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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
Structure, stratigraphy, and hydrocarbon
system of a Pennsylvanian pull-apart basin in north-
central
Texas
central TexasBrian S. Brister,1
William C. Stephens,2 Gregg A.
Norman3
1New Mexico Bureau of Geology and
Mineral Resources, New Mexico Institute of Mining and Technology,
Socorro, New Mexico, 87801; email: [email protected]
2Gunn Oil Company, PO Box 97508, Wichita Falls, Texas,
76307-7508; email: [email protected]
3Gunn Oil Company, PO Box 97508, Wichita Falls, Texas,
76307-7508; email: [email protected]
AUTHORS
Brian S. Brister received his Ph.D. in 1990 from the New Mexico Institute of Mining and Technology. From 1990 to 1998, he was an exploration geologist in the Texas and Rocky Mountain regions for Burnett Oil Co., Inc., Fort Worth, Texas. Currently, he is a research petroleum geologist conducting characterization studies of low-permeability gas reservoirs and related hydrocarbon systems.
William C. Stephens received his B.S. degree in geology from Virginia Polytechnic Institute in 1980. He has been an exploration and development geologist with Gunn Oil Company for 20 years. His primary focus is on the application of sequence stratigraphy and petroleum systems concepts to the exploration of the Pennsylvanian System in north Texas.
Gregg Norman earned his B.S. degree in geology from Midwestern State University in 1987. He has been employed by Gunn Oil Company since 1987 as an exploration and development geologist focusing on north and west Texas. His current areas of interest and research include sequence stratigraphy and petroleum systems of the eastern Permian basin of Texas.
ACKNOWLEDGMENTS
We thank Gunn Oil Company and Burnett Oil Co., Inc. for their support. We appreciate the many people who contributed ideas, data, and reviews, notably R. D. Gunn, J. W. Mason, R. R. Ray, P. Renick, D. S. Stone, T. E. Ewing, and L. T. Billingsley. The New Mexico Bureau of Geology and Mineral Resources provided a supportive environment for research and completion of this article, including drafting by Leo Gabaldon.
ABSTRACT
In 1989, a deep test in Cottle County,
Texas, discovered an anomalously thick, gas-charged Pennsylvanian
(lower Bend Group) clastic section along the Matador arch. Subsequent
exploration and development provided data that support the concept
that the natural gas fields in Cottle and King counties, north-central
Texas, mark the extent of a hydrocarbon system related to the
Broken Bone graben, an elongate 180 km2 pull-apart
basin in southeastern Cottle County. The graben results from left-step
overstepping of left-lateral fault zones and is a component of
the Red River-Matador structural trend of the greater Ancestral
Rocky Mountains. Arkosic detritus originating from the Amarillo-Wichita
uplift was transported southward, over the region containing the
graben, toward the Knox-Baylor trough. Episodic graben subsidence
accommodated a part of this sediment load as syntectonic, cyclically
stacked Bend Group (Atokan, lower Pennsylvanian) fluvial-deltaic
to marine deposits. Organic facies within the graben fill are
predominantly terrestrially derived (gas prone) and present in
sufficient quantity for significant hydrocarbon generation. Lopatin
method basin modeling, vitrinite reflectance (Ro) measurements,
and Ro-calibrated pyrolysis-derived maturity measures
demonstrate that the Bend Group organic facies in the graben
have
approached peak gas-generating maturation levels. Generated gas
migrated within and outside of the basin following nonsealing
faults and channelized fluvial pathways into several reservoir
rock types in combination structural and stratigraphic traps.
(Begin page 2)
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