Combined Geologic and Surface Geochemical Methods Used to Discover Agaritta, Brady Creek, Selden, and New Year ‘95 Fields, Concho County, Texas, U.S.A.
D. F. Saunders, K. R. Burson, J. J. Brown, C. K. Thompson, 2002. "Combined Geologic and Surface Geochemical Methods Used to Discover Agaritta, Brady Creek, Selden, and New Year ‘95 Fields, Concho County, Texas, U.S.A.", Surface Exploration Case Histories: Applications of Geoschemistry, Magnetics, and Remote Sensing, Dietmar Schumacher, Leonard A. LeSchack
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From December 1987 to March 1991, several operators tested 25 prospects in the lower King sand (Upper Pennsylvanian Cisco Group) play in Concho County, Texas, U.S.A. They used combinations of subsurface geology, reconnaissance airborne gas sensing, surface radiometrics, soil magnetic-susceptibility, and soil-gas hydrocarbon measurements to define prospects. Six new King sand discoveries or extensions and three deeper Goen Limestone discoveries resulted in an estimated exploratory success rate of 36%, and the total exploration and development cost through 1998 was approximately $0.89/bbl of proven producing oil equivalent. Locations for the discovery wells on each of the successful prospects were based primarily on combined subsurface geologic and surface geochemical data.
As detailed examples, we present information on the discovery of Brady Creek and Agaritta fields. The discovery of Agaritta, one of the two largest new-field discoveries, was based on a combination of (1) regional subsurface geologic projection, (2) airborne hydrocarbon sensing, (3) interstitial soil-gas hydrocarbon data, (4) soil magnetic-susceptibility measurements, and (5) surface potassium and uranium concentrations measured by gamma-ray spectrometry.
Also included are surface geochemical data over part of the Lonesome Dove II–Pipe Dream (King sand) field, which clearly demonstrate the complementary nature of anomalies in soil-gas hydrocarbon and soil magnetic-susceptibility measurements.
Subsequent King sand play exploration of the area generally northeast of Agaritta field did not find any further King sand production but did lead to the discovery of the Selden gas field and the New Year ‘95 and Dark Horse oil fields, all producing from the deeper Goen Limestone.
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Surface Exploration Case Histories: Applications of Geochemistry, Magnetics, and Remote Sensing provides an overview of successful applications of surface exploration methods. Through a series of independent case histories, this volume presents clearly documented evidence that demonstrates how surface exploration methods can significantly reduce exploration risk and finding costs: geochemical, magnetic, and remote sensing. The 19 chapters in this volume reflect the broad scope of applications for these methods: frontier basin reconnaissance, prospect development, prospect evaluation, and field development and production. The case histories span the globe: 1. North America 2. Africa 3. South America 4. Europe 5. Middle East 6. Australia. This book will interest explorationists and managers who seek to get the most out of each exploration dollar.