页岩储层物性参数对CO_(2)不同封存机制及封存量的影响  

Effects of Physical Parameters of Shale on CO_(2) Storage Capacity with Different Mechanisms

作　　者：尹书郭 杨国栋 冯涛[1] 马鑫[2] 曹伟[3] 黄冕 郭天晴 YIN Shuguo;YANG Guodong;FENG Tao;MA Xin;CAO Wei;HUANG Mian;GUO Tianqing(College of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Center for Hydrogeology and Environmental Geology of China Geological Survey,Baoding 071051,China;Institute of Geology of Pudong Oil Production Plant,Sinopec Zhongyuan Oilfield,Puyang 457001,China)

机构地区：[1]武汉科技大学资源与环境工程学院,武汉430081 [2]中国地质调查局水文地质环境地质调查中心,保定071051 [3]中国石化中原油田濮东采油厂地质研究所,濮阳457001

出　　处：《高校地质学报》2023年第1期37-46,共10页Geological Journal of China Universities

基　　金：国家重点研发计划项目(2019YFE0100100);湖北省自然科学基金(2019CFB451);海洋地质资源湖北省重点实验室开放基金(MGR202003);湖北省大学生创新创业训练计划项目(S202110488009)联合资助。

摘　　要：CO_(2)增强页岩气开采技术(CO_(2)-ESGR)一方面可提高CH_(4)产量,另一方面又可实现CO_(2)地质封存。为了分析页岩储层物性参数对CO_(2)封存机制的影响,文章以鄂尔多斯盆地延长组页岩为研究对象,采用CMG-GEM软件建立双孔双渗均质模型,分析了CO_(2)-ESGR中页岩储层垂直渗透率与水平渗透率之比(K_(v)/K_(h))、含水饱和度和孔隙度对不同CO_(2)封存机制封存量的影响;并设计了27组正交试验采用极差分析法比较了三种因素的影响程度。研究表明,K_(v)/K_(h)在0.1~1范围增大会增加不同CO_(2)封存机制的封存量,封存总量最大可增加69.96%,其中吸附封存量最大可增加97.96%,受到影响最大;含水饱和度在0~0.9范围增大引起CO_(2)封存总量先增加后减小,封存总量最大可减少67.12%,其中溶解封存量最大可减少83.35%,范围波动最大;页岩储层孔隙度在0.1~0.99范围增大会导致CO_(2)封存总量减少,封存总量最大可减少95.38%,其中吸附封存量最大可减少99.99%,减少百分比最大。极差分析表明,含水饱和度对构造封存量、残余封存量和溶解封存量的影响最大,孔隙度对CO_(2)封存总量和吸附封存量的影响最大,K_(v)/K_(h)对CO_(2)不同机制封存量的影响最小。在页岩储层中进行CO_(2)封存时,为获得最大封存量,应选择低含水饱和度、低孔隙度和高垂直渗透性的页岩层。CO_(2)enhanced shale gas recovery(CO_(2)-ESGR) can not only increase CH_(4) production, but also store CO_(2). In order to investigate the effects of physical parameters of shale on CO_(2)sequestration mechanisms, a dual-porosity, dual-permeability homogeneous model was established using CMG-GEM based on the shale of Yanchang Formation in Ordos Basin. This study analyzed the effects of vertical permeability to horizontal permeability ratio(K_(v)/K_(h)), water saturation and porosity of shale on CO_(2)storage capacity with different mechanisms in CO_(2)-ESGR. Moreover, 27 sets of orthogonal tests were designed to investigate the extent of influence of these three factors by range analysis. The results showed that K_(v)/K_(h) increase in the range of 0.1 to 1 leads to enhanced CO_(2)storage capacity with different mechanisms, and the maximum storage capacity can increase by 69.96%, of which the adsorption storage capacity can increase by 97.96%. Water saturation increase in the range of 0-0.9 induces the total CO_(2)storage to show an increase first and then a decrease. The maximum storage capacity can reduce by 67.12%, of which the dissolved storage capacity can reduce by 83.35%, with the largest range fluctuation. Shale porosity increase in the range of 0.1-0.99 leads to the reduction of total CO_(2)storage capacity, and the maximum storage capacity can reduce by 95.38%, of which the adsorption storage capacity can reduce by 99.99%. Range analysis showed that water saturation has the largest impact on the amount of structural trapping, residual trapping and solubility trapping, porosity has the largest impact on total CO_(2)storage capacity and adsorption storage capacity, and K_(v)/K_(h) has the least effect on CO_(2)storage capacity with different mechanisms.For CO_(2)storage in shale reservoirs, shale with low water saturation, low-porosity and high Ky/Kh ratio is suggested to obtain the maximum storage capacity.

关 键 词：CO_(2)地质封存 页岩 物性参数 封存机制 数值模拟 

分 类 号：X701[环境科学与工程—环境工程]