic impedance inversion (AI) and simultaneous angle-dependent inversion (SADI) of a 3D seismic data set to characterize reservoirs of Mississippian Morrowan age in the triangle zone of the frontal Ouachita Mountains, Oklahoma.
Aibaidula, A. and McMechan, G. [2009] Inversion and interpretation of a 3D seismic data set from the Ouachita Mountains, Oklahoma, Geophysics, Vol. 74, No. 2 (March-April 2009), P.B37 - B45.

Seismic to Simulation Workflow Achieves 95% History Match without Porosity Modifiers
JasonSTS
GDF-SUEZ teamed with Fugro-Jason to build a highly accurate, predictive reservoir model that incorporated all field data including seismic, wells and production history. This quantitative integration was expected to reduce uncertainty and enable better positioning of new wells. The outcome of the study was a new dynamic simulation model that honored all field data, reflected a disciplined workflow and was sufficiently fine-scale to predict the best locations for future drilling.
Castoro, A., Maguire, R. and de Groot, L. [2009] GDF-SUEZ E and P Nederland B.V. Bases Reservoir Development on Advanced Reservoir Model: Seismic to Simulation Workflow Achieves 95% History Match without Porosity Modifiers. Harts E&P, February 2009

Successful Fluid Discrimination in Tight, Overpressured Reservoirs using AVO Inversion
RockTrace
A multi-disciplinary and interactive approach, guided by seismic inversion techniques and real-time petrophysical data, resulted in the successful planning and execution of the Longtom-3 and subsequently the Longtom-4 drilling and evaluation program.
Rindschwentner, J. and Jarvis, K. [2009] Successful Fluid Discrimination in Tight, Overpressured Reservoirs using AVO Inversion. Presented at the 2009 ASEG Techncial Conference and Exhibition

An Integrated Case Study from Seismic to Simulation through Geostatistical Inversion
StatMod MC, JasonSTS
This paper describes the iterative seismic to simulation workflow followed to create a fine scale reservoir static and dynamic simulation model consistent with all available engineering, geologic and geophysical data.
Soni, S., Timko, D., Littmen, W., Karkooti, H., Karimi, S. and Kazamshiroodi, S. [2008] An Integrated Case Study from Seismic to Simulation through Geostatistical Inversion. 2008 Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, 3 - 6 November, 2006. SPE 118178.

AVO Interpretation in LMR Space: A Primer
RockTrace
In this paper we present how the more frequently used AVO attributes such as P-impedance, Simpedance, Vp/Vs and Poisson's Ratio petrophysically relate to l ×r and μ ×r as well as to each other in the LMR crossplot space. We also present how the magnitude and direction of anomalous movement away from a given non-reservoir reference point in LMR crossplot space can be related to fluid content and AVO class respectively, of the reservoir under scrutiny.
- Hoffe, B. H., Perez, M.A., and Goodway, W. [2008] Back to Exploration – 2008 CSPG/CSEG/CWLS Convention

Comparison of uncertainty estimates from deterministic and geostatistical inversion
StatMod MC
Uncertainty in lithology distribution and net pay thickness can be estimated from seismic data through inversion. Deterministic inversion followed by probabilistic interpretation produces uncertainties that are similar to those derived directly from geostatistical inversion. The uncertainties from the deterministic approach are slightly larger than those from geostatistical inversion, with the biggest differences associated with thin layers that are beyond seismic resolution.
- Sams, M. A. and Saussus, D. [2008] Comparison of uncertainty estimates from deterministic and geostatistical inversion. Proceedings, SEG Las vegas 2008 Annual Meeting, 1486 - 1490.

Detailed Geological Model of Carbonate Reservoir Based on Geostatistical AVA-inversion
RockMod, EarthModel FT
This study demonstrates how geostatistical AVA-inversion workflow was used to obtain reservoir properties and risk assessment of the Lekharyaga prospect area.
Rodina, O., Rabey, A., Makarova, L., Neudachin, D. and Corballo, J. [2008] Detailed Geological Model of Carbonate Reservoir Based on Geostatistical AVA-inversion - A Case Study. 70th EAGE Conference & Exhibition — Rome, Italy, 9 - 12 June 2008. I008.

Estimation of Hydrocarbons-in-place by Simultaneous (AVO) Inversion, constrained by iteratively derived low frequency models
RockTrace
In this study from offshore Norway, a 3D PSTM survey has been inverted for P-impedance and Vp/Vs. The aim of the inversion was to improve the interpretation of top reservoir, to estimate fluid content and to calculate pore volume.
- Hughes, P., van Eykenhof, R. and Mesdag, P. [2008] Not externally published.

New Iterative Approach Makes Compelling Case for Reservoir Modeling
EarthModel FT
A revolutionary new dynamic workflow is now possible, saving time over existing approaches and allowing operators to keep up with drilling schedules. New operational data and revised interpretations, such as a new well or a recently discovered fault, are easily incorporated into the model at any point in the workflow in a matter of minutes.
- Bhattacharyya, S. [2008] New Iterative Approach Makes Compelling Case for Reservoir Modeling. Saudi Arabia Oil & Gas, 5, 16-20

Oseberg South PP-PS Joint (AVA) inversion
RockTrace-PS
In this paper, we describe the Joint AVA inversion of multi-component ocean-bottom cable (OBC) data at Oseberg South, operated by StatoilHydro. The primary objective of the study was to discriminate between the main lithologies within the Ness formation (sands, shales and stacked coals), and specifically to delineate the sandy fluvial channel facies.
Niebuda, M., Mesdag, P. and Daniels, J. [2008] Oseberg South PP-PS Joint (AVA) inversion. Not externally published.

Overcoming Seismic Attenuation Caused By Shallow Gas Above
RockTrace
The result shows that lateral varying wavelets can compensate for the shallow gas effect in the seismic data, and reduce the uncertainty of the seismic inversion modeling for reservoir characterization.
Rudiana, C. W., Irawan, B. , Sulistiono, D. and Sams, M.S. [2008] Overcoming Seismic Attenuation Caused By Shallow Gas Above At A Gas Field Offshore Indonesia To Quantitatively Characterize The Reservoir Through Simultaneous Inversion. Proceedings, Indonesia Petroleum Association, Thirty-Second Annual Convention and Exhibition, May, 2008. IPA-G-134.

Reservoir Characterization beneath Shallow Gas Disturbances
StatMod MC
Seismic data are used to map both the structure and stratigraphy of reservoirs. Shallow gas in the form of gas chimneys and gas filled channels can seriously disturb the seismic data at reservoir level leading to significant difficulties in determining the reservoir distribution let alone the more quantitative aspects of the reservoir properties.
- Sams, M.S. [2008] Reservoir Characterization beneath Shallow Gas Disturbances. Not externally published

A comparison of porosity estimates obtained using post-, partial-, and prestack seismic inversion methods.
RockTrace
In this study, we invert a single seismic data set with deterministic post-, partial-, and prestack seismic inversion algorithms and transform the estimated elastic parameters into porosity to characterize Miocene reservoirs in Anadarko's deepwater Marco Polo Field.
Young, R.G. and Mrinal K. Sen, M.K. [2007] A comparison of porosity estimates obtained using post-, partial-, and prestack seismic inversion methods: Marco Polo Field, Gulf of Mexico. Proceedings - SEG San Antonio 2007 Annual Meeting 1790 - 1794.

Estimating Uncertainty in Reserves from Deterministic Seismic Inversion
StatMod MC
We present a methodology for deriving uncertainty estimates of rock and fluid distributions for qualitative and quantitative interpretation of deterministic seismic inversion data. The method integrates rock physics modelling with geostatistical forward modelling to provide a basis for interpretation of elastic properties from seismic inversion.
- Sams, M.S. and Saussus, D. [2007] Estimating Uncertainty in Reserves from Deterministic Seismic Inversion. Petroleum Geostatistics 2007, Cascais, Portugal, 10 - 14 September 2007, P17

Progressive Interactive Modeling Delivers Fast, Reliable Answers to Key Reservoir Questions
EarthModel FT
A new approach easily incorporates ongoing operational data, such as a new well or a recently discovered fault, into the model. The additional information can be easily inserted into the reservoir model at any point in the workflow.
- Bhattacharyya, S. [2007] Progressive Interactive Modeling Delivers Fast, Reliable Answers to Key Reservoir Questions. American Oil & Gas Reporter, November 2007

Reservoir compartment prediction of the Simpson field from the geostatistical inversion of AVO seismic data
RockMod
The analysis of the realizations output from the geostatistical inversion led to improved reservoir volumetric calculations and the identification of highly probable shale barriers.
- Jarvis, K., Folkers, A. and Saussus, D. [2007] Reservoir compartment prediction of the Simpson field from the geostatistical inversion of AVO seismic data. ASEG 2007 - Perth, Western Australia

Rock Physics and Petrophysics Integration as part of a Seismic Reservoir Characterization Workflow
RockTrace
This paper highlights the issues concerning the uncertainties in the processes of petrophysics, rock physics and synthetic to seismic well tie and illustrates how integration of petrophysics and rock physics can impact the final reservoir model.
- Sams, M.S. [2007]. Not externally published.

Seismic Inversion as an Exciting Tool to Delineate Facies Distribution in Carbonate Reservoirs
InverTrace
In order to reduce the risk for the future drilling plan, and to get a better understanding of the lateral facies distribution of reservoirs in the field, a constrained sparse spike inversion was applied to convert the 2D full-stack seismic data recorded in the area into 2D acoustic impedance lines, calibrated to the existing wells.
Hasanusi, D., Adhitiawan, E., Baasir, A., Lisapaly, L. and van Eykenhof, R. [2007] Seismic Inversion as an Exciting Tool to Delineate Facies Distribution in Tiaka Carbonate Reservoirs, Sulawest - Indonesia. Indonesian Petroleum Association Thirty First Annual Convention and Exhibition, May 2007. IPA07-G-008.

The quest for the low frequencies in pre-stack inversion
RockTrace, EarthModel
This paper presents successively the initial pre-stack inversion results of the high resolution data, those of the post-processed High Resolution and finally the results of the inversion combining the conventional and High Resolution surveys.
Pillet, W.R., Brechet, E., Mesdag, P., and Feroci, M. [2007] The quest for the low frequencies in pre-stack inversion. Proceedings - SEG 2007 San Antonio Annual Meeting, 1810 - 1814.

Tightly Integrating Petrophysics, Rock Physics Generates Improved Results
PowerLog
A tight integration offers significant value in both reduced uncertainty and improved field performance. By adopting tight integration, operators can reduce risk, improve process efficiency, enhance overall production and increase the return on economic assets.
- Baldwin, J. [2007] Tightly Integrating Petrophysics, Rock Physics In Single Model Generates Improved Results. American Oil & Gas Reporter.

Time Lapse Simultaneous Inversion at Girassol Field, Offshore Angola
RockTrace-4D
Full band-width simultaneous inversion was performed on a base and two monitor surveys over the Girassol field, offshore Angola. Careful calibration of the low frequency models of the elastic properties for the base survey was performed to identify the reservoir away from well control.
Jourdan, J.M., Lefeuvre, F. and Dubucq, D. [2007] Time Lapse Simultaneous Inversion at Girassol Field, Offshore Angola. EAGE 69th Conference & Exhibition — London, UK, 11 - 14 June 2007.

Extrapolation of Flow Units away from Wells with 3D Pre-Stack Seismic Amplitude Data
RockMod
We estimate the spatial continuity and lateral extent of lithologic units and flow units penetrated by wells, using pre-stack seismic amplitude data and well logs. The approach is based on a stochastic global inversion algorithm that concomitantly honors well logs and multiple partial angle-stacks of seismic amplitude data. Inversion results consist of 3D spatial distributions of elastic properties, litho-types, and petrophysical properties between wells.
Contreras, A., Torres-Verdin, C., Chesters, C., Kvien, K. and Fasnacht, T. [2006] Extrapolation of Flow Units away from Wells with 3D Pre-Stack Seismic Amplitude Data: Field Example. Petrophysics, Vol. 47, No. 3 (June 2006), P. 223 - 238.

Integrating Well and Seismic Data for Reservoir Characterization
RockTrace
In this paper, I discuss one of the ways that well and seismic data can be combined to form a reservoir model. A logical workflow is proposed that consists of a systematic progression from well data analysis, to rock physics analysis, to seismic inversion and finally reservoir property estimation.
- Jarvis, K. [2006] Integrating Well and Seismic Data for Reservoir Characterization: Risks and Rewards. AESC 2006, Melbourne, Australia.

Seismic Inversion - A Critical Tool in Reservoir Characterization
InverTrace, RockTrace
The principle objective of seismic inversion is to trarnsform seismic reflection data into a quantitative rock property, descriptive of the reservoir. In its most simple form, acoustic impedance logs are computed at each CMP. Compared to seismic amplitudes, inversions show higher resolution and support more accurate interpretations.
- Pendrel, J. [2006] Seismic Inversion - A Critical Tool in Reservoir Characterization. Scandinavian Oil Gas Magazine, 5/6 2006, 19-22.

Seismically Constrained Petrophysics in the Scarborough Area
RockTrace
In this paper, we discuss how we arrived at a seismically constrained petrophysical interpretation in the Scarborough gas field in the Exmouth Sub Basin, offshore North West Australia.
Sidi, F.H., Ilahi, A. and Duncan, G. [2006] Seismically Constrained Petrophysics in the Scarborough Area. AESC2006, Melbourne, Australia, 1 - 5.

Simultaneous Inversion Reduces Exploration Risk for the Flag Sandstone
RockTrace
The known oil and gas fields in the Early Cretaceous Flag Sandstone in the Barrow Sub-basin of the Carnarvon Basin offshore NW Australia are approaching depletion and the objectives of near-field exploration are to prove up additional reserves and maximize utilisation of existing production infrastructure.
Folkers, A. and Jarvis, K. [2006] Hydrocarbon Prediction Through Simultaneous Inversion Reduces Exploration Risk for the Flag Sandstone. AAPG 2006, Perth, Australia, 1 - 5.

AVA Stochastic Inversion of Pre-Stack Seismic Data and Well Logs for 3D Reservoir Modeling
RockMod, PowerLog, RPM
This paper describes the application of a novel AVA stochastic inversion algorithm to quantitatively integrate pre-stack seismic data and well logs. The stochastic inversion algorithm is used to characterize flow units of a deep-water Miocene reservoir located in the central Gulf of Mexico.
Contreras, A., Torres-Verdin, C., Kvein, K., Fasnacht, T. and Chesters, W. [2005] AVA Stochastic Inversion of Pre-Stack Seismic Data and Well Logs for 3D Reservoir Modeling. EAGE 67th Conference & Exhibition — Madrid, Spain, 13 - 16 June 2005. T-015.

Enhancing Consistency Between Geological Modeling and Seismic Inversion with Pseudo-Wells: Gendalo Field
RockTrace, EarthModel FT
Integration of a low frequency model during seismic inversion enhances the qualitative and quantitative interpretation level of inversion results.
Glenn, D., Berendson, E., Hariyannugraha, F., Skelt, C., Schneider, R., Lisapaly, L., Kirschner, K., van Eykenhof, R., Walden, S., Sams, M.S. and Smith, S. [2005] Enhancing Consistency Between Geological Modeling and Seismic Pre-Stack Amplitude Inversion with Pseudo-Wells: An Example from the Gendalo Field. Proceeedings, Indonesian Petroleum Association Thirtieth Annual Convention & Exhibition, August 2005. IPA-G-029.

Extending the Life of a Mature Area, Kotabatak Field, Central Sumatra Basin, Indonesia
RockTrace, StatMod MC
The high-resolution geostatistical simulation results of Kotabatak have provided an effective interpretation framework that assists detailed sequence stratigraphic mapping and information on reservoir quality. Recent new well log information confirms the results.
Hoehn, M.H., Arif, I., Welch, C., Sidi, F.H., Rubyanto, D., van Eykenhof, R., Sams, M.S. and Prasetyo, Y. [2005] Combined Geostatistical Inversion and Simultaneous AVA Inversion: Extending the Life of a Mature Area, Kotabatak Field, Central Sumatra Basin, Indonesia. Proceedings, Indonesian Petroleum Association Thirtieth Annual Conference and Exhibition, August 2005. IPA-G-083.

High resolution brings new insight into connectivity, reservoir size, sand quality
StatMod MC
By using a novel approach that ties pre-stack seismic and well log data, our team has built a uniquely detailed 3D model of Anadarko’s Marco Polo field, leading to a better understanding of the vertical and lateral extent as well as the quality of the reservoir.
Torres-Verdin, C. and Fasnacht, T. [2005] High resolution brings new insight into connectivity, reservoir size, sand quality. Reprinted with revisions to format, from the October 2005 edition of OFFSHORE Magazine.

Joint AVO Inversion with Geostatistical Simulation
RockMod
The use of both AVO and Geostatistical Simulation methods in Reservoir Characterization have become widespread over the past few years within the oil industry, with varying degrees of success, for use in Exploration, Appraisal and Development stages. Combining Geostatistical Simulation of reservoir properties with seismic data has been successfully achieved through the use of Geostatistical Inversion. Although successful, more benefit can be achieved by directly combining AVO information, via seismic angle or offset stacks, with Geostatistical Inversion, using a novel AVO inversion algorithm. This will be demonstrated with field examples.
- Leggett, M. and Chesters, W. [2005] Joint AVO Inversion with Geostatistical Simulation. Evolving Geophysics Through Innovation - 2005 CSEG National Convention, 199 - 201.

Joint Stochastic Inversion of Petrophysical Logs and 3D Pre-Stack Seismic Data to Assess the Spatial Continuity of Fluid Units Away from Wells
RockMod
This paper describes a novel methodology to integrate well logs and 3D pre-stack seismic data. The objective is to assess lateral continuity and spatial extent of lithology and fluid units penetrated by a well.
A. Contreras and C. Torres-Verdin, The University of Texas at Austin, W. Chesters and K. Kvien, Fugro-Jason Rotterdam, and M.Globe, Anadarko Petroleum Corporation

Longtom - Confirmation of a New Play in Offshore Gippsland
RockTrace
The study was based upon the inversion of Pre-Stack Time Migrated Gathers from a long-offset/high-angle seismic survey over the prospect. The goal was to recover density information as well as the more common elastic parameters P-Impedance and Vp/Vs.
Lanigan, K.P., Bunn, G. and Rindschwentner, J. [2005] Longtom - Confirmation of a New Play in Offshore Gippsland. APPEA Journal, Part 1, 89 - 103.

Integrating 4D seismic results into the reservoir simulations model. The Girassol case study.
RockTrace-4D
The 4D seismic data acquired on Girassol one year after the start of production have been used to update the reservoir flow model. First, the time-lapse seismic data and the reservoir flow model output have been transformed into directly comparable quantities (impedance) at the same spatial resolution. Then a comparison and analysis of discrepancies were performed. In a first qualitative step, these observations have been used to modify the reservoir model via manual adjiustments to the rock properties and reservoir boundaries. The next step will be quantitative use in a history matching procedure. NOTE - This is an update to the 2004 Girassol study incorporating a second monitor survey.
Jourdan, J.M., Lefeuvre, F. and Dubucq, D. [2004] Integrating 4D seismic results into the reservoir simulations model. The Girassol case study. EAGE 66th Conference and Exhibition, Paris, France, 7 - 10 June 2004, 13 - 16.

A Case Study of Inversion of Long Offset P-Wave Seismic Data into Elastic Parameters
RockTrace
The study was based upon the inversion of Pre-Stack Time Migrated Gathers from a long-offset/high-angle seismic survey over the prospect. The goal was to recover density information as well as the more common elastic parameters P-Impedance and Vp/Vs.
Roberts, R., Bedingfield, J., Guilloux, Y., Carr, M. and Mesdag, P. [2004] A Case Study of Inversion of Long Offset P-Wave Seismic Data into Elastic Parameters. EAGE 66th Conference & Exhibition — Paris, France, 7 - 10 June 2004. D008.

Alpine Field Simultaneous Inversion
RockTrace
Simultaneous angle dependent inversion (SADI) was performed on three angle stacks from the Alpine Field. Additionally, post-stack inversion was carried out on the near angle stack (using P-impedance log data) and on the far angle stack (using elastic impedance). The results of the work helped interpreters better characterize the distribution of the reservoir in the field and was used to facilitate well planning and reserves estimation.
Badachhape, A.R., Therry, D.R., Swan, H.W. and Moothart, S.R. [2004] Alpine Field Simultaneous Angle Dependent Inversion. Offshore Technology Conference, Houston, Texas, 3 - 6 May, 2004. OTC 16727.

AVA sensitivity analysis and inversion to delineate a carbonate-siliciclastic reservoir in Venezuela
RockTrace
A detailed AVA sensitivity analysis was conducted to assess the nature of AVA effects in the study area. Such study included cross-plot analysis, Biot-Gassmann fluid substitution, AVA reflectivity modeling, and numerical simulation of synthetic gathers.
Contreras, A. and Torres-Verdín, C. [2004] AVA sensitivity analysis and inversion of 3D pre-stack seismic data to delineate a mixed carbonate-siliciclastic reservoir in the Barinas -Apure Basin, Venezuela. Not published externally.

Combined Reservoir Characterization and Modeling
StatMod MC
This paper presents a combined reservoir characterization and modeling workflow for a producing field in the southern Persian Gulf. A cornerstone of the process is tight integration of geostatistical inversion with the upscaling and geocellular model construction.
Simono, R.B., Mashayekhi, M.J., Morton, R., Crookall, P., Vos, B. and van der Made, P. [2004] Combined Reservoir Characterization and Modeling. EAGE 66th Conference & Exhibition — Paris, France, 7 - 10 June 2004. A014.

Keeping a Giant on its Feet. Dedicated Geophysics Assists Britannia Field Development
RockTrace
Development drilling at Britannia has until recently targeted what were perceived as lower geologic-risk areas around the subsea and platform drilling centres. A major challenge is to evaluate the development potential of the outlying areas away from these primary production facilities.
Burrows, A., Criddle, D., Kaiser, K., Colleran, J. and Angheluta, C. [2004]. Keeping a Giant on its Feet. Dedicated Geophysics Assists Britannia Field Development. Aberdeen October Evening Meeting October 19, 2004.

Production Assessment of Reservoir Models Constructed with 3D Seismic Data
RockMod
This paper describes a study undertaken to appraise spatially complex hydrocarbon reservoir models constructed with the use of 3D post-stack seismic data and well logs.
- Gambus, M. and Torres-Verdin, C. [2004] Production Assessment of Reservoir Models Constructed with the Use of 3D Seismic Data. EAGE 66th Conference and Exhibition - Paris, France, 7 - 10 June, 2004. A016.

Quantifying Uncertainty in Reservoir Properties Using Geostatistical Inversion at the Holstein Field, Deepwater Gulf of Mexico
StatMod MC
We discuss how geostatistical inversion results allowed new methods of computing seismic net pay and net-to gross into our toolkit, delivered a better match to geologic models through higher resolution and added value by providing the flexibility of evaluating different probabilistic scenarios.
Sullivan, C., Ekstrand, E., Byrd, T., Bruce, D., Bogaards, M., Boese, R. and Mesdag, P. [2004] Quantifying Uncertainty in Reservoir Properties Using Geostatistical Inversion at the Holstein Field, Deepwater Gulf of Mexico. SEG Int'l Exposition and 74th Annual Meeting, Denver, Colorado * 10-15 October 2004

Reservoir Characterisation of the Flag Sandstone Using Integrated AVO Inversion
RockTrace
An integrated, multiparameter seismic AVO inversion technique was utilised that improved the mapping of the Flag Sandstone and identified the presence of trapped hydrocarbons.
Jarvis, K., Folkers, A. and Mesdag, P. [2004] Reservoir Characterisation of the Flag Sandstone, Barrow Sub-basin, Using an Integrated, Multi-Parameter Seismic AVO Inversion Technique. ASEG 17th Geophysical Conference and Exhibition, Sydney 2004 Extended Abstracts.

Reservoir Characterization and Modeling of Thin Beds in a Deep Water Gas Field, Offshore India
StatMod MC, EarthModel FT, RockScale
This paper focuses on the inclusion of the finely laminated sands through the integration of high resolution petrophysical data with seismic data. This integration of data with very different vertical resolutions was achieved through rock physics modeling.
Bastia, R., Das, B., Acharya, M., Gabriels, P., Sams, M. and Mesdag P. [2004] Reservoir Characterization and Modeling of Thin Beds in a Deep Water Gas Field, Offshore India. Not published externally.

Seismic Facies Analysis for Fluvial Depositions Characterization, the Fergana Valley Example
RockTrace
To illustrate such seismic facies analysis this paper presents the results of a study of the deep oil and gas field in the Fergana Valley, a mega-syncline inside of the Tyan-Shan zone, Uzbekistan.
Babadzhanov, T.L., Larijani, R., Shilov, G., Ahverdiev, À. and Rykov, À. [2004] Seismic Facies Analysis for Fluvial Depositions Characterization, the Fergana Valley Example. EAGE 66th Conference & Exhibition — Paris, France, 7 - 10 June 2004. A012.

A Comparison Between Geostatistical Inversion and Conventional Geostatistical Simulation Practices
RockMod
Geostatistical inversion provides a quantitative way to integrate the high vertical resolution of well logs with the dense aerial coverage of post-stack three-dimensional seismic data. A systematic field study is presented in this chapter to understand the relative merits of geostatistical inversion over standard geostatistical simulation procedures that do not make explicit use of three-dimensional seismic data.
- Torres-Verdin, C., Grijalba-Cuenca, A. and Debeye, H. [2003] A Comparison Between Geostatistical Inversion and Conventional Geostatistical Simulation Practices for Reservoir Delineation. Submitted to AAPG.

Geostatistical Inversion for the Lateral Delineation of Thin-Layer Hydrocarbon Reservoirs
StatMod MC
This paper reports on the experience gained with a pilot project aimed at quantifying the value of geostatistical inversion for the detection and delineation of thinly bedded hydrocarbon reservoirs.
Miletti, G., and Hlebszevitsch, J. and Torres-Verdin, C. [2003] Geostatistical Inversion for the Lateral Delineation of Thin-Layer Hydrocarbon Reservoir: A Case Study in San Jorge Basin, Argentina. Not published externally.

Impedance Inversion in a Structurally Complex Carbonate Environment
InverTrace
Post-stack seismic inversion to acoustic impedance was successfully performed on a 3D seismic volume over a large carbonate field using an integrated iterative inversion workflow.
Soroka, W.L., Shoemaker, M. and Gombo, A.M. [2003] Impedance Inversion in a Structurally Complex Carbonate Environment, Abu Dhabi, UAE Case Study. SEG International Exposition and Seventy-Third Annual Meeting.

Integrated AVO Reservoir Characterization and Time-Lapse Analysis of the Widuri Field
RockTrace-4D
To investigate and characterize fluid movement, a novel workflow involving joint simultaneous inversion of baseline and monitor seismic AVO data was applied. The results from the time lapse AVO inversion confirm the hypothesis based on production history analysis that aquifer support comes from the southeast.
Mesdag, P., van Eykenhof, R., Harmony, B., Harvidya, L., Sams, M. and van Riel, P. [2003] Integrated AVO Reservoir Characterization and Time-Lapse Analysis of the Widuri Field. EAGE 65th Conference & Exhibition — Stavanger, Norway, 2 - 5 June 2003. A-19.

Porosity and lithology prediction in the Puerto Colón Oil Field in Putumayo (Colombia)
RockTrace
This study presents the results of a seismic inversion analysis and interpretation of the Acae-3D seismic volume.
Acevedo, H., and Pennington, W.D. [2003] Porosity and lithology prediction at Caballos Formation in the Puerto Colón Oil Field in Putumayo (Colombia). The Leading Edge, November, 2003, p. 1135 - 1141.

Seismic Elastic Inversion of a Cretaceous Oil field in the Campos Basin, Brazil
RockTrace
One of the main difficulties of the interpretation in this field was to distinguish the porous sandstones from the low velocity shales. Log analysis indicated separating the two lithologies would be possible. Volumes of P and S wave impedances were generated and elastic parameters derived alowed better quality reservoir characterization.
Thedy, E.A., Grell, A.P., Schwedersky-Neto, G. and Thom, J. [2003] Seismic Elastic Inversion of a Cretaceous Oil field in the Campos Basin, Brazil. 8th International Congress of The Brazilian Geophysical Society, Rio de Janiero, Brazil, 14 - 18 September, 2003.

Time-Lapse Simultaneous AVO Inversion of the Widuri Field, Offshore SouthEast Sumatra
RockTrace-4D
To investigate and characterize fluid movement, a novel workflow involving joint simultaneous inversion of baseline and monitor seismic AVO data was applied. The results from the time lapse AVO inversion confirm the hypothesis based on production history analysis that aquifer support comes from the southeast.
Harmony, B., Van Eykenhof, R., Harvidya, L., Rubyanto, R., Supardi, S.R., Sams, M.S., Alkatiri, F., van Riel, P. and Mesdag, P. [2003] Time-Lapse Simultaneous AVO Inversion of the Widuri Field, Offshore SouthEast Sumatra. Proceedings, Indonesian Petroleum Association, Twenty-Ninth Annual Convention & Exhibition, October 2003. IPA-G-113.

Acoustic Impedance Interpretation for Sand Distribution Adjacent to a Rift Boundary Fault
InverTrace
This article reports on a seismic inverse modeling study from an oil-producing field in the Suphan Buri basin, Thailand.
Ronghe, S. and Surarat, K. [2002] Acoustic Impedance Interpretation for Sand Distribution Adjacent to a Rift Boundary Fault, Suphan Buri Basin, Thailand. AAPG Bulletin, v. 86, No. 10 (October, 2002), pp. 1753 - 1771.

Development of a High Resolution 3D Reservoir Flow Model of the Bierwang Gas Storage Field
InverTrace
To obtain a better understanding of the storage performance of the field, Ruhrgas acquired 3D seismic data and has undertaken a full field integrated geostatistical modeling study to obtain high resolution reservoir flow models. These models form the basis for dynamic modeling.
Hoellwart, J., Haberland, J., van Delden, S., Kloas, F., Peveraro, R., Larijani, R., Charreyron, Y., Sementsov, A., Tijink, P., Lindeman F. and van Riel, P. [2002] Development of a High Resolution 3D Reservoir Flow Model of the Bierwang Gas Storage Field. EAGE 64th Conference & Exhibition — Florence, Italy, 27 - 30 May 2002. H-13.

Estimation of Net-to-Gross from P and S Impedance in Deepwater Turbidites
RockTrace
The limitations of using low-frequency 3-D seismic data for detailed reservoir characterization are well recognized. Nonetheless, these data are very well suited for quantitative estimates of the net-to-gross, which is a reservoir scale property critical in deepwater turbidite reservoir characterization and development projects.
Vernik L., Fisher, D. and Bahret, S. [2002] Estimation of Net-to-Gross from P and S Impedance in Deepwater Turbidites. Thje Leading Edge, April 2002.

Fluid and Lithology Identification Using Simultaneous Angle Dependent Inversion, Burgos Basin, Mexico
RockTrace
This work presents the results of the simultaneous angle dependant seismic inversion applied to identify and delineate gas charged reservoirs in the study area, Burgos Basin, Mexico. This methodology, along with the hydrocarbon system analysis, substantially reduces the risk of exploratory and development well locations.
Mercado, V.H., Uribe, R..M., Méndez de León, C., J., Francucci, E., Fernández-Seveso, F., Piccioni, L. and Graham D. [2002] Fluid and Lithology Identification Using Simultaneous Angle Dependent Inversion, Burgos Basin, Mexico. Not published externally.

From seismic to simulator through geostatistical inversion: Makarem gas accumulation
JasonSTS
This paper presents an applied workflow and the results of an integrated team effort to define the commercially recoverable reserves associated with the Buah fractured carbonate reservoir of the Makarem sour-gas accumulation in the Sultanate of Oman.
Shanor, G., Rawanchaikul, M., Sams, M., Muggli, R., Tiley, G. and Ghulam, J. [2002] From seismic to simulator through geostatistical modelling and inversion: Makarem gas accumulation, Sultanate of Oman. First Break Volume 20.2, February 2002.

Integrated Seismic and Subsurface Characterization of Bonga Field, Offshore Nigeria
RockTrace
The development of Bonga Field is presented as an example of integrated subsurface modeling of complex, deepwater channel reservoirs in which geophysical techniques are highlighted. Three main static reservoir parameters were modeled in detail: net sand distribution, subseismic
Chapin, M., Swinburn, P., van der Weiden, R., Skaloud, D., Adesanya, S., Stevens, D., Varley, C., Wilkie, J., Brentjens, E. and Blaauw, M. [2002] Integrated Seismic and Subsurface Characterization of Bonga Field, Offshore Nigeria. the Leading Edge, November, 2002, 1125 - 1131.

Geostatistical Lithology Modeling
StatMod MC
Using geostatistics to combine seismic and geological information for generation of detailed litholgy models.
- Sams, M.S. [2001] Geostatistical Lithology Modeling. ASEG 15th Geophysical Conference and Exhibition, August 2001, Brisbane, Extended Abstracts.

Adding Value to Impedance Models Through Sequence Stratigraphy
InverTrace
A case study from a maturing oil field shows how integrating data within a common sequence stratigraphic framework approach can lead to the improved understanding of the distribution of fluids and reservoir properties.
Marzuki, Z., Sams, M.S. and Atkins, D. [2001] Adding Value to Impedance Models Through Sequence Stratigraphy. 2001 SPE Annual Technical Conference and Exhibition held in New Orleans, Louisiana, 30 September–3 October 2001. SPE 71350.

Chestnut Well Planning using Elastic Impedance of 4C Seismic Data
RockTrace-PS
The difficulty in appraising the Chestnut Field is due to a lack of acoustic impedance contrast between the oil-bearing Nauchlan Sandstone and the enveloping Shales, rendering it almost transparent to conventional P-wave seismic data gathered via a towed streamer.
Stearn, J.E.F., Castoro, A. and Backhouse, R. [2001] Chestnut Well Planning using Elastic Impedance of 4C Seismic Data. EAGE 63rd Conference & Technical Exhibition — Amsterdam, The Netherlands, 11 - 15 June 2001. Z-99.

Multi-Offset Stack Inversion for Reservoir Delineation and Porosity Estimation: Gulf of Guinea Example
RockTrace
Amplitude inversion is widely used to enhance seismic resolution and discriminate reservoir from non-reservoir by applying a cut-off on the computed impedance.
Dubucq, D., Busman, S. and van Riel, P. [2001] Turbidite Reservoir Characterization: Multi-Offset Stack Inversion for Reservoir Delineation and Porosity Estimation: a Gulf of Guinea Example. Not externally published.

Seismic Inversion - The best tool for reservoir characterization
InverTrace, RockTrace
In various forms, seismic inversion has been around as a viable exploration tool for about 25 years. This article briefly discusses inversion techniques in a somewhat qualitative manner, keeping the equations to a minimum. After all, it is drilling results which count and against which any algorithm will ultimately be measured.
- Pendrel, J.V. [2001] Seismic Inversion - The best tool for reservoir characterization. CSEG Feature Article, 2001.

Sequence Stratigraphy and Seismic Impedance: A New Approach to Reservoir Characterization
RockTrace
In reservoir characterisation we strive to develop a unified model of the reservoir that integrates the available seismic, well log, geologic and engineering data. Such models are best derived in the context of a sequence stratigraphic framework.
- Atkins, D.R., Wilson, M., and Sams, M.S. [2001] Sequence Stratigraphy and Seismic Impedance: A New Approach to Reservoir Characterization. EAGE 63rd Annual Conference & Technical Exhibiton - Amsterdam, The Netherlands, 11 - 15 June 2001.

Improving the Static Model of a Complex Reservoir through the Inversion of Seismic Data
InverTrace, StatMod MC, EarthModel
A number of static models that include the seismic data and those based on log data alone have been compared for an oil field from the Malay basin. Significant differences in volumetric estimates were found. These differences were caused by the variations in sand quality across the field that were misrepresented when the seismic data were not used.
Marzuki, Z.B., Sams, M.S. and Atkins, D. [2001] Improving the Static Model of a Complex Reservoir through the Inversion of Seismic Data. SPE International Oil and Gas Conference and Exhibition in China held in Beijing, China, 7–10 November 2000. SPE 64740.

4C Seismic Data and Reservoir Modeling at Alba Field, North Sea
RockTrace
In this paper, we first overview the data, techniques, and studies used to justify the 3-D OBC survey. Next, we present images of the new OBC and reprocessed streamer seismic data that show 4-D, AVO, and converted-wave results. Finally, we suggest a new, preliminary interpretation of the Alba reservoir that is supported by two recently drilled wells.
Hanson, R., MacLeod, M., Bell, C., Behrens, R. and van Riel, P. [2000] 4C Seismic Data and Reservoir Modeling at Alba Field, North Sea. Not externally published.

Alpine Oil Field: Geophysics from Wildcat to Development
RockTrace
The Alpine Oil Field will begin production during the third quarter 2000. The exploration and subsequent development efforts have relied heavily on several geophysical methods and integrating these data with the geological and engineering data sets. Several of these methods and their impact on the exploration and development effort will be reviewed.
Gingrich, D., Hughes, D., Martindale, K., Savic, M., Sena, A., Kerr, D., Hannon R., and Knock, D. [2000] Alpine Oil Field: Geophysics from Wildcat to Development. SEG 2000 Expanded Abstracts.

An Interpreters Guide to Understanding and Working with Seismic-Derived Acoustic Impedance Data
InverTrace
Inversion of seismic data into acoustic impedance (AI) is a rapidly growing field, due primarily to the ease and accuracy of interpretation of the impedance data.
- Latimer, R.B., Davison, R., and van Riel, P. [2000] An Interpreters Guide to Understanding and Working with Seismic-Derived Acoustic Impedance Data. The Leading Edge, March 2000, 242 - 256.

Comparison of constrained sparse spike and stochastic inversion for porosity prediction at Kristin Field
InverTrace, StatMod MC
Kristin Field is a recently discovered gas and condensate field offshore Norway. Reservoir sandstones are tidally influenced, laterally continuous shallow marine deposits of Jurassic age. This paper presents two methods for porosity modeling of Ile Formation: 1) universal kriging with inverted impedances as a trend (CSSI method) 2) stochastic simulation constrained by seismic data (stochastic inversion method)
Helgesen, J., Magnus, I., Prosser, P., Saigal, G., Aamodt, G. and Busman, S. [2000] Comparison of constrained sparse spike and stochastic inversion for porosity prediction at Kristin Field. The Leading Edge, April, 2000, 400 - 407.

Interpretation of P- and S-Impedance from Simultaneous Inversion
RockTrace
Seismic amplitude variation with offset holds information on density and two elastic parameters: compressional and shear velocities (or impedances). We simultaneously invert multiple offset stacks to transform P-wave offset seismic reflection data to these parameters. Using the simultaneous inversion results, we are able to achieve the desired discrimination by exploiting the contrast in sandstone-shale rigidity.
Pendrel, J., Debeye, H., Pedersen-Tatalovic, R., Bogaards, M., Goodway, B., Dufour, J. and Stewart R.R. [2000] Estimation and Interpretation of P and S Impedance from Simultaneous Inversion of P-wave Offset Seismic Data. Not externally published.

Quantifying Fluid Prediction Using Angle-Dependent Inversion Measured Against Log Fluid Substitutions
RockTrace
A Bright spot prospect was identified using 2D and 3D seismic. Due to the isolation of this prospect from existing infrastructure it is critical to be able to predict the type of hydrocarbon likely to be present.
- Anderson, J.W. and Bogaards, M.A. [2000] Quantifying Fluid Prediction Using Angle-Dependent Inversion Measured Against Log Fluid Substitutions. Submitted to 2000 Offshore Technology Conference, Houston, Texas. OTC 11908

Simultaneous Inversion of the Ladybug Prospect and Derivation of a Lithotype Volume
RockTrace
It was determined that the Simultaneous Inversion methodology extracts a more dynamic range of information from offset seismic stacks, and results in an improved response to reservoir identification and mapping over that of traditional seismic AVO analysis.
Jim Fowler* and Mark Bogaards, Jason Geosystems; Gale Jenkins, Texaco Worldwide Exploration and Production, Inc.

Stochastic Inversion for High Resolution Reservoir Characterisation in the Central Sumatra Basin
StatMod MC
Stochastic inversion with lithology simulation is a powerful tool for integrating a wide variety of data - geological, geophysical, petrophysical and statistical - to produce constrained, detailed models of reservoirs. These models can be used for static or dynamic modelling. The technique is well suited to mature fields such as those in the Central Sumatra Basin, where the objectives are to find bypassed reserves and optimise well planning for secondary or tertiary recovery.
M.S. Sams, Jason Geosystems Asia, D. Atkins, Jason Geosystems Asia, N. Said, P.T. Caltex Pacific Indonesia, E. Parwito, P.T. Caltex Pacific Indonesia, P. van Riel, Jason Geosystems bv

Offset Inversion of Blackfoot P-Wave Data and Discrimination of Sandstone and Shales
RockTrace
In the lower cretaceous glauconitic and regional incised valleys of southern Alberta, Canada, valleys can be filled with sands and/or shales of similar acoustic impedance. Angle-dependent inversion assists in discriminating facies types and compensates for angle-dependent tuning, scaling, and phase in the seismic data.
John Pendrel, Robert Stewart, Jocelyn Dufour, Bill Goodway, and Paul van Riel

Multi-Component Seismic Interpretation: Data Integration issues, Alba Field, North Sea
RockTrace-PS
This paper focuses on the use of multicomponent seismic data for improved structural imaging of the Alba field.
R. Hanson*, M. MacLeod, and C. Bell, Chevron U.K. Ltd, C. Thompson, Chevron Petroleum Technology Company (presently with Norsk Chevron A/S), J. Somod, Saga Petroleum U.K. Ltd.

The Alba Field Ocean Bottom Cable Seismic Survey: Impact on Development
RockTrace-PS
With the first well being drilled less than a year after seismic acquisition started, the new data arrived in time to make a significant commercial impact on the field’s development. We hope our results at Alba will cause further development and more widespread use of this exciting new technology.
M. K. MACLEOD, R. A. HANSON, and C. R. BELL, Chevron UK Ltd., Aberdeen, Scotland, S. MCHUGO, Schlumberger Oil Field Services, Gatwick, England

Interpreting Sand Channels from 3C-3D Seismic Inversions
RockTrace-PS
Shear waves can provide vital lithologic information, especially in combination with traditional P-wave seismic data or when P-wave sections contain ambiguities.
JOHN PENDREL1, ROBERT R. STEWART2 and PAUL van RIEL3

Methodology for Seismic Inversion and Modeling: A Western Canadian Reef Example
InverTrace, EarthModel
Modern seismic inversion methods model both wavelet amplitude and phase effects and offer the opportunity for improved resolution and presentation of data in a form immediately recognizable to both geophysicists and geologists. This has re-focused our attention to the problem of non-uniqueness. Since the bandwidth of the seismic data is finite, there can be more than one mathematical solution to the seismic inversion problem. It has therefore become our task to differentiate between similar mathematical solutions on the basis of their geophysical and geological viability.
John Pendrel and Paul van Riel

Effect of Well Control on Constrained Sparse Spike Seismic Inversion: A Western Canadian Reef Example
InverTrace
Modern seismic inversion methods transform seismic reflection data to pseudo acoustic impedance logs. Inherent in this approach is an integration of low frequency model information with higher frequencies from the seismic.
Pendrel, J. and van Riel, P. [1997] Effect of Well Control on Constrained Sparse Spike Seismic Inversion: A Western Canadian Reef Example. Not externally Published.

Seismic Inversion for reservoir characterization and well planning in the Snorre Field

The impedance values of the non-reservoir lithologies significantly overlap those of the reservoir sands, causing problems in the use of impedance to predict reservoir sands. Jason Geosystem (with support from Statoil, Norsk Hydro, and Saga Petroleum) created a new inversion scheme (InverMod) to overcome this challenge.
DAG HELLAND-HANSEN, INRID MAGNUS, ATLE EDVARDSEN, and EGIL HANSEN, Saga Petroleum ASA, Sandvika, Norway

Integrated Seismic Reservoir Characterization and Modeling: A Gulf of Mexico 3D Case History
InverTrace
Following a quantitative workflow through a Gulf of Mexico 3D case study shows how the reservoir’s stratigraphic and lithologic properties are more accurately determined than would be possible with standard seismic interpretation and seismic attribute analysis.
Latimer, R.B. and van Riel, P. [1996] Integrated Seismic Reservoir Characterization and Modeling: A Gulf of Mexico 3D Case History. Gulf Coast Section, Society for Sedimentary Geology.

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