This paper presents the development of the theory and of a computer program to predict subsidence and horizontal displacement due to oil and gas withdrawal. Geertsma's nucleus of strain model has been modified and combined with an influence function program, developed for the prediction of mining subsidence, to form a new technique for the prediction of ground movements over oil and gas fields. The modifications and the influence function theory are described in detail, with particular emphasis being placed on the applicability of the developed theory to computer prediction. The influence function method allows complex reservoir geometry to be taken into account and both subsidence and associated horizontal ground movements may be calculated.

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