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地下储气库非均质盖层渗漏通道形成过程数值模拟分析

Numerical Simulation Analysis on the Formation Process of Seepage Channel in Heterogeneous Cover of Underground Gas Storage Reservoir
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摘要 盖层受沉积、构造、成岩、地貌等多种因素的影响,往往夹带发育砂体,这些砂体严重影响着盖层的封闭能力。以国内某储气库为背景,基于对盖层中随机砂体的认识,分别建立了考虑盖层岩石非均质性、砂体的空间位置、砂体渗透系数以及砂体间间距的4种概念计算模型。以Comsol软件为平台,采用渗流-应力耦合模型研究地下储气库非均质盖层渗漏通道形成机制。经过一系列模拟计算,研究结果表明:砂体体积占盖层体积比例较低的情况下,盖层中随机分布的砂体仍然会形成流体的渗漏通道;当砂体渗透性越好时,盖层中越易形成流体的渗漏通道;随着盖层中砂体之间距离越大,流体在砂体间的渗流阻力越大,越不利于渗漏通道的形成。综合分析可知对盖层的封闭性评价时,必须同时考虑盖层岩石微观和宏观上的岩石分布特征。 Influenced by sedimentary, tectonic, diagenetic and geomorphic factors, sand bodies are often developed in the cap rocks, which seriously affects the sealing ability of the cap rocks.Based on the understanding of random sand bodies in the cap rock, four conceptual calculation models considering the heterogeneity of the cap rock, the spatial position of the sand body, the permeability coefficient of the sand body and the spacing between the sand bodies were established respectively.By means of Comsol software, the seepage and stress coupling model was used to study the formation mechanism of heterogeneous cap leakage channels of underground gas storage.A series of simulation calculations indicated that: When the sand volume accounts for a low proportion of the caprock volume, the randomly distributed sand bodies in the caprocks can still form fluid seepage channel.The more permeable the sand body is, the easier the fluid seepage channel will be formed in the cap layer.The greater the distance between sand bodies, the greater the seepage resistance of fluid between sand bodies, and the more unfavorable the formation of seepage channel.The comprehensive analysis shows that the rock distribution characteristics of both micro and macro rocks must be considered in the evaluation of the sealing ability of cap rocks.
作者 滕振超 张品金 贾善坡 温曹轩 TENG Zhenchao;ZHANG Pinjin;JIA Shanpo;WEN Caoxuan(School of Civil Engineering and Architecture,Northeast Petroleum University,Daqing 163318,China;Institute of Unconventional Oil&Gas,Northeast Petroleum University,Daqing 163318,China;School of Urban Construction,Yangtze University,Jingzhou 434023,China)
出处 《甘肃科学学报》 2022年第5期5-11,25,共8页 Journal of Gansu Sciences
基金 国家自然科学基金面上项目(42072166) 黑龙江省自然科学基金项目(LH2020D004) 深部岩土力学与地下工程国家重点实验室项目(SKLGDUEK2001)。
关键词 储气库 非均质盖层 渗流-应力耦合 Comsol 砂体 渗漏通道 Gas storage Heterogeneous capping Seepage-stress coupling Comsol Sand body Seepage channel
作者简介 滕振超(1976-),男,河北故城人,在读博士,副教授,研究方向为岩石力学、渗流力学及工程结构抗震等。E-mail:teng_zc@nepu.edu.cn;通信作者:贾善坡,E-mail:jiashanporsm@163.com。
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