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Differences observed between the two 3-D seismic datasets in the area are described. A 4-D seismic analysis technique was utilized comprising seismic imaging, feature extraction, and pattern recognition functions, coupled iteratively with high resolution, seismic forward and inverse modelling. Pattern recognition, rather than interpolation and recomputation, is used to examine similarities and differences among the seismic amplitudes of the datasets. This technique minimizes difficulties in matching acquisition parameters, variable geometries, and technology improvements. High amplitude regions, analysis of drainage and the seismic model are examined. 10 refs.