油气藏地质及开发工程国家重点实验室，成都理工大学，四川成都，610059,油气藏地质及开发工程国家重点实验室，成都理工大学，四川成都，610059,油气藏地质及开发工程国家重点实验室，成都理工大学，四川成都，610059,中国石化胜利油田分公司勘探开发研究院，山东东营，257000,中国石化胜利油田分公司勘探开发研究院，山东东营，257000,中国石化胜利油田分公司勘探开发研究院，山东东营，257000
State Key Lab. of Oil and Gas Reservoir Geology and Exploitation, CDUT,State Key Lab. of Oil and Gas Reservoir Geology and Exploitation, CDUT,State Key Lab. of Oil and Gas Reservoir Geology and Exploitation, CDUT,Exploration and Development Research Institute of Shengli Oilfield, SINOPEC,Exploration and Development Research Institute of Shengli Oilfield, SINOPEC,Exploration and Development Research Institute of Shengli Oilfield, SINOPEC
通过场发射环境扫描电镜、低温氮气吸脱附实验、高分辨率背散射电子图像定量分析等技术方法，对渤海湾盆地东营凹陷沙河街组页岩油储层的微观孔隙类型、结构特征及孔隙分布进行了系统研究。结果表明：沙河街组页岩油储层微观孔隙类型多样，包括粒间孔、粒内孔、晶间孔、溶蚀孔和晶内孔5类孔隙。有利储集空间为孔径在100~3000nm的孔隙，以粒间孔、粒内孔和溶蚀孔为主。泥岩类和灰岩类孔隙形态包括墨水瓶状和平行板状；白云岩类孔隙形态为平行板状，连通性最好。白云岩类定量面孔率最大且孔隙发育最好，其次为泥岩类，灰岩类较差。影响微观孔隙特征的主要因素包括矿物成分及含量、有机质生排烃和热液作用，其中粘土矿物和泥级颗粒有利于储层微孔发育，方解石的胶结作用和重结晶作用不利于孔隙发育。生排烃产生的有机酸和热液作用增进了次生孔隙的形成。
Micro-pore type, pore distribution and structure characteristics of shale oil reservoir on Shahejie Fm. in Dongying Sag , Bohai Bay Basin, were studied by using a field-emission environmental scanning electron microscope, low-temperature nitrogen adsorption experiment and high-resolution quantitative analysis backscattered electron image. The results indicated that the matrix pores of Shahejie Fm. shale oil reservoir contain five types: inter-particle pores, intra-particle pores, inter-crystal pores, dissolved pores and intra-crystal pores. Favorable reservoir spaces of shale oil reservoirs are the pores in 100~3000nm diameter. Inter-particle pores, intra-particle pores and dissolved pores are predominant. The pore of mudstone and limestone contain the inkwell shape and the parallel-plate shape. Dolomite pore is mainly the parallel-plate shape and has best connectivity. Quantitative Plane Porosity and pore development of dolomite was larger than that of mudstone and Plane Porosity of mudstone was larger than that of limestone. Mineral composition and content, hydrocarbon discharge and hydrothermal process are believed the main factors to affect micro-pore characteristics. The clay minerals and clay-size particles are conductive to shale micro-pore development. Cementation and recrystallization of calcite are not conducive to pore development. Organic acid with hydrocarbon discharge and hydrothermal process are conductive to develop mineral secondary pores.
刘毅,陆正元,冯明石,王军,田同辉,晁静.2017.渤海湾盆地东营凹陷沙河街组页岩油储层微观孔隙特征[J].地质学报,91(3):629-644.
Liu Yi, Lu Zhegnyuan, Feng Mingshi, Wang Jun, Tian Tonghui, Chao Jing.2017. Micro-pore Characteristics of Shale Oil Reservoirs of the Shahejie Formation in the Dongying Sag, Bohai Bay Basin[J]. Acta Geologica Sinica,91(3):629-644.
