Assertion: ekofisk field | /r/CapableOf | form structure
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Source sentences:
text: The Ekofisk field is a north-south trending anticline, with a central graben, forming a structure that is 49 km2 (19 sq mi) in area, with 244 m (801 ft) of vertical closure and a hydrocarbon column 305 m (1,001 ft) long, formed by Permian Zechstein salt movement in the form of salt pillows.