四川盆地涪陵地区五峰组-龙马溪组页岩孔隙特征及演化模式  

Pore Characteristics and Evolution Model of Shale in Wufeng-Longmaxi Formation in Sichuan Basin

作　　者：胡德高[1] 万云强[1] 方栋梁 叶鑫 徐向[1] 邢磊[2] 崔志恒 张洪茂 Hu Degao;Wan Yuqiang;Fang Dongliang;Ye Xin;Xu Xiang;Xing Lei;Cui Zhiheng;Zhang Hongmao(SINOPEC Jianghan Oilfield Company, Qiangjiang 433124,China;The Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Ocean University of China, Qingdao 266100,China)

机构地区：[1]中国石化江汉油田分公司,湖北潜江433124 [2]中国海洋大学海底科学与探测技术教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2021年第10期80-88,共9页Periodical of Ocean University of China

基　　金：山东省重点研究发展计划项目(2019GHY112019);中央高校基本科研业务费项目(201964016);中国石化“十条龙”重大科技攻关项目(2018P18052);国家科技重大专项项目(2016ZX05060,31400970-19-ZC0609-0001)资助。

摘　　要：本文以四川盆地涪陵地区五峰组-龙马溪组富有机质页岩为研究对象,通过FE-SEM扫描电镜、高压压汞、低温N2吸附和低温CO_(2)吸附相结合的方法对页岩孔隙结构特征进行表征,明确了页岩孔隙发育的主控因素,并探讨了页岩孔隙演化特征。研究认为龙马溪组页岩微观孔隙类型以有机质孔隙为主,页岩气吸附的主要场所是纳米级微孔和中孔。页岩储层孔隙结构主要受控于有机质含量和矿物组分,较高有机质含量、硅质页岩相为有利的孔隙发育条件。页岩中孔隙演化主要是有机孔演化。有机质热演化程度对页岩孔隙的控制作用明显,有机质孔隙度在镜质体反射率约为1.8%时达到最大值,适中的热演化程度对页岩孔隙发育最为有利。Shale porosity is the key factor determining the content of adsorbed gas.In this paper,taking the organic-rich shale of the Wufeng-Longmaxi Formation in the Fuling area of Sichuan Basin as the research object,the characteristics of pores in shale structure were characterized by a combination research of FE-SEM scanning electron microscopy,high-pressure mercury experiment,low-temperature N2 adsorption experiment and low-temperature CO_(2) adsorption experiment.The main controlling factors of pores in shale in shale development are clarified,and the characteristics of shale pores in shale evolution are discussed.The micropores of the shale in Longmaxi Formation are mainly organic matter pores,and the main sites of shale gas adsorption are nanoscale micropores and mesopores.The pore structure of shale reservoir is mainly controlled by organic matter content and mineral composition,and there are many favorable pore development conditions,such as higher organic matter content,siliceous shale facies.The evolution of pores in shale is mainly organic matter pore evolution.The pores in shale are obviously controlled by the degree of thermal evolution of organic matter,the porosity of organic matter reaches its maximum value when the vitrinite reflectivity is about 1.8%.The moderate degree of thermal evolution is most beneficial to the development of pores in shale.

关 键 词：四川盆地 页岩孔隙 孔隙类型 演化模式 有机质孔隙 

分 类 号：P618.13[天文地球—矿床学]