--> ABSTRACT: DHIs Validation for Amauligak Oil Field, Canadian Beaufort Sea, by Michael E. Enacheschu and J. H. Leon Demers; #91022 (1989)

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DHIs Validation for Amauligak Oil Field, Canadian Beaufort Sea

Michael E. Enacheschu, J. H. Leon Demers

The giant Amauligak field is a three-way fault bounded block situated in the eastern area of the Beaufort Sea known as the growth fault sector. The Amauligak structure was triggered by a major synsedimentary fault trending northeast-southwest. Interbedded sands and shales of the Oligocene Kugmallit Sequence (Pullen delta front) form the core of the structure. A strong amplitude anomaly was recognized on older seismic data in the crestal area of the structure at the top of the Kugmallit Sequence-Pullen unconformity level. Recent (1986) exploration three-dimensional data reveal diverse DHIs including: bright spots, phase change, shadow zone and flat spot, all associated with a large gas cap. Interpretation of seismic data and interactive seismic modeling suggest that a comb nation of structural, stratigraphic, and hydrodynamic factors are responsible for the aspect and distribution of DHIs at the Amauligak field. Although the gas/liquid contact is seismically mappable over the field, the nature of the downdip liquid remained unknown. To overcome this ambiguity, highly deviated wells were drilled to investigate the reservoir above and below the edge of the amplitude anomaly.

AAPG Search and Discovery Article #91022©1989 AAPG Annual Convention, April 23-26, 1989, San Antonio, Texas.