A key problem in interpreting depth-migrated sections (prestack or poststack) is that seismic horizons almost never agree with well tops. Often, seismic events are on the order of 1000 ft deeper. Seismic anisotropy is mostly blamed for the discrepancy. In this paper, we show a case study at the Lodgepole reef play in North Dakota where, by incorporating strong seismic anisotropy in a 3-D velocity model, we can achieve good depth migration results and excellent well ties (within 50 ft). Our estimate of anisotropy parameters agrees with laboratory measurements on core samples.

In 1996 Shell acquired 200 miles2 of...

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