1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Key-Laboratory for Oil Shale and Coexisting Minerals��Jilin University��Changchun 130061��China; 3. Geological Science ��esearch Institute of Shengli Oilfield��SINOPEC��Dongying 257015��Shandong��China

content with high ash in type��and its organic matter is immature�� Meanwhile kaolinite and illite are the main clay minerals in Meihe oil shale��enriched by stabilizing components such as quartz�� Elements in Meihe oil shale like U��Mo are relatively rich��and its heave and light ��EE is high in differentation degree�� Oil shale deposited over the coal layers in mutation��covered by the dark gray mudstone��which indicates that the oil shale developed in semi-deep and deep lake environment�� Sr/Ba value and gammacerane value are lower��and V/ (V + Ni) value is greater than 0. 5��which indicates the oil shale forming in anoxic freshwater�� The sources of organic matter in oil shale are more complex��such as high TOC content black oil shale containing mainly high plants with low oil production rate (oil content/ TOC)��and relatively low TOC content of brown oil shale having much more aquatic organic matter with high oil production rate��