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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology

Abstract

Journal of Petroleum Geology, Vol.7, No.1, pp.97-108, 1984

┬ęCopyright 2000 Scientific Press, Ltd.

WATER-SENSITIVITY AND MIGRATION OF FINES
IN THE HOPEMAN SANDSTONE

Andrew Lever* and Richard A. Dawe*

*Department of Mineral Resources Engineering, Imperial College, London SW7 2BP.


Abstract

Water-sensitivity tests have been performed on samples of the Triassic Hopeman Sandstone from Clashach Quarry near Elgin in Scotland. Despite the apparent lack of clay minerals in the samples, the permeability of core plugs to NaCl and KCl brines decreases with progressive volume of effluent, and drops dramatically when distilled water is flushed through. The permeability to CaCl2 brines remains constant, however, emphasising the stabilising effect of polyvalent cations. These results are explained by cation exchange, expansion of electric double layers and the consequent migration of fines.

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