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The AAPG/Datapages Combined Publications Database
Fort Worth Geological Society
Abstract
ABSTRACT:
Structural
Geometry of
Thrust Faulting in the Hartshorne area of Frontal Ouachitas, Arkoma Basin,
Oklahoma
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By
School of Geology, Oklahoma State University, Stillwater, OK 74078
The Ouachita Mountains and Arkoma basin are two related tectonic provinces formed during the Late Paleozoic Ouachita Orogeny. The Arkoma basin consists of gentle synclines and thrust-cored anticlines. The frontal Ouachitas are characterized by imbricate thrusts and complex fold geometries.
This study is concerned with the structural
geometry of
thrusting within the Hartshorne SW quadrangle in southeastern Oklahoma. The
study area includes the Hartshorne gas field where gas production ranges from
five bcf in 17 months (middle Atoka from Agnes #1 well) to numerous dry holes.
Five balanced structural
cross
-
sections
are being constructed
to determine the geometry of the Late Paleozoic thrust system. Data from the
surface geological
maps
by the Oklahoma Geological Survey, wire-line well logs,
scout tickets, and seismic profiles, from BPAmoco and ExxonMobil Corporations
are used to construct the
cross
-
sections
. Upon their completion, the
cross
-
sections
will be restored to determine the amount of shortening induced by
thrusting in the area.
The Hartshorne, Red Oak, Panola, Brazil, and Spiro sandstones
are identified as marker beds to construct the cross
-
sections
. We considered the
Spiro to include the Wapanucka and Cromwell formations. Our preliminary interpretation of the available data suggest that a
triangle zone exists between the Carbon Fault to the northwest and the Choctaw
Fault to the southeast. A duplex structure and associated horses appear to exist
above the Woodford and Springer detachments with the Lower Atokan Detachment as
the roof thrust.