Depositional conditions during chalk sedimentation in the Ekofisk area Norwegian North Sea

Abstract

A study of Late Cretaceous-Early Paleocene deposits in the Ekofisk area is based on a large amount of data available in the Norwegian Petroleum Directorate. The quality of this material was furthered by additional detailed micropalaeontological. sedimentological, structural and diagenetic studies. Several prominent units ol allochthonous chalk deposits have been recognized. Based on micropalaeontological and sedimentological data. it is now possible to define these units properly. It has been attempted to map these allochthonous units as well as their source areas in order to gain a better understanding of the depositional environments during Chalk deposition in the Central Graben.