Texaco

December 2, 1997

Texaco Exploration's West Africa Team recently had the opportunity to compare acoustic impedance inversion results from a 3D seismic data set in West Africa using Jason's Geoscience Workbench and a competitor's global seismic inversion technique. A large 3D data volume was inverted with the competitor's software, using a single well with variable log quality over the zone of interest. Concurrently, one of Texaco Exploration's partners used Jason's Geoscience Workbench software to invert a small subset of the 3D volume in the immediate vicinity of the well. For this 3D data set, the inversion with the Workbench tools has yielded a product with higher vertical resolution, resulting in a clearer depiction of potential reservoir thicknesses. Spatial resolution of the two products appears to be comparable. Although currently untested by additional drilling, we believe that the inversion with the [Jason Geoscience Workbench®] product has allowed us to more accurately quantify the reserves potential in the area near the well.

Texaco Exploration's West Africa Team is currently employing Jason Geosystems to perform acoustic impedance inversions for additional seismic data sets from West Africa. We look forward to continued high resolution, high quality results using the Jason Geoscience Workbench products.

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