松辽盆地青山口组页岩的压汞孔隙结构及其地质意义  

Pore structure of Qingshankou Formation shales in Songliao Basin and its geological significance

作　　者：曾维主 宋之光[1] 周国议 ZENG Weizhu;SONG Zhiguang;ZHOU Guoyi(State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广东广州510640 [2]中国科学院大学,北京100049

出　　处：《中国石油大学学报（自然科学版）》2021年第6期35-41,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金创新研究群体项目(41621062)。

摘　　要：对松辽盆地青山口组页岩样品进行高压压汞测试,按墨水瓶孔喉模型计算页岩的孔喉比,分析页岩的孔隙结构参数对含油率的影响。结果表明:青山口组页岩的孔隙度为5.0%~8.0%,平均孔径为7.2~13.5 nm,平均孔喉比为4.9~36.2;页岩的汞滞留量为61%~84%,页岩的孔隙连通性整体较差;页岩以纳米孔隙为主,微米孔隙较少;纳米孔隙的孔喉比较小,孔隙连通性较好,微米孔隙的孔喉比较大,孔隙连通性较差;微米孔隙为页岩油的有效储集空间,纳米孔隙为页岩油在基质孔隙内运移的主要通道。To study the influence of pore structure on shale oil accumulation,the pore structures of shales from Qingshankou Formation in Songliao Basin were determined by the mercury intrusion capillary pressure(MICP)method and the pore-throat ratio was calculated according to ink-bottle pore model.The results show that the porosity of these shales vary from 5.0%to 8.0%,the average pore size and pore-throat ratio are in a range of 7.2-13.5 nm and 4.9-36.2,respectively.The Hg-retained ratio is between 61%and 84%,indicating the poor connectivity of shale pores.The shales are dominated by nanoscale pores,and contain a small amount of micronscale pores.The nanoscale pores show a smaller value of pore-throat ratio and have a relatively good pore connectivity,while the micronscale pores display a larger value of pore-throat ratio and have a relatively poor pore connectivity.It is considered that the micronscale pores could be considered as the primarily store space of shale oil and the nanoscale pores act as the major pore-throats for shale oil accumulation.

关 键 词：压汞法 页岩油 孔喉比 青山口组 松辽盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]