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Material Balance Equation and Reserves Calculation Method Considering Water Soluble Gas for Shale Gas Reservoirs
Author(s): SHANG Ying-xue, LI Xiao-ping, SONG Li, State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Drilling & Production Engineering Technology Research Institute, Chuanqing Drilling Engineering Company Limited, PetroChina
Pages: 1183-
1189
Year: 2015
Issue:
6
Journal: Natural Gas Geoscience
Keyword: Shale gas; Water soluble gas; Material balance equation; Reserves calculation;
Abstract: During the formation process of shale gas reservoirs,there are possibilities to contain water in the formation.However,conventional material balance equations for calculating shale gas reserves rarely consider the influence of water soluble gas.Therefore,a modified material balance equation should be studied for rational prediction of shale gas reserves.Based on the principle of volumetric balance in the formation,the shale gas reservoir was divided into two types,the one with matrix and the one with fracture.With the aid of gas solubility equation,the solubility for methane in the formation water was achieved under different formation pressures.Eventually,a modified material balance equation was established taking into the consideration of water soluble gas and the method for calculating reserves was achieved by means of linearizing the modified equation at the same time.Case study shows that the correlation coefficients of the line regressed by the new model is higher than that regressed by a conventional model in the literature.What′s more,the reserve calculated by the method presented in this article is a bit higher than that predicted by the method in the literature,which can be explained by the ignorance of water soluble gas.In conclusion,the water soluble gas is also an existing gas form of shale gas reservoirs that cannot be neglected during the process of establishing a more reliable material balance equation and better prediction of reserves.
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