About This Item
- Full text of this item is not available.
- Abstract PDFAbstract PDF(no subscription required)
Share This Item
The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
Volume:
Issue:
First Page:
Last Page:
Title: Field
, Waller County, Texas: Problem and Solution: ABSTRACT
Author(s):
Article Type:
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 example
of one such anomaly is an outpost well near the Katy
field
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
data
. 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
field
.
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.
End_of_Article - Last_Page 294------------