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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 55 (1971)

Issue: 2. (February)

First Page: 334

Last Page: 334

Title: Geology and Development of Hewett Gas Previous HitFieldNext Hit, United Kingdom Previous HitNorthNext Hit Previous HitSeaNext Hit Area: ABSTRACT

Author(s): A. D. Cumming, Charles L. Wyndham

Article Type: Meeting abstract


The Hewett gas Previous HitfieldNext Hit is 15 mi off the Norfolk coast, and has an estimated 3.5 Tcf of recoverable gas contained in 2 Triassic Bunter sandstones. The Previous HitfieldNext Hit was discovered late in 1966 and placed on production in July 1969. By that time 22 wells had been drilled, permanent offshore and onshore facilities installed, unitization negotiations concluded, and market secured. The contract with the purchaser calls for a gradual increase in daily production to an average rate of 600 MMcf by 1974. The 2 reservoirs are largely coextensive, and the Previous HitfieldNext Hit, roughly elliptical in outline, has a length of 18 mi and a maximum width of 3 mi. Average depth to the middle Bunter Sandstone is 3,000 ft and to the lower Bunter Sandstone is 4,150 ft. Maximum observed gross pay thicknesses are 323 f (middle) and 202 ft (lower). Both reservoirs have excellent porosity and permeability. The Hewett structure is apparent on seismic profiles and at both Bunter levels a fault-bounded, NW-SE-trending anticline is present. The gas in the lower Bunter differs from that in the middle Bunter in that it is free of hydrogen sulfide, but whether this implies different sources has not been demonstrated conclusively. The lower Bunter Sandstone has a limited distribution in the Previous HitNorthNext Hit Previous HitSeaNext Hit area. Since the discovery of Hewett several Previous HitNorthNext Hit Previous HitSeaNext Hit wells have found gas in the middle Bunter, but follow-up wells have been unsuccessful. The Hewett Previous HitfieldTop may remain unique.

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