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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: A 3-Dimensional Reflection
Seismic
Survey
Over the Dollarhide Field,
Andrews County, Texas


By
A three
-
dimensional
seismic
survey over the Dollarhide
Field, Andrews County, Texas, was collected and analyzed
during August 1988 through December 1989. Discovered in
1945, the field is described as a large faulted anticline. This
presentation describes the design, pre-planning, acquisition
and processing of this survey and the preliminary results of
the
interpretation
.
The primary geophysical purpose of the survey is to accurately image the location of the faulting within the Dollarhide Field to aid in the future planning of enhanced recovery operations.
To design the 3-D survey, information including depth, velocity, maximum dip and reflection data quality are compiled. A subsurface bin size of 110' inline by 110' crossline is determined to sample adequately the subsurface of processing through 3-D migration.
Two
innovations are employed to reduce the costs of
the survey, wide line sampling and simultaneous sweeping.
The wide spacing of the source and receiver lines result in
fewer swaths to collect and fewer surface access costs. In
data processing, the data volume is interpolated to a finer
sampling prior to 3-D migration.
The second cost reduction technique is to use two
sets
of vibrator sources, simultaneously sweeping. The source
separation is accomplished by upsweep-downsweep and
phase rotation - summing, giving greater than 40 bd of signal
separation.
Conventional data processing techniques are applied
to the data volume plus 3-D DMO. 3-D migration then
produces the data volume for interpretation
on a workstation.
The interpretation
of the 3-D data volume yields the
following observations:
- Cross-faulting is much more extensive than geologically
mapped with 40 acre spacing, which directly
impacts the
tertiary recovery program.
- Detailed Devonian structure mapping has pinpointed
at least five new well locations in the Devonian Unit.
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