Gravity Exploration for Petroleum in Railroad Valley, Nevada-Search for the Subtle Trap
Douglas J. Guion, William C. Pearson, 1982. "Gravity Exploration for Petroleum in Railroad Valley, Nevada-Search for the Subtle Trap", The Deliberate Search for the Subtle Trap, Michel T. Halbouty
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The gravity method is extremely important in Basin and Range exploration for subtle fault/truncation traps. In fact, significant gravity anomalies exist over all three oil fields in Railroad Valley: Eagle Springs, Trap Spring, and the more recent apparent discovery north of Eagle Springs. Primarily, Railroad Valley oil production is from Cretaceous-Eocene and Oligocene reservoirs in combination fault/truncation traps on synclinal embayments on the downthrown sides of the major basin-bounding faults. Such hydrocarbon trapping embayments represent relative "thicks" in the Tertiary isopach. Local gravity minima occur over the Tertiary "thicks," and linear gravity gradients occur over the major basin-bounding faults. Proper combinations of these gravity features indicate petroleum prospects in the Cretaceous-Eocene and Oligocene reservoirs.
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The papers included in this volume reflect both the geological and geophysical rationale used in searching for the subtle trap. The scope of the papers ranges from the general appraisal papers of new concepts and methods, to those relating to specific fields in the United States, Nigeria, China, Australia, Canada, Oman, offshore Spain, and the North Sea. The 21 chapters are sourced from a 1981 AAPG Annual Meeting session, dedicated to providing explorationists with the information needed to search for and discover the stratigraphic, paleogeomorphic, and unconformity-oriented subtle-trap accumulations of oil and gas.