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Discovery and Development of the Person Field, Karnes County, Texas
M. A. Reagan, Jr. (1), R. T. Foust, Jr. (2)
Person Field is significant principally because it has proven the presence of oil accumulation in commercial quantities in the downdip portion of the Edwards trend.
The Field is similar to other well-known Edwards limestone fields of South Texas, in that it produces on the upthrown side of a north dipping fault which faults the upper Edwards against the impervious Georgetown limestone. The productive section in the Person Field consists of the upper 200-350 feet of the Edwards. This section is characterized by streaks of porous limestone with considerable fracturing and vugular to intergranular porosity separated by sections of hard dense limestone with no measurable porosity or permeability. Three productive sections tested in the discovery well had average porosities of 11-13 percent and average permeabilities of 11-12 millidarcies. A definite gas-cap approximately 200 feet thick has been established. The oil column appears to have a thickness of 100 to 150 feet. With the existence of the thick gas-cap, high ratio problems have been fairly common and thus have complicated completions.
The Field is still in the process of development and the limits have not been defined; however, as this paper is written, the Field extends 4 miles in a northeast-southwest direction and approximately 1 to 1/12; miles in a northwest-southeast direction. Sixteen wells have been completed, five wells are drilling and one is testing.
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