不同流体与黏土矿物对岩石渗透率影响实验研究  

Experimental study on the influence of different fluid media and clay minerals on rock permeability

作　　者：王猛[1] 李星甫 杨鑫 刘海波[1] 张志强[1] 徐大年[1] 刘志杰 WANG Meng;LI XingFu;YANG Xin;LIU HaiBo;ZHANG ZhiQiang;XU DaNian;LIU ZhiJie(China Oilfield Services Limited,Sanhe 065201,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 61Q500,China)

机构地区：[1]中海油田服务股份有限公司,三河065201 [2]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500

出　　处：《地球物理学进展》2022年第1期275-283,共9页Progress in Geophysics

基　　金：国家自然科学基金青年基金项目“致密油储层岩石注水吞吐实验与多尺度动态网络模拟研究”(41902157)资助。

摘　　要：储层的渗透率是描述流体在岩石中渗透性的固有属性,在实验室测量的样品液体渗透率往往小于克式校正法修正后的Klinkenberg渗透率.本研究分别以氮气和盐水为介质,分别测量了30块不含黏土矿物的枫丹白露砂岩试块与30块含黏土矿物的Y砂岩试块的渗透率,用以研究不同流体与黏土矿物对渗透率的影响以及气体测量渗透率时滑脱因子b的影响因素.本次实验结果表明,所有试块采用盐水测得的液体渗透率值均小于氮气测的Klinkenberg渗透率值,且Y砂岩的液体渗透率与Klinkenberg渗透率的差异比枫丹白露砂岩更大.同时,在采用液体为介质测量渗透率时,液体与岩石内部表面产生液膜使得枫丹白露砂岩液体渗透率降低,同时液体与黏土矿物的水敏反应使得Y砂岩液体渗透率降低,且水敏反应影响更大.滑脱因子b与Klinkenberg渗透率k_(∞)的关系均符合简单的经验模型,而考虑了试块孔隙度的经验关系式b=a(k_(∞)/φ)^(-n)比未考虑孔隙度的经验公式b=ak_(∞)^(m)更适用于描述不含黏土的枫丹白露砂岩和孔喉结构复杂的Y砂岩.Permeability is regarded as a rock specific property, reflecting the reservoir quality during oil and gas production. It has been widely reported that liquid permeability is smaller than the Klinkenberg-corrected gas permeability that measured from the same core samples. To investigate the impact of clay minerals on permeability and slippage factor, N_(2) and brine permeability results collected from 30 pieces of “clean” sandstones(with rare clay minerals) from the Fontainebleau Formation and 30 pieces of clay-rich Y sandstones are compared. The results illustrate that the average values of Klinkenberg-corrected gas permeability are lower than the liquid permeability measured by brine. Further, the deviations between gas and liquid permeability are more obvious for Y sandstones. For brine-saturated cores, liquid films are generated inside of pore walls, reducing the size of the effective radius in the flow system. In addition, the impacts of water sensitivity are enhanced during liquid-rock interaction in clay-rich samples. Based on the experimental results, the relationships between slippage factor b and the Klinkenberg-corrected gas permeability(k_(∞)) follow the simple empirical model. In general, the empirical equation after considering the effect of sample porosity b=a(k_(∞)/φ)^(-n);is more applicable to both Fontainebleau and Y sandstones, compared to b=ak_(∞)^(m).

关 键 词：枫丹白露砂岩 Klinkenberg渗透率 滑脱因子 液体渗透率 黏土矿物 

分 类 号：P631[天文地球—地质矿产勘探]