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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Recent Wolfcamp Carbonate Oil Reservoir Discoveries
Utilizing 3-D
Seismic
Data
in the Midland Basin of West Texas *
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Currently two of the successful oil
plays of the Permian Basin involve the
precision delineation of Wolfcamp oil
reservoirs at depths of 8000' to 9000'.
This delineation is being accomplished
utilizing 3-D seismic
data
along with
detailed subsurface
data
interpretation
.
One of these stratigraphic plays is situated
in Western Upton County, Texas and
the other one is located in Glasscock
County, Texas. Both plays are for oil
trapped in closed system carbonate
detrital reservoir pods distributed along
slope to basin transitional trends.
Seismic
signature analysis is a key aspect
of successful exploration in each of
these plays.
Some of the 1992 and 1993 oil wells
completed in the above two plays will be
highlighted, along with the methods
leading to these successes. Success rates
for wildcat risk wells in the sprawling
Triumph Field of Upton County are better
than 80%. A typical 1992 Triumph
"Field" well was potential tested flowing
approximately 500 BOPD, plus 500
MCFG. Successful completion rates
prior to 3D seismic
data
interpretation
are estimated to be approximately 15%
or less. Chevron is the major operator
and innovator in this play.
In the Glasscock County Wolfcamp
play, the incorporation of 3-D seismic
data
interpretation
has boosted the successful
oil well completion rate from less
than 15% (prior to 3D) to more than
70%. Trend Exploration, the current
major operator in this play, and Matador
Drilling Co., have successfully completed
10 of 14 Wolfcamp oil wells drilled, following
a 16 mile 3D
seismic
survey. In
this play, Trend's best initial potential
was more than 1700 BOPD but a typical
well was completed flowing approximately 500 BOPD.
A cross-section demonstrates the limited
aerial extent and thick net pay character
of one of Trend's most spectacular
completions. The 13D Powell "2" was
completed flowing 1111 BOPD in December 1992. It was surrounded by dry holes.
One of these dry holes was located only 600 ft.; to the southwest. The
cross-section shows the channeled fan nature of the reservoir and demonstrates
the need for precision prospect delineation prior to drilling. Trend's wells
have been completed in the Cobra, Powell and Blalock Lake South Fields: however,
data
presented illustrate the wildcat nature of each field well.
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