Extra-deep azimuthal resistivity improves navigation in a complex Barents Sea reservoir

摘要

Goliat is an Eni Norge-operated oil field in the Arctic Barents Sea, 85 km northwest of the city Hammerfest, Fig. 1. The Goliat reservoirs have a complex structure, characterized by a large number of faults and a relatively high structural dip toward the flank of the structure. This challenging combination calls for horizontal production wells for effective drainage. Goliat field consists of several proven hydrocarbon reservoir units, but only Kobbe producers have been drilled. The Kobbe formation is of Middle Triassic age and is divided into two main subgroups. The Upper Kobbe represents essentially a prograding deltaic system, with mouth bars and tidal-influenced lobes. In the Lower Kobbe, the formation shifts into a more proximal, heterogeneous fluvial setting, where sand bodies have limited lateral continuity.