页岩储层泛连通特征及气体赋存方式  

Pan-connected characteristics and occurrence modes of gas in shale reservoirs

作　　者：刘德华[1,2,3] 程亮 孙敬[1,2,3] 孙健 张柏桥[3,4] 李继庆 杨文新[3] 郑爱维 Liu Dehua;Cheng Liang;Sun Jing;Sun Jian;Zhang Baiqiao;Li Jiqing;Yang Wenxin;Zheng Aiwei(School of Petroleum Engineering,Yangtze University,Hubei Wuhan 430100,China;Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering,Hubei Wuhan 430100,China;Hubei Engineering Research Center for Shale Gas Development,Hubei Wuhan 430100,China;Exploration and Development Research Institute,Sinopec Jianghan Oilfield Company,Hubei Qianjiang 433124,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]湖北省油气钻采工程重点实验室,湖北武汉430100 [3]湖北省页岩气工程研究中心,湖北武汉430100 [4]中国石油化工股份有限公司江汉油田分公司勘探开发研究院,湖北潜江433124

出　　处：《石油学报》2021年第9期1192-1201,共10页Acta Petrolei Sinica

基　　金：国家科技重大专项(2016ZX05060-009,2016ZX05060-019);中国石油科技创新基金项目(2020D-5007-0209)资助。

摘　　要：目前对页岩储层微观孔隙的连通特征、气固作用关系认识尚有不足,对纳米级空间(尺度为0.5~4.0 nm)在气体储集、流动中的作用没有开展系统研究。通过透射电子显微镜观察到页岩储层固体矿物颗粒内部存在大量纳米级空间,并通过实验证实镜下观察到的纳米级空间对甲烷气体具有可通过性、可存储性;基于观察和实验结果提出了页岩储层泛连通的概念;提出页岩气新的储集形态——固溶气,将页岩气的储集方式分为自由气、吸附气、固溶气、溶解气4种;依据新的认识给出实际页岩气储量计算新公式,实际计算得到页岩气储集量增加7%~32%。该认识和结论同样可应用于高温高压致密气藏,可以形成基于泛连通和固溶气概念的页岩储层微观评价和渗流机理的理论体系。At present, there is still insufficient understanding of the intercommunication characteristics and the gas-solid interaction of microcosmic pores in shale reservoirs, and no researches have been carried out on the role of micro-nano-scale space(with the size scale of 0.5-4 nm)in gas storage and flow. Using transmission electron microscopy(TEM), plenty of micro-nano-level space is observed in the solid mineral particles of shale reservoirs, and experiments have confirmed that the micro-nano-level space observed under TEM can transfer and store methane gas. Based on observations and experiment results, this paper initially proposes the idea of the pan-connectivity of shale reservoirs, puts forward a new reservoiring mode in shale, i.e., gas-solid solution gas, and divides the reservoir modes of shale gas into four types: free gas, adsorbed gas, solid solution gas, and dissolved gas. Based on the new understanding, a new formula is proposed for calculating actual shale gas reserves, and are increased by 7% to 32% according to the example calculation results. The understanding and conclusions obtained can also be applied to high-temperature and high-pressure tight gas reservoirs, and can form a theoretical system of the microscopic evaluation and seepage mechanism of shale reservoirs based on the concepts of pan-connectivity and solid solution gas.

关 键 词：页岩气 固溶气 泛连通 微纳空间 黏土矿物 

分 类 号：TE311[石油与天然气工程—油气田开发工程]