Various investigators (e.g. Vacquier, Holmes, Kintzinger & Lavergne 1957, Ogilvy & Kuzmina 1972) have noted a connection between clay content in sandstones and induced polarisation (I.P.). A correlation between I.P. and permeability has also been briefly mentioned or inferred by some of these workers, though little systematic work has been done in this field. The investigations described below had two objectives, one of which was to find out if I.P. could be used to determine matrix conductivity (Patnode & Wyllie 1950, Worthington & Barker 1972) and the other to ascertain whether there was any simple relationship between I.P. amplitude and permeability in Triassic sandstones.

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