1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China

The sedimentary facies of Chengzihe and Muling formations of Early Cretaceous coal-bearing strata in Shuangyashan Basin were studied via petrography, grain-size analysis and borehole data analysis. Based on the sedimentary characteristics and temporal and spatial distribution of the sedimentary facies, sedimentary facies of the Early Cretaceous Chengzihe and Muling formations were mapped. The results suggest that fan delta and lacustrine are the major facies developed, which include fan delta plain, shallow lake and multi-layered marsh coal. For the period from the Chengzihe to the Muling Formation, the sedimentary basin expanded with lake basin migrating to the northeast. The period of the Chengzihe Formation represents a period of growth for delta plain deposits and coal accumulation, whereas Muling Formation represents the development of lacustrine deposits, consisting of mudstone and a few thin coal seams.