Research Institute of Petroleum Exploration and Development;
PetroChina;
Beijing 100083;
China;
State Key Laboratory of Enhanced Oil Recovery;
Beijing 100083;
China;
School of Earth Resources;
China University of Geosciences;
Wuhan 430074;
China;
Institute of Porous Flow and Fluid;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
Changqing Oilfield Company;
PetroChina;
Xi’an 710018;
China;
Shale oil system; Hydrocarbon accumulation unit; Hydrocarbon generation unit; Hydrocarbon retention unit; Differentiated enrichment; Sweet spots window; Pore-throat network; Throat direction;