The pore-throat structure of reservoir is the focus of continental shale oil research,which determines the physi-cal 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 scan-ning.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 grade Ⅱand grade Ⅲreservoirs 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 grade Ⅱ reservoirs 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.
维普
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