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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Abnormal High Pressure
and Environment of Deposition
By
An apparent relationship of the environment of deposition to the occurrence of
abnormal high fluid pressures in a sand-shale sequence of the subsurface South Texas
Oligocene is established. The abnormal high pressures are generally encountered in
the "downdip" facies which consists of deltaic sediments of alternating inner neritic
(includes brackish and near-shore marine) and middle neritic (shallow marine) depositional
environments.
There is an abrupt change in the environment of deposition that seems to coincide
with the top of the abnormal high pressure zone.
This new approach to predicting abnormal high pressured formations can be used
at the well-site.
The key to a better understanding of the problems and the solution to these problems
associated with abnormal high fluid pressures may be found in an understanding of the
depositional environments and history of the sedimentary basin. In order to accomplish
this, there may be a need for more workers to examine surface and subsurface rock
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