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Abstract
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Chapter from: SG
42: Applications of 3-D Seismic Data to Exploration and Production
Edited by:
Paul Weimer and Thomas L. David Authors:
Kathleen O. Horkowitz and David R. Davis
Published 1996 as
part of Studies in Geology 42
Copyright © 1996 The American Association of Petroleum
Geologists. All Rights Reserved.
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*Editorial Note: Page numbers in this digital version
(HTML and PDF) do not correspond to those of the hardcopy.
Otherwise, the two are the same.
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CHAPTER
4
Chapter 4: Seismic
Delineation of Thin Sandstone Reservoirs in a Shale-Rich Sequence Using
Instantaneous Frequency and Reflection Amplitude Attributes from 3-D Data,
Texas Gulf Coast Kathleen O. Horkowitz* and David R.
Davis** |
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Horkowitz, K.
O., and D. R. Davis, Seismic delineation of thin sandstone reservoirs in
a shale-rich sequence using instantaneous frequency and reflection amplitude
attributes from 3-D data, Texas Gulf Coast, in P. Weimer and T. L. Davis,
eds., AAPG Studies in Geology No. 42 and SEG Geophysical Developments Series
No. 5, AAPG/SEG, Tulsa, p. 35-44. |
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ABSTRACT
A combination of seismic
trace attributes including instantaneous frequency and reflection amplitude
was successfully used to seismically delineate gas-prone reservoir facies
consisting of thin, discontinuous sandstone reservoirs in a shale-rich
stratigraphic sequence. This type of reservoir section poses special problems
for seismic interpretation due to a high degree of lateral and vertical
variation in the ratio of net sandstone to gross interval thickness. Individual
sandstone reservoirs are also below the limit of seismic bed resolution,
further complicating the evaluation.
Instantaneous frequency maps
were used directly to map the areal distribution of reservoir-prone intervals.
The addition of calibrated average amplitude maps provided the ability
to discriminate between homogenous shale-rich sections and relatively homogenous
sandstone-rich sections characterized by amalgamated siltstones and sandstones.
The lithofacies prediction model developed using this integrated geological,
petrophysical, and seismic interpretation technique was confirmed by the
results of two new wells which penetrated the target interval described
in this study. Instantaneous frequency maps with overlays of amplitude
and time structure contours successfully identified stratigraphic intervals
favorable for gas accumulation and trapping.
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