渤海湾盆地沾化凹陷页岩微观孔隙特征实验研究

Micro-pore characteristics of shale in Zhanhua Sag, Bohai Bay Basin

马海洋 夏遵义 温庆志 张鹏宇

MA Haiyang XIA Zunyi WEN Qingzhi ZHANG Pengyu

1. 中国石油大学(华东) 石油工程学院, 山东 青岛 266580; 2. 北京大学 工学院, 北京 100871; 3. 北京大学 工程科学与新兴技术高精尖创新中心, 北京 100871

1. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. College of Engineering, Peking University, Beijing 100871, China; 3. Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing 100871, China

页岩的微观孔隙结构是影响页岩油气富集与渗流机理的关键。利用氩离子抛光扫描电镜、低温CO2吸附、低温N2吸附、高压压汞及核磁共振等实验方法，对沾化凹陷沙河街组陆相页岩的微观孔隙特征进行了研究。页岩主要发育有机孔、粒间孔、粒内孔、晶间孔、溶蚀孔和微裂缝等6类孔隙。其中微孔、中孔和宏孔均有发育，微孔比表面积约占总比表面积的61.52%，提供了页岩油气吸附的主要空间，而中孔和宏孔则提供了大部分孔体积，分别占比49.99%和41.19%，对页岩油气的储集和运移起主要作用；页岩孔隙度为4.08%~7.04%，有效孔隙度为0.11%~0.64%，孔隙连通性差。

The micro-pore structure of shale is a key contol of shale oil and gas accumulation and seepage. The micro-pore structure of the continental shale in the Shahejie Formation in the Zhanhua Sag was analyzed by using argon-ion polishing SEM, CO2 adsorption, N2 adsorption, MIP and NMR. The shale displays six kinds of pores, including organic, intergranular, intragranular, intercrystalline, dissolution pores and micro-cracks. Micropores, mesopores and macropores are all developed. The micropore specific surface area accounts for about 61.52% of the total specific surface area, providing the main space for shale oil and gas adsorption. The mesopores and macropores provide most pore volume, accounting for 49.99% and 41.19%, respectively, which play a major role in the storage and migration of shale oil and gas. The shale porosity is 4.08%-7.04% and the effective porosity is 0.11%-0.64%, which means that pore connectivity is poor.

国家科技重大专项“东部断陷盆地页岩油气赋存方式与富集规律研究”（2016ZX05034001-007）资助。

https://doi.org/10.11781/sysydz201901149