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STUDY ON SEDIMENTARY SYSTEM OF THE YANCHANG FORMATION (TRIASSIC) IN THE CHANGWU AREA, THE ORDOS BASIN

ZHAO Xian-chao1,TIAN Jing-chun1,WANG Feng2,XIAO Ling2(1.Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,Sichuan,China;2.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,Sichuan,China)  
Based on the core observation,well logging and test results,this paper made a systematic and thorough study of the types of sedimentary systems of the Triassic Yanchang Formation in the Changwu area.Braid river,braid delta and lake were found to be three major sedimentary systems developed in the studied area.The braid river delta is made up of braid delta plain,braid delta front and frontier braid river delta.A sedimentary model was established after the features of all sorts of sedimentary systems and their planar distribution having been discussed in detail.
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