Oil/Source Rock Correlation for Beatrice Oil, Moray Firth, United Kingdom

K. E. Peters, J. M. Moldowan, A. R. Driscole, G. J. Demaison

Published geological and organic geochemical work has shown that the major oil accumulations in the North Sea were generated from Upper Jurassic (Kimmeridge) rocks. However, despite several inconclusive geochemical studies, the source of oil in the Beatrice field in the Inner Moray Firth has remained uncertain for many years.

Computerized gas chromatography/mass spectrometry, supporting geochemical analyses, and hydrous pyrolysis were used to compare selected oils and bitumens from the Moray Firth area. Using a battery of biomarker parameters and stable carbon isotope ratios, the samples were classified as to source and level of thermal maturity. The results conclusively establish the origin of the Beatrice oil and may significantly change exploration strategies in this portion of the North Sea.

AAPG Search and Discovery Article #91030©1988 AAPG Annual Convention, Houston, Texas, 20-23 March 1988.