mainly developed as a semi-deep to deep lacustrine mudstone and shale. It is the main oil-
rich source bed for the Mesozoic reservoir in the basin. Compared with North American
marine shale oil, the Chang 7 shale oil has diverse sedimentary facies, poor stratigraphic
continuity and strong reservoir heterogeneity, and its enrichment and distribution
characteristics are more complicated. The fine scale core descriptions of the Chang 7 …