Grading evaluation of shale oil reservoirs in the 4th member of Shahejie Formation in Leijia area of Liaohe Depression
Aiming at the grading evaluation of shale oil reservoirs in the fourth member of Shahejie Formation in Leijia area,by using scanning electron microscopy,nitrogen adsorption,high pressure mercury injection and reservoir classification evaluation methods,the pore throat characteristics and classification evaluation are analyzed.The results indicate that pores of the Sha 4 shale oil reservoirs in Leijia area can be divided into three categories:large pores,medium pores,and small pores.Carbonate shale oil reservoirs can be classified into three grades and five types.Combined with the division of hydraulic flow units,the planar distribution characteristics at different grades have been clarified.As for the grade Ⅰ reservoirs,the thick-ness center of Dusan layer is in the middle,of Gaosheng layer is in the northeast.
Leijia areashale oillower limit of physical propertygrading evaluationreservoir classifica-tion