收稿日期: 2014-09-19
修回日期: 2014-11-02
网络出版日期: 2015-06-10
基金资助
国家杰出青年科学基金“油气渗流力学”(编号:51125019)；教育部“长江学者和创新团队发展计划”(编号:IRT1079)联合资助.
Material Balance Equation and Reserves Calculation Method Considering Water Soluble Gas for Shale Gas Reservoirs
Received date: 2014-09-19
Revised date: 2014-11-02
Online published: 2015-06-10
尚颖雪，李晓平，宋力 . 考虑水溶气的页岩气藏物质平衡方程及储量计算方法[J]. 天然气地球科学, 2015 , 26(6) : 1183 -1189 . DOI: 10.11764/j.issn.1672-1926.2015.06.1183
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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