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International Journal of Petroleum and Geoscience Engineering
IJPGE 2015, 3(1), 61-68
Determination of Matrix Block Height in Naturally Fractured Reservoirs Using the Material Balance Method
a Ahvaz Faculty of Petroleum, Petroleum University of Technology, Ahvaz, Iran.
b Pars Oil and Gas Company, Asaluye, Iran
ABSTRACT
High change in permeability due to existence of fractures is a factor altering the production mechanism in naturally fractured reservoirs compared to conventional reservoirs. Development of an appropriate model to describe reservoir behaviour can provide valid prediction of the future performance. Availability of matrix block height which determines production due to gravity force is a feature of a suitable model for description of such reservoirs. Production due to gravity drainage mechanism doesn’t occur when matrix height is less than its threshold size and production due to imbibition mechanism is decreased. Hence the objective of this work is development of an equation for estimation of matrix block height. First the material balance equation was solved for determination of initial oil in place, after that equations for calculation of matrix block height was obtained for Warren & Root and Kazemi models. The results show a good agreement between defined block height and block height calculated from derived equations in such a way an error of 2.9% for Warren & Root model and of 3.3% for Kazemi model had been achieved.