15/12-21 (Grevling) is a discovery in the central part of the North Sea, 15 kilometres south of the Sleipner Øst field. The water depth is 90 metres. Grevling was proven by well 15/12-21 in 2009, and delineated by wells 15/12-21 A, 15/12-23 and 15/12-23 A. The discovery is situated above a large salt structure. The reservoir contains oil in sandstone of Late Triassic to Middle Jurassic age in the Skagerrak, Bryne, Sleipner and Hugin Formations. Various options are being evaluated for a combined development with the adjacent 15/12-18 S (Storskrymten) discovery. The plan for development and operation (PDO) is expected to be submitted by the end of 2020.
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