15/21-21 (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. The discovery was proven in 2009, and subsequently 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 development options are being evaluated and the plan for development and operation (PDO) is expected to be submitted in 2020.
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