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Abstract
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Chapter from: SG42: Applications of 3D Seismic Data to Exploration and Production
Edited by:
Paul Weimer and Thomas L. David Authors:
Jory A. Pacht, Larry Brooks, and  Frank Messa
Pages 238-251
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
17
Chapter 17: Stratigraphic
Analysis of 3-D and 2-D Seismic Data to Delineate Porous Carbonate Debris
Flows in Permian Strata Along the Northwestern Margin of the Midland Basin,
West Texas, U.S.A.
Jory A. Pacht*, Larry BrooksÝ,
and Frank MessaÝ
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Pacht, J. A.,
L. Brooks, and F. Messa, Stratigraphic analysis of 3-D and 2-D seismic
data to delineate porous carbonate debris flows in Permian strata along
the northwestern margin of the Midland Basin, West Texas, U.S.A., 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. 161-170.
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ABSTRACT
Porous carbonate debris
flows are important plays in Leonardian (Permian) strata along the northwestern
margin of the Midland Basin. Delineation of these strata, however, is difficult,
and detailed stratigraphic analysis of both 2-D and 3-D seismic data is
important in reducing risk. Debris flows are common in all carbonate slope
and base-of-slope environments. However, many flows exhibit a muddy matrix
and low permeability. Porous debris flows are best developed during lowstand
time. When sea level fell to a point at or below the shelf margin, sand
to boulder-sized clasts created by reef-front erosion were funneled through
slope gullies onto the base of the slope.
Large debris flows exhibit
well-defined mounds that downlap onto the sequence boundary. Many of these
flows, however, are too thin to exhibit discrete reflections. In the study
area, porous debris flows were distinguished by areas of lower amplitude
and lower average weighted frequency than surrounding strata. The porous
debris flows occurred downdip of major slump scars. Once sequence boundaries
and, where present, mounded reflections that downlap onto them were delineated
on a subregional basis using 2-D data, they were interpreted throughout
a smaller 3-D dataset. Horizon amplitude and average weighted frequency
maps were constructed and used to delineate amplitude and frequency variations
on the basin floor. Time structure and isochron maps were made to locate
associated updip slump scars. |
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