Limits and grading evaluation criteria of tight oil reservoirs in typical continental basins of China

ZHOU Nengwu,LU Shuangfang,WANG Min,HUANG Wenbiao,XIAO Dianshi,JIAO Chenxue,WANG Jingming,TIAN Weichao,ZHOU Lei,CHEN Fangwen,LIU Wei,WANG Zhixuan

Fig. 4. Mechanical balance method for obtaining the theoretical upper limit of the tight reservoir of the Lower Cretaceous Quantou Formation, Songliao Basin. (a) Determination of the upper limit of the critical throat radius of tight rock; (b) Relationship between throat radius and permeability; (c) Relationship between porosity and permeability.