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The Ordovician Oil Creek sand is found over most of central and southern Oklahoma and parts of Cooke and Grayson counties, Texas. It is one of the best oil- and gas-producing formations in this area.
Subsurface and surface control now available places the western limit of the sand along a line which extends from Stephens County, Oklahoma, to Grayson County, Texas. Generally, in Oklahoma, the limit of the sand is the result of a facies change; in Texas, it is the result of truncation.
Isopachous interpretations in southern Oklahoma show a rapid thickening of the sand away from the strand line. The sand is generally thin in northern Texas.
There have been several recent deep gas-distillate discoveries in Love County, Oklahoma, and Grayson County, Texas, in the Oil Creek sand. Most of these fields seem to be associated with structural traps. There are, however, truncation traps in Grayson County containing oil.
Large accumulations of oil or gas which have used the wedge-out nature of the sand as a trapping agent have not been found so far; however, there are several areas which seem prospective for a trap of this type in the Oil Creek sand.
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