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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology

Abstract

Journal of Petroleum Geology, Vol.7, No.2, pp.189-212, 1984

©Copyright 2000 Scientific Press, Ltd.

EFFECTS OF EPIDIAGENESIS ON RESERVOIR CHARACTERISTICS
OF ROCKS BENEATH CONCEALED UNCONFORMITIES IN ENGLAND
AND THE WESTERN DESERT, IRAQ

M. B. Al-Gailani* and M. A. Ala*

*Department of Geology, Petroleum Geology Section, Royal School of Mines, Imperial College of Science and Technology, London SW7 2BP.


Abstract

Petrographic and reservoir characteristic studies (porosity and permeability measurements) were carried out on 447 core samples from seven boreholes penetrating concealed unconformities in England and the Western Desert of Iraq. In England, the unconformities occur at the following boundaries: (a) Cretaceous/Devonian; (b) Lower Lias/Rhaeto-Liassic/Beds of unknown age/Carboniferous Limestone Series; (c) Triassic/Lower Carboniferous; (d) Triassic/Upper Coal Measures (equivalent to Upper Pennsylvanian); and (e) Triassic/Permo-Trias/Permian. The borehole in the Western Desert of Iraq encountered five unconformities, in successions ranging in age from the Carboniferous to the Cretaceous.

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