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The Arkoma basin, located in southeast Oklahoma and west-central Arkansas, is a Pennsylvanian basin which produces gas exclusively, primarily from stratigraphic traps in Atokan and Morrowan sandstones. Many analogies can be made with the Gulf Coast basin; low-angle normal faults, growth faults (both large and small), and abundant sand deposition in a shallow-marine environment.
A series of large growth faults separates the shelf from the deep basin. These faults were active during middle Atokan, adding thick additional section to the deep basin. No correlation exists at this time between the shelf and deep basin sandstones in the middle Atokan.
Throughout the Morrowan and Atokan, a series of delta systems developed across the northern shelf of the basin, mainly from the middle Atokan; the Alma, Carpenter 'B,' Morris, Tackett, and Areci sandstones. Although variable in lateral extent, thickness, and location all have a northeast source and a broad lateral distribution along the shelf. Post-Pennsylvanian erosion has removed the upper distributary part of the above delta systems.
All middle Atokan sandstones produce gas from stratigraphic traps within distributary mouth bars, barrier bars, and delta front sands. All are complicated by normal faults.
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