松南地区青山口组页岩微观孔隙结构特征研究  

Micro-pore structure characteristics of Qingshankou Formation shale in southern Songliao Basin

作　　者：刘佳薇 汤济广[1] 王建伟[2] 刘笑楠 佟歆瑶 黄浩 Liu Jiawei;Tang Jiguang;Wang Jianwei;Liu Xiaonan;Tong Xinyao;Huang Hao(Yangtze University,Wuhan,Hubei 430100;Research Institute of Exploration and Development,Jidong Oilfield Company,PetroChina,Tangshan,Hebei 063004)

机构地区：[1]长江大学,湖北武汉430100 [2]中国石油冀东油田分公司勘探开发研究院,河北唐山063004

出　　处：《资源环境与工程》2024年第6期647-657,共11页Resources Environment & Engineering

基　　金：大学生创新创业训练计划项目(YZ2022015)。

摘　　要：储层孔喉结构是陆相页岩油研究的重点,其决定了储层物性特征。以松南地区青山口组页岩储层为研究对象,通过高压压汞、恒速压汞和CT扫描实验,联合表征青一段、青二段和青三段页岩储层的储集空间类型、孔喉半径分布、连通性等。结果表明,松南地区青一段和青三段孔隙连通性较好,青二段孔隙连通性较差,其中青一段页岩的孔隙度为5.0%~18.9%,渗透率为0.025~0.886 mD,平均孔喉半径为47.8~235.4 nm,中值孔喉半径为4.4~254.5 nm;青二段页岩的孔隙度为2.4%~5.3%,渗透率为0.022~1.550 mD,平均孔喉半径为10.8~26.4 nm,中值孔喉半径为4.7~5.1 nm;青三段页岩的孔隙度为8.1%~12.9%,渗透率为0.076~0.347 mD,平均孔喉半径为107.7~233.4 nm,中值孔喉半径为105.5~308.0 nm。对青山口组储层物性进行分级评价,可知大安地区青一段主要发育Ⅱ级、Ⅲ级储层和中孔喉,储层物性较好;塔虎城地区青二段主要发育Ⅲ级储层和小孔喉,储层物性差;新北地区青三段主要发育Ⅰ级、Ⅱ级储层和中孔喉,储层物性好。研究结果可用于评价青山口组页岩油气藏资源潜力,为松辽盆地青山口组及类似地区页岩孔隙结构的定量表征和评价提供参考。The pore-throat structure of reservoir is the focus of continental shale oil research,which determines the physical properties of reservoir.In this paper,the shale reservoir of Qingshankou Formation in Songnan area is studied.The reservoir space type,pore-throat radius distribution and connectivity of the shale reservoirs of Qing 1st,Qing 2nd and Qing 3rd Members are characterized by high pressure mercury injection,constant velocity mercury injection and CT scanning.The results show that the pore connectivity of Qing 1st and Qing 3rd Members in Songnan area is good,and the pore connectivity of Qing 2nd Member is poor.The porosity of Qing 1st Member is 5.0%-18.9%,the permeability is 0.025-0.886 mD,the average pore-throat radius is 47.8-235.4 nm,and the median pore-throat radius is 4.4-254.5 nm.The porosity of Qing 2nd Member is 2.4%-5.3%,the permeability is 0.022-1.550 mD,the average pore-throat radius is 10.8-26.4 nm,and the median pore-throat radius is 4.7-5.1 nm.The porosity of Qing 3rd Member is 8.1%-12.9%,the permeability is 0.076-0.347 mD,the average pore-throat radius is 107.7-233.4 nm,and the median pore-throat radius is 105.5-308.0 nm.The reservoir physical properties of Qingshankou Formation are graded and evaluated.It can be seen that Qing 1st Member in Da an area mainly develops gradeⅡand gradeⅢreservoirs and medium pore-throats,and the reservoir physical properties are good.Qing 2nd Member in Tahucheng area mainly develops grade III reservoir and small pore-throat,and the reservoir physical properties are poor.Qing 3rd Member in Xinbei area mainly develops gradeⅠand gradeⅡreservoirs and middle pore-throats,and the reservoir physical properties are very good.The research results can be used to evaluate the resource potential of shale oil and gas reservoirs in Qingshankou Formation,and provide reference for quantitative characterization and evaluation of shale pore structure in Qingshankou Formation and similar areas in Songliao Basin.

关 键 词：松辽盆地 青山口组 孔隙结构 CT扫描 高压压汞 恒速压汞 

分 类 号：P618.13[天文地球—矿床学]