Abstract
Abstract The Chanter Field is located 11 krn southeast of the Piper Alpha platform location in Block 15/17. The field was discovered by the 15/17–13 well, which tested 37.8° API crude from Galley sandstone turbidites and 52.1& API gas-condensate from the shallow marine sands of the Piper Formation. The Galley sandstone reservoir is overpressured, whereas the Piper sandstone reservoir is normally pressured. The bulk of the field occupies the culmination of a structural terrace on the downthrown side of the main E-W fault forming the northern margin of the Witch Ground Graben in this area. It has dip closure to the east, south and west and fault closure to the north. The 'main block' gas-water contact of 13 080 ft TVSS in the Piper sandstone and the oil-water contact of 12 240 ft TVSS in the Galley sandstone were deduced from wireline pressure measurements and have not been encountered in wells. Estimated proved reserves of 4.6 MMBBL of crude oil and condensate liquids and 20.8 BCF of gas will be produced through a cluster of wells tied back to the Piper Field by a subsea pipeline.
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