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PARASEQUENCE-SCALE STRATIGRAPHIC CORRELATIONS IN DEEP-MARINE SEDIMENTS USING BOREHOLE IMAGES

By
NEIL F. HURLEY
NEIL F. HURLEY
Department of Geology and Geological Engineering Colorado School of Mines Golden, Colorado 80401
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Published:
December 01, 1996

ABSTRACT

Modified Fischer plots can be used in subsurface reservoirs for parasequence-scale correlations. Although the technique is applied to deep-marine sediments, it is not restricted to such sediments. The approach is based on high-resolution bedboundary detection using borehole-imaging logs such as FMS (Formation MicroScanner, Trademark of Schlumberger, Inc.), FMI (Formation Microlmager, Trademark of Schlumberger, Inc.), or any of the other electrical or acoustic dipmeter devices. The operator interactively selects dips at the top of every clay-sand and clay-chalk interbed while viewing images on a computer workstation. A spreadsheet is prepared which lists the depths to the top of each selected bed boundary. From all contiguous cycles, one calculates a mean-cycle thickness and the departure of each cycle thickness from the mean. Dimensionless cycle thickness is then calculated by dividing mean-cycle thickness into departure from mean-cycle thickness. Interpretations are made on a cross plot of cycle number (a function of depth) vs. cumulative dimensionless departure from mean cycle thickness. The curve that results has a distinctive shape which is based on changes in cycle thickness. This curve can be used like a well-log trace to correlate cycles between wells, look for missing section, and hypothesize about changes in sea level, channel migration, and lateral continuity of facies.

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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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