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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 69 (1985)

Issue: 2. (February)

First Page: 294

Last Page: 294

Title: Wilcox Depth Prediction at Katy Previous HitFieldNext Hit, Waller County, Texas: Problem and Solution: ABSTRACT

Author(s): A. M. Olander

Article Type: Meeting abstract


Velocity anomalies large enough to cause severe errors in depth maps may not be recognized from prior drilling experience, from regional velocity control, or from seismic reflection configurations. A chastening Previous HitexampleNext Hit of one such anomaly is an outpost well near the Katy Previous HitfieldNext Hit in Waller County, Texas. This outpost well, the Exxon 1 Sparks, tested Wilcox sands, which were both dry and 500 ft low to seismic prediction from Vibroseis Previous HitdataNext Hit. The well came in structurally low as a result of incorrect predictions of both near-surface and post-Wilcox velocities. Additional studies indicated that the Sparks well was drilled on the flank of a structure that was later drilled and proved to be the discovery of a new Wilcox Previous HitfieldTop.

Accurate velocities are becoming increasingly important in all phases of oil and gas exploration, particularly in mature exploration areas where prospects are subtle and difficult to find.

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Copyright 1997 American Association of Petroleum Geologists