Abstract
ABSTRACT A comprehensive treatment of pressure transient analysis of naturally fractured reservoirs is presented. Parameter estimation is based on pattern recognition, type curve matching, and auxiliary correlations. Pattern recognition verifies the amenability of data to analysis as well as the applicability of the model to observed behavior. Conditions under which a variety of pressure response patterns develop, are rigorously established. For each pattern, the applicable analysis procedure is specified. A type curve is developed that incorporates interporosity flow response ranging from unsteady state to pseudo-steady state. Thus, type curve analysis determines the governing mode of interporosity flow and yields the reservoir parameters accordingly. Auxiliary correlations are based on a thorough analysis of the transition curve. The correlations independently determine the reservoir parameters and thereby assist type curve analysis. In certain cases, the correlations can determine the proportion of matrix that contributes under "restricted" and "unrestricted" conditions. The developed procedure is readily amenable to computer aided analysis of pressure transient data in naturally fractured reservoirs.
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