Sweet spot evaluation and exploration practice of lacustrine shale oil of the second member of Kongdian Formation in Cangdong sag, Bohai Bay Basin

HAN Wenzhong,ZHAO Xianzheng,JIN Fengming,PU Xiugang,CHEN Shiyue,MU Liangang,ZHANG Wei,SHI Zhannan,WANG Hu

Table 3 Geologic evaluation standard of shale oil sweet spots.

Class Evaluation indexes S1/ (mg•g-1) Rhythmic structure Vc/% TOC/% ϕ/% a ≥4 Lamina ≤20 2≤TOC<6 ≥6 b 2≤S1<4 Thin layer 20≤Vc<30 ≥6 4≤ϕ<6 c 1≤S1<2 Layer 30≤Vc<40 1≤TOC<2 2≤ϕ<4