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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: East Taft Field,
San Patricio County, Texas - A Subtle Stratigraphic Trap
By
The shallow Upper Frio producing trend along the
downthrown side of the Vicksburg flexure in the Lower
Texas Gulf Coast is certainly one of the world's supermature
provinces for oil and gas exploration
. Current emphasis in
exploration
must be for the subtle trap, the discovery of
which has been selected against during the many years of
intensive
exploration
. East Taft Field is an excellent example
of one such subtle trap. A stratigraphic oil accumulation in a
barrier bar washover sand, East Taft has produced 2.35
million barrels of oil from 33 wells completed in an average
of only 2.5 ft (0.76 m) of net oil sand. Traps of this type are
numerous all along the trend due to the nature of the barrier
bar and adjacent lagoonal environments. These traps remain
largely undiscovered as they are never specifically explored
for and are often passed over as noncommercial when
penetrated by wells. The economic potential of these subtle
traps is enormous.
Exploration
programs geared specifically
toward finding these reserves can be expected to provide an excellent return on
investment. However, creative geological
thinking and
innovative
engineering practices will be required
to discover and develop these fields profitably. For
the explorationist who is willing to do the detailed structural
and stratigraphic analysis required to identify these prospects,
who understands the risks involved in
exploration
for
these traps, and who is willing to innovate, these subtle
stratigraphic traps truly represent a new frontier in an old
producing province.
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