State Key Laboratory of Petroleum Resources and Prospecting University of Petroleum 102249;
China National Petroleum Corporation 100007;
Research Institute of Petroleum Exploration&Development 100083;
PetroChina Qinghai Oilfield Company 736202;
Qaidam Basin; Qaidam Western Depression; Paleogene Lower Ganchaigou Formation; saline lake; low TOC value; shale oil; dissolved organic matter; high efficient hydrocarbon generation; hydrocarbon generation model; organic matter abundance;