--> ABSTRACT: Ultimate Recovery Analysis by Formation and Play for Deep Anadarko Basin and Estimation of Undiscovered Gas Potential, by Robert H. Hugman; #91030 (2010)

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Ultimate Recovery Analysis by Formation and Play for Deep Anadarko Basin and Estimation of Undiscovered Gas Potential

Robert H. Hugman

Deep gas resources have assumed a growing role in the United States gas picture since the mid-1960s. The deep Anadarko basin has been one of the areas of heavy activity, and is though to contain a significant portion of the remaining unproven deep gas resource in the lower-48 states. A detailed analysis of gas production and proven reserves in the deep basin has established the characteristics and historical importance of each of the major plays and productive formations. The analysis should prove to be a valuable tool in estimating the undiscovered gas potential of the deep basin.

Through 1985, there were 908 completions in the deep Anadarko basin. These completions accounted for 6.10 tcf of proven ultimate recovery, an average of 6.72 bcf per completion. In general, there is one completion per well and one well per section. Thus, ultimate recovery per completion represents ultimate recovery per section. The Hunton Group has the highest mean ultimate recovery at 15.3 bcf, followed by the Arbuckle Group at 10.1 bcf. The Springer Group, the focus of much of the basin's activity during the exploration boom, has a mean ultimate recovery of 5.3 bcf per completion. Within the eastern Springer stratigraphic play, the average is 4.8 bcf. This figure substantiates reports that the productive characteristics of this interval have fallen short of initial expectations.

In an attempt to evaluate existing resource appraisals of the deep basin, the areal distribution of production by formation was determined for the mature, shallow part of the basin. Over 20,000 completions were included in this analysis, demonstrating a significant database application. By using this distribution as a guide, along with certain other constraints, a range of 15-47 tcf of undiscovered potential was estimated.

AAPG Search and Discovery Article #91030©1988 AAPG Annual Convention, Houston, Texas, 20-23 March 1988.