Fortescue Field–An Unconformity Trap in the Gippsland Basin, Australia
R. C. N. Thornton, B. J. Burns, A. K. Khurana, A. J. Rigg, 1982. "Fortescue Field–An Unconformity Trap in the Gippsland Basin, Australia", The Deliberate Search for the Subtle Trap, Michel T. Halbouty
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The Gippsland basin in offshore Victoria, Australia, was renowned for its generally simple, hydrocarbon traps: large features where, despite commonly interbedded sequences, the high lateral and vertical sand continuity resulted in simple oil/water contact configurations. It was not considered the place for existence of subtle traps—that is, not until the drilling of a dry hole provided sufficient clues to allow the evaluation of a concept to be one of the objectives in drilling a field-delineation well. The result was a new discovery—a new concept in exploration in the basin. Even so, it took additional delineation wells before it became possible to finally prove the concept. Although the concept was felt to have been proved, it became necessary to justify this "new" oil, using techniques of detailed reservoir description including geometry and environments of deposition, paleogeography, geochemistry, and reservoir pressure data.
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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.