Characteristics of sequence stratigraphy and sedimentary facies of the Upper Paleozoic in Baode area, eastern margin of Ordos Basin
Hou Zhong-Shuai1, Chen Shi-Yue1, Wang Yue2, 3, Li Tian-Bao1, He Qing-Qing1, Cui Qi-Meng1
1 School of Geociences in China University of Petroleum(East China),Qingdao 266580,Shandong; 2 Research Institute of Petroleum Exploration and Development,Shengli Oilfield Company,Sinopec,Dongying 257015,Shandong; 3 Working Stations for Postdoctors of Shengli Oilfield,Dongying 257015,Shandong;
Abstract：In order to reveal the characteristics of sequence stratigraphy and sedimentary facies of the east margin of Ordos Basin,based on theories of sequence stratigraphy and sedimentology,the sequence and system tract boundary types,sequence structure,sedimentary facies types and sedimentary evolution of the Upper Paleozoic in the Palougou section of Baode area and peripheral sections in eastern margin of Ordos Basin were analysed. According to the several sequence boundaries such as regional unconformity surface,incised valley erosional surface,transgressive direction conversion surface and regional regression surface,the Upper Paleozoic in study area was divided into 7 third-order sequences,corresponding to Benxi Formation,the Second Member of Taiyuan Formation,the First Member of Taiyuan Formation,Shanxi Formation,Xiashihezi Formation,Shangshihezi Formation and Shiqianfeng Formation, respectively. The Palougou and peripheral Upper Paleozoic sections developed 16 rock types and 8 rock association types。The Upper Paleozoic developed barrier coast facies,carbonate platform facies,braided river facies and meandering river facies in the Palougou and peripheral sections. In SQ1-SQ3,the lowstand systems tract developed weathering crust and tidal channel subfacies,the transgressive systems tract developed tidal flat subfacies and lagoon subfacies,the highstand systems tract developed platform facies,lagoon subfacies and flat subfacies. In SQ4-SQ7,the lowstand systems tract developed braided river bed subfacies,the transgressive systems tract developed meandering river floodplain subfacies,the highstand systems tract developed multi-period evolutionary series of meandering river,including river bed subfacies,rive bank subfacies and floodplain subfacies. The sedimentary facies of the Upper Paleozoic in study area shifted from barrier coast facies,carbonate platform facies to fluvial facies, which was mainly affected by provenance supply,sea-level change and tectonic activity.
Hou Zhong-Shuai,Chen Shi-Yue,Wang Yue et al. Characteristics of sequence stratigraphy and sedimentary facies of the Upper Paleozoic in Baode area, eastern margin of Ordos Basin[J]. JOPC, 2018, 20(2): 231-243.
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