Lithofacies types and sedimentary models of the Upper Carboniferous Yanghugou Formation in western margin of Ordos Basin
WANG Ji1, WANG Feng1,2, ZHAO Weibo3, HU Jianling3, WU Jingyi1, XIAO Yunxiao1, CHEN Hongde1,2, LIU Lei1,2, WANG Zhiwei1, ZHU Shuyue1
1 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059, China; 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology),Chengdu 610059, China; 3 Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi'an 710018, China
Abstract There are much unknown about the Yanghugou Formation in the Qilian sea area in the western Ordos Basin,due to greatly varied strata thickness,diverse lithofacies associations,unclear sedimentary evolution sequences,and complex sedimentary model. Based on the detailed observation of 12 field sections and 28 drilling cores in the Yanghugou Formation in the middle and eastern part of the Qilian sea area,and combined with thin section petrological characteristics,grain size analysis,fossil remains,paleo-flow analysis,geochemistry and well logging data analysis,the lithofacies,lithofacies association characteristics as well as the sedimentary facies and evolution process of the Yanghugou Formation are systematically studied. This research shows that there are 18 lithofacies types and 8 lithofacies associations developed in the Yanghugou Formation in the Qilian sea area,western Ordos Basin,which respectively reflect the delta plain distributary channel,tide dominated delta front subaqueous distributary channel,estuary-tidal flat(tidal channel,tidal sand bar),tidal flat(sand flat,mixed flat and mudflat),barrier coast(barrier island,lagoon),barrier-open shore and shelf sedimentary characteristics. During the Yanghugou Formation depositional period,the central paleo-uplift spread from south to north across the western margin of the basin,dividing the basin into Qilian Sea and the North China Sea,and the western part of the basin is generally located in the Qilian Sea. It was a transitional continental-ocean sedimentary environment,and experienced a cycle of water deepening and then shoaling. During the deposition of the 3rd member of the Yanghugou Formation,the eastern Ordos basin was still the ancient uplift exposed to denudation,only limited deposition occurred in western basin margin. In the northern part of the study area,the water depth is shallower,and there were tidal delta-tidal flat-barrier island deposits in the Wuda-AlashanZuoqi area,while there are relatively deep water bodies in the central and southern part of the study area,and barrier island-shelf deposits were mainly developed. During the sedimentary period of the 2nd Member of the Yanghe Formation,due to the barrier of the central paleo-uplift,the east and west sea areas had not communicated,but the sedimentary range and depth of water increased significantly compared with the early period,with strong tidal influences and limited fluvial influences. In the northern Wuda area and the southern Jingyuan area of the study area,estuarine and tidal flat deposits were dominant,and the central area had the deepest water and developed shelf deposits. During the sedimentary period of the 1st Member of the Yang Formation,due to the transgression of the Qilian Sea to the east and the shrunk of the central paleo-uplift,the east and west seas communicated with each other. Consequently,the depositional area expanded,and the water body became shallower in general. In the western part of the study area,the water body was slightly deep and delta-barrier island deposits were developed,while in the eastern part the water body was shallower and tidal flat deposits were developed.
Fund:Financially supported by the CNPC project “Sedimentary system and reservoir distribution of Upper Paleozoic in west of the Ordos Basin”(No. 2020-62503)
Corresponding Authors:
WANG Feng,born in 1977,associate professor,is engaged in research on sedimentology. E-mail: wangfeng07@cdut.cn.
About author: WANG Ji,born in 1997,master degree candidate,majors in geological engineering. E-mail: wangjicdut@163.com.
Cite this article:
WANG Ji,WANG Feng,ZHAO Weibo et al. Lithofacies types and sedimentary models of the Upper Carboniferous Yanghugou Formation in western margin of Ordos Basin[J]. JOPC, 2023, 25(3): 573-597.
WANG Ji,WANG Feng,ZHAO Weibo et al. Lithofacies types and sedimentary models of the Upper Carboniferous Yanghugou Formation in western margin of Ordos Basin[J]. JOPC, 2023, 25(3): 573-597.
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