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Cenozoic giant coal-bearing basin belt discovered in China's sea and its adjacent areas

Acta Oceanologica Sinica 2023年第3期42卷 101-112页

作者： Gongcheng Zhang Ying Chen Dongdong Wang Zengxue Li College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China China National Offshore Oil Corporation(CNOOC)Research Institute Co. Ltd.Beijing 100028China Department of Geology Northwest UniversityXi’an 710000China

Sea area is an important area of oil and gas exploration in *** has been found that China's sea area mainly consists of coal type oil and gas,and the exploration of coal-bearing series source rocks has become an important part of oil and gas exploration *** years of comprehensive geological research in China's sea area,it has been revealed that it has undergone multiple occurrences of tectonic opening and closing movements in varying degrees in the Paleogene,forming 26 Cenozoic sedimentary basins of various types,such as active continental margin,passive continental margin,transitional continental margin and drift rift *** the present study,it is observed for the first time that coal type source rocks are mainly developed in 14 continental margin basins in China's sea area,revealing that a very large C-shaped coal-bearing basin group developed there in the ***,based on the coupling analysis of paleoclimate,paleobotany,paleogeography and paleostructure,it is observed that there are five coal-forming periods in China's sea area,namely the Paleocene,Eocene,early Oligocene,late Oligocene and Miocene-Pliocene,and the coal-forming age is gradually new from north to *** is also found that the coal seams in the sea area are mainly developed in three coal-forming environments in Cenozoic,namely delta,fan delta and tidal *** coal seams developed in different environments are characterized by thin thickness,many layers and poor ***,the coal-bearing series source rocks in China's sea area have a wide distribution range,very high thickness and large amount,thus forming a material basis for the formation of rich coal type oil and gas.

关键词： coal-bearing basin belt coal-forming period coal-forming sedimentary environment China's sea area

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