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. 3. Oil test productivity method for obtaining the lower limit of physical properties of tight oil reservoirs in typical continental basins in China. (a) Relationship between porosity of tight oil reservoir and the oil recovery index, Upper Cretaceous Qingshankou Formation, North Songliao Basin; (b) Relationship between porosity of tight oil reservoir and the oil recovery index, Lower Cretaceous Quantou Formation, South Songliao Basin; (c) Difference between porosity of oil, oil-water layers, and the dry layer, Paleogene Funing Formation, North Jiangsu Basin; (d) Relationship between permeability of tight oil reservoir and the oil recovery index, Upper Cretaceous Qingshankou Formation, North Songliao Basin; (e) Relationship between permeability of tight oil reservoir and the oil recovery index, Lower Cretaceous Quantou Formation, South Songliao Basin; (f) Relationship between permeability of tight oil reservoir and the oil recovery index, Paleogene Funing Formation, North Jiangsu Basin.