Sedimentary characteristics of the middle Permian in Ordos Basin and its adjacent areas
Ma Yao1, Li Wen-Hou2, Zhang Qian2, Guo Yan-Qin1, Yuan Zhen1, Liao Yun1
1 School of Earth Sciences and Engineering,Xi'an Shiyou University,Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an 710065,China; 2 Department of Geology/State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China;
Abstract：The Ordos Basin and its adjacent areas are rich in natural gas resources in the upper Paleozoic. The middle Permian Shihezi Formation is the main exploration interval,and its sedimentary characteristics are of great significance for oil and gas exploration. Based on the outcrop investigation and drilling core observation,this paper makes a comprehensive analysis of the stratigraphic and lithologic characteristics,sedimentary facies types and depositional patterns of the Shihezi Formation. The results show that the middle Permian Shihezi Formation mainly developed coarse-grained terrestrial clastic rock series. Intermittent local marine transgression still exists in the study area in the middle and late Permian. The Shihezi Formation is mainly dominated by continental sedimentary systems,including alluvial fan facies,river facies,lake facies,and delta deposits,and barrier island-coastal systems. From the north to the south,the Shihezi Formation successively developed alluvial fans,rivers-deltas,shallow lakes and other deposits. The southern and southwestern margins developed shallow water delta deposits,whereas the southern and southeastern margins developed lagoons and barrier bar sands in restricted barrier bays.
Ma Yao,Li Wen-Hou,Zhang Qian et al. Sedimentary characteristics of the middle Permian in Ordos Basin and its adjacent areas[J]. JOPC, 2021, 23(1): 81-92.
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