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AAPG Bulletin

Abstract

AAPG Bulletin, V. 90, No. 12 (December 2006), P. 1869-1882.

Copyright copy2006. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/06140605099

Sequence-stratigraphic analysis using well Previous HitcuttingsNext Hit, Mississippian Greenbrier Group, West Virginia

Thomas C. Wynn,1 J. Fred Read2

1Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061; present address: Department of Geology and Physics, Lock Haven University, Lock Haven, Pennsylvania 17745; [email protected]
2Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061

ABSTRACT

Well-Previous HitcuttingsNext Hit analysis predates modern carbonate facies analysis, sequence stratigraphy, seismic reflection surveys, and advanced geophysical logging techniques. These newer methods have resulted in well Previous HitcuttingsNext Hit becoming less important as a major source of data for high-resolution subsurface analysis. Binocular analysis of well-indurated Paleozoic well Previous HitcuttingsNext Hit can be used to construct detailed vertical facies successions in wells when tied to wire-line logs. Facies analysis can then be used to construct higher resolution sequence-stratigraphic frameworks and time-slice maps. This approach was tested on Mississippian carbonates in the Appalachian Basin of West Virginia. The analysis was done using the washed coarse fraction (1–2 mm; 0.04–0.08 in.) of the Previous HitcuttingsNext Hit for each sample interval, classified according to Dunham rock type, counted to determine relative abundance, and plotted as percent lithology versus depth for each well. Digitized wire-line logs and the Previous HitcuttingsNext Hit-percent logs were adjusted (typically 10 ft [3 m] or so) to consider drilling lag, lithologic columns were produced Previous HitfromNext Hit the combined data, and sequences were picked. Gamma-ray markers were used to correlate the sections, and sequence-stratigraphic cross sections were produced. Time-slice maps were generated that show the thickness of the individual sequences and the distribution of major facies within systems tracts. This approach generated a rock-based, high-resolution sequence framework for the reservoir and led to a much better understanding of controls on the distribution and stacking of reservoirs.

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