摘要
微观孔隙结构特征是当前页岩气储层研究的核心问题,目前的研究大多是针对单一影响因素的总结。从岩石学、沉积学和有机地球化学的角度,总结不同类型页岩及其储层微观孔隙结构的成因及差异。结果表明:不同沉积环境下形成的页岩在经历了一系列后生成岩改造及烃源岩热演化的影响后,其储层微观孔隙结构表现出极大差异。沉积环境决定微观孔隙形成的物质基础,如页岩中总有机碳、脆性矿物和粘土矿物的含量;成岩演化不同阶段微观孔隙结构的类型和发育程度各不相同;有机质热演化对微观孔隙结构的影响主要表现为,随着成熟度增加,有机质孔大量形成,粘土矿物的转化使储层的比表面积和孔隙体积发生变化。在多因素系统总结的基础上,提出沉积环境、成岩演化和热演化对微观孔隙结构的"三元"耦合控制作用,并分析不同演化阶段其主要的控制端元。
The research of microscopic pore structure characteristics is the core issue of shale gas reservoir,and the summa-ry of influencing factor is mainly based on single factor analysis.The causes and differences of different types of shale gas reservoir and its microscopic pore structure were summarized from the aspects of petrology,sedimentology and organic geo-chemistry.The result shows that shales formed in different sedimentary environments have very different microscopic pore structure after a series of diagenetic and thermal evolution.The sedimentary environment determines the content of TOC,brittle minerals and clay minerals in shale,which is the material foundation for the formation of microscopic pores.The types and development degree of microscopic pore structure vary with diagenetic evolution stages of shale.The influence of thermal evolution on microscopic pores shows that a large amount of organic matter pores occur with the increase of maturi-ty and the specific surface area and pore volume will change with the transformation of clay minerals.Based on multi-fac-tor analysis,three-element coupled control on microscopic pore structure was proposed including sedimentary environ-ment,diagenetic evolution and thermal evolution,and the mainly controlling elements at different evolution stages were al-so analyzed.
作者
葛岩
万欢
黄志龙
潘新志
仲米剑
GE Yan;WAN Huan;HUANG Zhilong;PAN Xinzhi;ZHONG Mijian(CNOOC Enter Tech-Drilling&Production Company,Tianjin City,300457,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing City,102249,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2018年第5期17-23,共7页
Petroleum Geology and Recovery Efficiency
基金
国家自然科学基金项目"湖相富有机质泥页岩自生石英形成及其页岩油地质意义"(41272156)
中国海洋石油总公司重大科研项目"致密砂岩气产能指数及预测方法研究"(E-J616D006)
关键词
页岩气储层
微观孔隙结构
沉积环境
成岩演化
“三元”耦合
shale gas reservoir
microscopic pore structure
sedimentary environment
diagenetic evolution
three-element coupling
作者简介
葛岩(1984—),男,山西大同人,高级工程师,博士,从事非常规油气资源评价方面的研究。联系电话:15122509983,E-mail:geyan@cnooc.com.cn。;通讯作者:万欢(1969—),男,贵州同仁人,高级工程师,硕士。联系电话:13820608639,E-mail:wanhuan@cnooc.com.cn。
