Abstract：Deep-water deposits are well developed in the Early Paleozoic Pingliang Formation of the Ordos Basin. The investigation on the sedimentary system types and characteristics of the Pingliang Formation is not only helpful to understand the paleogeographic pattern and tectonic characteristics,but also has an important implication for oil and gas exploration. Based on the field survey and indoor comprehensive study of the Pingliang Formation and its contemporaneous strata in the southwest margin of the basin,we have systematically studied the Pingliang Formation in the Ordos Basin from the perspectives of stratigraphic spatial distribution,rock types,structure and texture,sedimentary facies,organic geochemical characteristics,etc. Our work indicated that there are deep-water autochthonous deposits,traction current deposits,gravity current deposits,pyroclastic rocks and seismites deposits in the Pingliang Formation,forming a sedimentary assemblage of front platform slope and deep-water basin facies. Combined the tectonic setting with sedimentary facies assemblage,the deep-water sedimentary model of the Pingliang Formation was established. The water depth of the Pingliang Formation was shallow at the initial stage of sedimentation with undeveloped contour current deposits,while the gravity flow deposits were dominant. Towards to the middle and late developed period,the gravity flow weakened with the deepening of water level,which leaded to rework of the preexisting deposits by contour currents. In addition,the deep-water deposits of the Pingliang Formation are conducive to oil and gas accumulation. Based on stratum thickness,rock type,sedimentary facies,organic matter type and content,as well as thermal evolution degree,favorable oil and gas exploration areas in the Pingliang Formation are selected in this research,which are mainly distributed in south of Wuhai,the east of Shizuishan-Helan and the west of Otog Qianqi. The area is about ten thousand square kilometers and is banded distributed in north-south direction. Finally,it is found that the key area of exploration is mainly distributed in part of the Tianhuan depression,east of Helan.
LIANG Jiwei,ZONG Hao,FENG Kunming et al. Characteristics of deep water deposits of the Ordovician Pingliang Formation in Ordos Basin[J]. JOPC, 2023, 25(3): 554-572.
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