Sedimentary characteristics of the lower Permian in Ordos Basin and its adjacent areas
Guo Yan-Qin1, Zhao Ling-Sheng1, Guo Bin-Cheng2, Fei Shi-Xiang3, Li Wen-Hou4, Zhang Qian4, Yuan Zhen1, Ma Yao1, He Zi-Qiong1, Li Bai-Qiang5
1 School of Earth Sciences and Engineering,Xi'an Shiyou University,Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi'an 710065,China; 2 Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China; 3 Research Institute of Petroleum Exploration and Development,PetroChina Changqing Oilfield Company,Xi'an 710018,China; 4 Department of Geology/State Key Laboratory of Continental Dynamics, Northwest University,Xi'an 710069,China; 5 School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China
Abstract Based on the extensive field profile observation and detailed description of drilling cores in the basin,rock type and texture,sedimentary structure,paleontological fossils and logging curve response characteristics are analyzed to reveal the sedimentary characteristics of the lower Permian Taiyuan and Shanxi Formations in Ordos Basin and its adjacent areas. The result shows that the main sedimentary environments of the Taiyuan Formation are shelf,coast,alluvial fan and delta,in which the coastal sedimentary facies includes barrier island,lagoon and tidal flat. The delta facies can be divided into delta plain,delta front and prodelta. Alluvial fan,river,meandering river delta,lacustrine and coast are the main sedimentary facies in the Shanxi Formation. Fluvial facies includes braided and meandering river deposits,and the later can be divided into meandering river delta plain,meandering river delta front and prodelta deposits. The lacustrine is dominated by shallow lake deposits and the coast is dominated by lagoon deposits. During the Taiyuan sedimentary period,the marine sediments are dominant and distribute in a wide area to the south of Yinchuan and Yulin. The sedimentary environment has transitioned from shallow sea shelf in the eastern and western area,to lagoon and tidal flat in the central area,with barrier island developed in the middle. Alluvial fan and fan delta deposits are developed in the northwestern margin of the basin,and delta deposits are dominant in the vast areas of the north. The delta facies has changed from delta plain to delta front from north to south. During the sedimentary period of Shanxi Formation,sea water receded from the southeast part of the basin and evolved into marine continental transitional facies. Generally,the sedimentary environment has changed from alluvial fan(Wuda-Hangjinqi-Ordos area of the northern basin of basin),to braided and meandering river(Wuda-Hangjinqi-Ordos extend southward to Jingbian area),to delta plain(Jingbian to Yan'an), delta front(extend southward to Tongxin-Jingbian area), and to shallow lake(Pengyang-Jingyang area in the south of the basin). To the south of Pengyang-Jingyang area,the shallow lake deposited were replaced by delta deposits due to the sediment flux from the southern basin margin. The southern part of the Ordos Basin,Wuxiang-Yima area,was lagoon environment.
Fund:Co-funded by the National Science and Technology Major Project of China(No.2017ZX05005002-004),the Significant Petroleum Special Projects of China(No.2016ZX05046-002),the Major Program of the National Natural Science Foundation of China(Nos.41390451,41330315),the Youth Project of the National Natural Science Foundation of China(No.41502107),the Mineral Resources Investigation and Evaluation Project of China Geological Survey Bureau(No.121201011000150014)and the Basic Research Project of the Shaanxi Natural Science(No.2017JQ4018)
Corresponding Authors:
Li Wen-Hou,born in 1948,is a professor and Ph.D. supervisor. He is engaged in sedimentology research. E-mail: liwenhou@263.net.
About author: Guo Yan-Qin,born in 1972,is a master supervisor. She is a professor and engaged in researches of sedimentology and reservoir geology. E-mail: guoyanqin@xsyu.edu.cn.
Cite this article:
Guo Yan-Qin,Zhao Ling-Sheng,Guo Bin-Cheng et al. Sedimentary characteristics of the lower Permian in Ordos Basin and its adjacent areas[J]. JOPC, 2021, 23(1): 65-80.
Guo Yan-Qin,Zhao Ling-Sheng,Guo Bin-Cheng et al. Sedimentary characteristics of the lower Permian in Ordos Basin and its adjacent areas[J]. JOPC, 2021, 23(1): 65-80.
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