The 34/10 Delta Prospect of the Norwegian North Sea: Exploration Study of an Unconformity Trap
O. Skarpnes, E. Briseid, D. I. Milton, 1982. "The 34/10 Delta Prospect of the Norwegian North Sea: Exploration Study of an Unconformity Trap", The Deliberate Search for the Subtle Trap, Michel T. Halbouty
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Tilted fault blocks, with Middle and Lower Jurassic reservoir intervals, below the late Kimmerian unconformity are the main exploration targets in the northern North Sea. The 34/10 Delta is one of the biggest structures on the unconformity level. Because of poor subunconformity seismic data quality on early records, Jurassic reservoir intervals could not be positively identified. On seismic data collected in 1974, high-dip events below the late Kimmerian unconformity were identified as Jurassic events. These data, reprocessed in 1976, were used in the final mapping before the first well was drilled in 1978. A prospect evaluation based on regional geology and analogies with similar structures in the region gave high hopes for the 34/10 Delta prospect. The 34/10 Delta structure was declared commercial in 1980. Recoverable reserves are estimated to be 0.24 × 109 cu m (1.5 × 109 bbl) of oil.
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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.