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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

By
KATHLEEN O. HORKOWITZ
KATHLEEN O. HORKOWITZ
Resource Analysts 6311 Driftwood Dr. Midland, Texas 79707
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DAVID R. DAVIS
DAVID R. DAVIS
Sanchez-O’Brien Oil and Gas Corporation 5847 San Felipe, Suite 1900 Houston, Texas 77057
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Published:
December 01, 1996

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 shalerich 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 homogeneous shale-rich sections and relatively homogeneous 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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Contents

GCSSEPM

Stratigraphic Analysis Utilizing Advanced Geophysical, Wireline and Borehole Technology for Petroleum Exploration and Production

Jory A. Pacht
Jory A. Pacht
Seis-Strat Servies, Inc. Sugar Land, Texas
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Robert E. Sheriff
Robert E. Sheriff
University of Houston Houston, Texas
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Bob F. Perkins
Bob F. Perkins
GCSSEPM Foundation West Hartland, Connecticut
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SEPM Society for Sedimentary Geology
Volume
17
ISBN electronic:
978-0-9836097-6-6
Publication date:
December 01, 1996

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