Lithofacies paleogeography maps of Paleogene System at Shahejie Formation 3rd Middle sub-member in Jizhong depression

The stratum of Paleogene System at Shahejie formation 3rd Middle sub-member in Jizhong depression is universal distribution. On the base of the welldrilling, core and quake data etc. as characterization and quantification, the lithofacies paleogeography maps of Paleogene System at Shahejie formation 3rd Middle sub-member in Jizhong depression are compiled with the single factor analysis and multifactor comprehensive mapping method proposed by Feng Zengzhao Prof‥ The stratum of Paleogene System at Shahejie formation 3rd Middle sub-member mainly develops some sedimentary facies including alluvial fan, stream, (fan) braided river delta, sublacustrine fan in shore and lake. The result of research shows that the sequence stratum mainly develop umbrella alluvial fan-stream-(fan)braided river delta-lake sedimentary system. Jizhong depression of Paleogen System had gone through the two phases of sedimentary evolvement for the deposit (SQ3) of fault expansive up to the chin age for basin in earlier Eocene Series.