Geology of the Hibernia Discovery
The Hibernia oil field was discovered by Chevron Standard Ltd. and partners in 1979. The discovery well, Chevron et al Hibernia P-15, was drilled on the Grand Banks 325 km east of St. John's Newfoundland in 80 m of water. Delineation drilling, completed during 1980 and the early part of 1981, has confirmed the pressure of a giant oil field which, in all probability, will contain recoverable reserves in excess of 1 billion bbls of oil. The discovery and first delineation wells each have an indicated productivity in excess of 20,000 b/d.
The oil field is located near the northwestern edge of the Jeanne d'Arc subbasin, a southwestern extension of the much larger East Newfoundland Basin. The Hibernia structure is a large north-northeast trending rollover anticline, bounded on the west by a major listric growth fault, and dissected into a number of separate blocks by transverse faults. The potentially most productive reservoirs are sandstones of Lower Cretaceous age which appear to be deltaic in origin.
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The Deliberate Search for the Subtle Trap
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.