Sedimentary characteristics of the upper Carboniferous in Ordos Basin and its adjacent areas
Feng Juan-Ping1,2, Ouyang Zheng-Jian3, Chen Quan-Hong4, Li Wen-Hou5
1 College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China; 2 Geological Research Institute for Coal Green Mining,Xi'an 710054,China; 3 Bailie School of Petroleum Engineering,Lanzhou City University,Lanzhou 730070,China; 4 CNOOC Research Center,Beijing 100027,China; 5 Department of Geology,Northwest University,Xi'an 710069,China;
Abstract：Defining the sedimentary characteristics of the Benxi(Yanghugou)Formation of the upper Carboniferous in Ordos Basin and its adjacent areas is of great significance for predicting its sand-body distribution and hydrocarbon exploration. In this paper,the petrological characteristics,sedimentary facies types and spatial distribution of the Benxi(Yanghugou)Formation are studied,based on field geological investigation,core observation and thin section identification. It shows that the Benxi(Yanghugou)Formation mainly consists of gray-white medium to coarse-grained sandstones,dark gray and gray-black mudstones,silty mudstones and argillaceous siltstones,with multiple layers of coals,limestones and marls interbedded with these above-mentioned rocks. In the study area,the shallow sea shelf,barrier island,tidal flat,lagoon and fan delta deposits were mainly developed. The fan delta,barrier island and lagoon mainly developed in the west of the central paleo-uplift,the fan delta,lagoon,barrier island and shallow sea shelf mainly developed in the east of the central paleo-uplift,and the tidal flat mainly developed in the intermediate transition zone. It also shows that fan delta plain,fan delta front,tidal flat,lagoon and shallow sea shelf developed successively from north to south. Generally,the Benxi(Yanghugou)Formation is a set of marine-terrigenous transitional facies with the sedimentary pattern divergence from east to west.
Feng Juan-Ping,Ouyang Zheng-Jian,Chen Quan-Hong et al. Sedimentary characteristics of the upper Carboniferous in Ordos Basin and its adjacent areas[J]. JOPC, 2021, 23(1): 53-64.
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