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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology

Abstract

Journal of Petroleum Geology, Vol.5, No.1, pp. 77-88, 1982

©Copyright 2000 Scientific Press, Ltd.

SEDIMENTOLOGICAL EVOLUTION AND NATURAL RADIOACTIVITY OF TERTIARY SEDIMENTS FROM THE CENTRAL NORTH SEA

S. Berstad and H. Dypvik*

*Institutt for Geologi, Universitetet i Oslo, Postboks 1047, Blindern. Oslo 3, Norway.

Abstract

In the North Sea well studied in this paper, the radioactive isotopes of U, Th and K are shown to control the variations in the gamma-log response. Th and K are associated with the clay fraction, while U is enriched in the silt fraction. In the volcaniclastic Palaeocene and Eocene beds, low gamma activity is due to a high content of volcanic debris poor in U and Th, while higher gamma activity in the younger beds indicates the decrease in volcaniclastic material.

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