1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Key Laboratory for Oil Shale and Coexisting Minerals of Jilin Province, Changchun 130061, China;
3. Key Laboratory for Mineralization, Exploration and Exploitation of Oil Shale and Paragenetic Energy Minerals, Changchun 130061, China;
4. Oil & Gas Survey, China Geological Survey, Beijing 100029, China

In this paper, the geochemical characteristics of REE from shale member of Shimengou Formation in Well YYY-1 have been analyzed, which illustrated the significance of paleoenvironment, paleoprovenance and paleoclimate, and revealed the impact on oil shale mineralization. The results show that the total content of REE(��REE)of shale member of Shimengou Formation varied from 139.16×10^-6 to 342.59×10^-6 with an average at 236.66×10^-6, which is higher than the content of NASC and PASS. Geochemical parameters such as the ratios of ��LREE/��HREE, (La/Yb)_N indicate an obvious differentiation of ��LREE and ��HREE. The REE distribution patterns show that LREE is obviously richer than HREE. Geochemical parameters and La/Yb-��REE diagram suggest that the paleoprovenance was a mixture of sedimentary and volcanic rocks from the upper crust. Eu is obviously negative abnormality, indicating that the sediment was formed in anoxic environment suggesting that anoxic environment is in favour of the organic matter of oil shale enrichment. According to the high levels of ��REE and ��Eu abnormal value, combined with previous research results based on sporopollen, the shale member of Shimengou Formation formed in the warm and humid climate conditions, which provided a good source of material and preservation conditions for the oil shale.