Tectono-climatic-sedimentary evolution and coupling mechanism during the middle Permian-early Triassic in Bogda area,Xinjiang
Shi Yan-Qing1,2, Wang Jian3, Zhang Guo-Yi4, Liu Ming3, Xiang Peng-Fei1,2, Yang Zhi-Bo1,2, Ji Han-Cheng1,2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 3 Research Institute of Experiment and Detection,PetroChina Xinjiang Oilfield Company,Xinjiang Karamay 834000,China; 4 Exploration & Development Research Institute, PetroChina Jilin Oilfield Company, Jilin Sonyuan 138000, China
Abstract：The evolution of the basin-mountain relationship,the initial uplift time of Bogda Mountain,and the tectonic-climate-sedimentary coupling mechanism have been the research issues,and have been restricting the process of oil and gas exploration and development in the southeastern margin of the Junggar Basin. This work uses the outcrops in north rim of the Bogda Mountain,cores,seismic,drilling and logging data of the Fukang and Jimusar sag to illuminate the middle Permian-lower Triassic stratigraphic distribution,characteristics of sedimentary facies,and climate change in the Bogda region. Based on above research,a tectono-climate-sedimentary evolution of the middle Permian to early Triassic can be rebuilt. In the middle Permian,the Bogda area was characterized by a rift-depression tectonic setting,an arid and semi-arid climate,and a braided river delta-lacustrine sedimentary system in the basin center. In the late Permian,the Bogda Mountain was uplifted initially,the early lake basin died out and replaced by alluvial fans in front of the north slope of the Bogda Mountain. The paleoclimate changed from semi-arid to semi-humid. In the early Triassic,the tectonic background of the Bogda region was relatively stable,but the paleoclimate gradually became warm and humid,which played a major role in affecting the regional weathering degree and sedimentary process. The Bogda Mountain underwent intense weathering and denudation,and the fan delta-lake sedimentary system was formed on its north side in this period.
Shi Yan-Qing,Wang Jian,Zhang Guo-Yi et al. Tectono-climatic-sedimentary evolution and coupling mechanism during the middle Permian-early Triassic in Bogda area,Xinjiang[J]. JOPC, 2021, 23(2): 389-404.
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