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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Balanced Cross Section Through
Wilburton Gas Field,
Latimer County, Oklahoma:
Implications for Ouachita Deformation
and Arbuckle (Cambro-Ordovician)
Exploration in Arkoma Basin
By
A computer-balanced regional cross section allows
several new interpretations for the structural development
of Wilburton gas field. The gas-productive deep Arbuckle
structure is interpreted to be in the hanging wall of a high-angle,
south-dipping reverse fault
. This
fault
may be a
reactivated normal
fault
based on Pennsylvanian lower
Atokan thickness changes and by analogy to comparable
extensional faults to the north. Overlying the Arbuckle
fault
block is an imbricated thrust sheet containing Pennsylvanian
Spiro and Cromwell sandstone reservoirs where gas production
has been established from both the hanging wall and
footwall
fault
blocks. The main thrust originates from a
detachment zone within Mississippian shales to the south
and ramps over the deeper Arbuckle
fault
block along the
southern margin of the field. Minimum horizontal displacement
of the hanging wall Spiro cutoff is 3.5 miles (5.6 km).
This estimate is significantly smaller than that shown by
previously published sections through the area, yet is still
too large to be adequately accommodated by blind thrusting
north of Wilburton field. Well and surface data indicate that
much of the displacement instead may have been accommodated
by north-dipping backthrusts. Although poorly constrained,
at least some
fault
movement on the Arbuckle
reverse
fault
appears to postdate the overlying thrust-faulted
structures.
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