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Geological Society, London, Special Publications; 1995; v. 94; p. 77-94;
DOI: 10.1144/GSL.SP.1995.094.01.07
© 1995 Geological Society of London

Sandstone diapirism and clastic intrusion in the Tertiary submarine fans of the Bruce-Beryl Embayment, Quadrant 9, UKCS

R. J. Dixon1, K. Schofield2, R. Anderton1, A. D. Reynolds3, R. W. S. Alexander1, M. C. Williams4 & K. G. Davies1

1 BP Exploration, Farburn Industrial Estate, Aberdeen, AB2 0PB, UK
2 BP Exploration, Sage Plaza One, 5151 San Felipe, PO Box 4587, Houston, Texas 77210, USA
3 BP Exploration, 4/5 Long Walk, Stockley Business Park, Uxbridge, Middlesex, UB11 1BP, UK
4 BP Exploration Company (Columbia) Ltd, Carrera 9a 22-09, A.A. 59824, Santafe de Bogota, Columbia

Submarine fans of Late Palaeocene and Early Eocene age form important hydrocarbon reservoirs in the Bruce-Beryl Embayment, northern North Sea. The Early Eocene fans are the main reservoirs in the Forth-Gryphon oilfields and in the giant Frigg gasfield. Significant oil discoveries have also been made in Late Palaeocene fans. Forth and Gryphon lie on the flanks of the Crawford Anticline, a drape structure that developed during the Palaeocene above the crest of a Mesozoic tilted fault block. The Early Eocene fans pinchout against the flanks of the anticline implying continued growth of the structure throughout the Eocene. Growth was accompanied by the development of major gravity slides that detached in a sequence of altered, basaltic tephras at the base of the Eocene sequence. Seismic-scale, post-depositional deformation (sandstone diapirism and the intrusion of clastic sills and dykes) connected with this sliding dramatically modified the original depositional geometries of the fans. A detailed account of the deformation features, illustrated with core, wireline log and three-dimensional seismic data is presented together with a discussion of their exploration/appraisal significance.





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