Extended Abstract:

UPPER PERMIAN HALIBUT CARBONATE FORMATION, WITCH GROUND GRABEN AREA, NORTH PERMIAN BASIN, UKCS: SEDIMENTOLOGY, CORRELATION AND RESERVOIR QUALITY

Giancarlo Rizzi ^*# and Graham Frederick Aplin ^*

^* Task Fronterra Geoscience Limited, Unit F, Kettock Lodge, Campus 2, Aberdeen Innovation Park, Balgownie Drive, Bridge of Don, Aberdeen, AB22 8GY.

^# corresponding author, email: giancarlo.rizzi@taskfronterra.com

In the Witch Ground Graben area in the central-northern UK North Sea, four deviated wells (referred to here as wells A-D) have intersected the Halibut Carbonate Formation. This formation, which ranges in thickness from ca. 350 ft to ca. 100 ft from west to east, was deposited locally as part of the Upper Permian succession in the Northern Permian Basin. It consists of the lower Argyll Carbonate Member and the upper Innes Carbonate Member separated by the Iris Anhydrite Member. The formation is broadly equivalent to the Z1 and Z2 cycles of the Zechstein Supergroup in the better-known Southern Permian Basin. A distinctive conglomerate caps the Argyll Carbonate Member and is also recognised within the Iris Anhydrite Member, and is a possible equivalent to the Bosies Bank Formation.

Key words: North Permian Basin, Halibut Carbonate Formation, sedimentology, correlation, reservoir quality.

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