--> Abstract: The Red Fork Sandstone of the Deep Anadarko Basin - A Submarine Fan, by E. R. Anderson; #90987 (1993).

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ANDERSON, ERIC R., Louisiana Land and Exploration Co., New Orleans, LA

ABSTRACT: The Red Fork Sandstone of the Deep Anadarko Basin - A Submarine Fan

Active exploration and development drilling for the upper Pennsylvanian Red Fork sandstone has been going on since 1979 in the western part of the Anadarko Basin of Oklahoma. The fine grained, low permeability, gas and gas condensate reservoir produces at depths ranging from 12,000 to 14,000 feet from stratigraphic traps. Though drilling has generally been continuous through the years, the Red Fork play is very sensitive to gas price because of drilling depths and reservoir characteristics. The play is now mature but because of the complexity of the depositional environment, it is still difficult to predict the good quality reservoir sandstone.

Isopach maps, log curve shapes, lithologic information and seismic data are all utilized to define the facies within a submarine fan. In the Red Fork most of the sand was deposited in the middle fan with the best reservoirs found in narrow channels of the supra-fan lobes. Quality of the reservoir rock in the levee facies deteriorates significantly away from the channel. The gross morphology of the interpreted supra-fan lobes in the Red Fork is similar to those seen in the modern Mississippi River submarine fan and the ancient Tabernas Basin fan in southeast Spain.

Utilizing 2-D and 3-D seismic data to map the supra-fan lobes and channel systems has proved to be very challenging in the Red Fork. However, careful integration of all the well information with the seismic data will yield the best interpretation. Changes in amplitude are used to help define the presence or absence of sandstone and the relative quality of the reservoir.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.