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天然气地球科学

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考虑水溶气的页岩气藏物质平衡方程及储量计算方法

尚颖雪，李晓平，宋力   

  1. 1.西南石油大学“油气藏地质及开发工程”国家重点实验室，四川 成都 610500；
    2.中国石油川庆钻探工程有限公司钻采工程技术研究院，四川 广汉 618300
  • 收稿日期:2014-09-19 修回日期:2014-11-02 出版日期:2015-06-10 发布日期:2015-06-10
  • 作者简介:尚颖雪(1991-)，女，山东东营人，硕士研究生，主要从事油气藏工程及渗流力学研究. E-mail：syxswpu@163.com.
  • 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

SHANG Ying-xue，LI Xiao-ping，SONG Li   

  1. 1.State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;
    2.Drilling and Production Engineering Technology Research Institute,Chuanqing Drilling EngineeringCompany Limited,PetroChina,Guanghan 618300,China
  • Received:2014-09-19 Revised:2014-11-02 Online:2015-06-10 Published:2015-06-10

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摘要：

页岩储层在成藏过程中具有含水的可能性，常规的物质平衡方程未考虑水溶气的影响。为此，基于页岩气藏地下储集空间体积平衡原理，将页岩储层划分为基质与裂缝2个系统，利用气体溶解度方程求解了甲烷在水中的溶解度，从而建立了考虑水溶气的页岩气藏物质平衡方程，并通过线性化处理，给出了页岩气藏储量计算的方法。实例计算表明，所建立的物质平衡方程直线相关系数更高，计算的储量结果高于未考虑水溶气时计算的储量，当页岩气藏产水时不能忽视水溶气对页岩储量的影响。

关键词: 页岩气, 水溶气, 物质平衡方程, 储量计算

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.

Key words: Shale gas, Water soluble gas, Material balance equation, Reserves calculation

中图分类号: 

  • TE155

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