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The Discovery and Geology of the Potato Hills Gas Field, Latimer and Pushmataha Counties, Oklahoma
Shallow production at the Potato Hills gas field was discovered by the Sinclair #1 Reneau in 1960, completed for 1.33 MMcfgd (110.4M cu-m/d) from Ordovician Bigfork Chert, Figure 1. However, it wasn’t until the completion of the GHK et al #1-33 Ratcliff in September 1998 that a major gas accumulation was recognized. The GHK #1-33 Ratcliff well (c W/2 sec.33 T3N R20E) was completed for 35.77 MMcfgd (1.01MM cu-m/d), from the “Ratcliff Sandstone”, a unit of the Morrowan Jackfork Formation. This paper presents information developed during the GHK Corporation’s development of the Potato Hills Gas Field. The data suggest that Miser, 1929, whose interpretation of a fenster of older rocks viewed through a “window” in the north directed Potato Hills thrust fault (PHTF) is essentially correct, although simplified.
Observations confirm: 1) the Potato Hills were formed by erosion through the Potato Hills thrust plate and into the hangingwall of the Windingstair thrust fault (WSTF). The outermost outcrop rides on the Potato Hills thrust, the inner outcrop rides on imbricates in the hangingwall of the Windingstair thrust fault 2) late Pennsylvanian folding of the PHTF and WSTF, is evidence of the emplacement of a fault block in the footwall of the basal Choctaw Thrust fault (CTF), 3) the top of the Jackfork is an unconformity, 4) the basal surface of the Ratcliff Member is an erosional unconformity, 5) recognition of basement-involved extensional faults deforming rocks of Ordovician to Mississippian age beneath the Potato Hills structure.
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