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Features and dynamic mechanisms of Cenozoic tectonic migration and its impact on the hydrocarbon accumulation in the northern South China Sea

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Acta Oceanologica Sinica 2015年第1期34卷 100-109页

作者： YIN Zhengxin CAI Zhourong WAN Zhifeng LYU Baofeng School of Marine Sciences Sun Yat-sen University Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes

The northern continental margin of the South China Sea （SCS） is located within the tectonic system of Southeast Asia, an area with a great deal of tectonic migration due to the regional tectonic movements. The available geological and geophysical data of the area are comprehensively analyzed in order to demonstrate the typical migration patterns of the Cenozoic tectonics in the northern SCS caused by the episodes of the Cenozoic tectonic movement. Furthermore, the lateral variation characteristics of the strata and the differ- ent evolution patterns of the main basins＇ features are assessed. It primarily focus on：（1） the Cenozoic epi- sodic rifting from north to south in the continental margin of the northern SCS; （2） the rifting and depression time of the main basins progressively become younger as one goes from north to south, signifying that the migration of both the tectonics and the sediments within the northern SCS travelled from north to south during the Cenozoic; and （3） the lateral tectonic migration on the direction of EW is not regular in total, but in some local areas the trending of the tectonic migration is from west to east. The analysis of the tectonic migration features of the northern SCS, in combination with the regional tectonic evolution background, indicates that the observed remote lagging effect, resulted from the India-Eurasia plate collision, is the main dynamic mechanism involved in the tectonic migration within the northern SCS. The tectonic migration has significant influence on both the organization of petroleum deposits and on the hydrocarbon accumulation within the basins in the northern SCS; comprehensive understanding of this dynamic system is of great reference value in predicting the hydrocarbon accumulation and has the potential to have an enormous impact in discovering new deep reservoirs for the future oil-gas exploration.

关键词： tectonic migration Cenozoic hydrocarbon accumulation northern South China Sea

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Plate tectonic control on the formation and tectonic migration of Cenozoic basins in northern margin of the South China Sea

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Geoscience Frontiers 2020年第4期11卷 1231-1251页

作者： Pengcheng Wang Sanzhong Li Yanhui Suo Lingli Guo Guangzeng Wang Gege Hui M.Santosh Ian D.Somerville Xianzhi Cao Yang Li Key Lab of Submarine Geosciences and Prospecting Techniques MOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266235China School of Earth Sciences and Resources China University of Geosciences(Beijing)29 Xueyuan RoadBeijing 100083China Department of Earth Sciences University of AdelaideAdelaideSA5005Australia UCD School of Earth Sciences University College DublinBelfieldDublin 4Ireland

The tectonic evolution history of the South China Sea(SCS) is important for understanding the interaction between the Pacific tectonic Domain and the Tethyan tectonic Domain,as well as the regional tectonics and geodynamics during the multi-plate convergence in the *** Cenozoic basins formed in the northern margin of the SCS,which preserve the sedimentary tectonic records of the opening of the *** to the spatial non-uniformity among different basins,a systematic study on the various basins in the northern margin of the SCS constituting the Northern Cenozoic Basin Group(NCBG) is *** we present results from a detailed evaluation of the spatial-temporal migration of the boundary faults and primary unconformities to unravel the mechanism of formation of the *** NCBG is composed of the Beibu Gulf Basin(BBGB),Qiongdongnan Basin(QDNB),Pearl River Mouth Basin(PRMB) and Taixinan Basin(TXNB).Based on seismic profiles and gravity-magnetic anomalies,we confirm that the NE-striking onshore boundary faults propagated into the northern margin of the *** the fault slip rate,fault combination and a comparison of the unconformities in different basins,we identify NE-striking rift composed of two-stage rifting events in the NCBG:an early-stage rifting(from the Paleocene to the Early Oligocene) and a late-stage rifting(from the Late Eocene to the beginning of the Miocene).Spatially only the late-stage faults occurs in the western part of the NCBG(the BBGB,the QDNB and the western PRMB),but the early-stage rifting is distributed in the whole ***,the early-stage rifting can be subdivided into three phases which show an eastward migration,resulting in the same trend of the primary unconformities and peak faulting within the *** late-stage rifting is subdivided into two phases,which took place simultaneously in different *** first and second phase of the early-stage rifting is related to back-arc extension of the Pacific su

关键词： Northern Cenozoic basin group South China Sea NE-Striking fault tectonic migration Pacific Plate Tethyan tectonic domain

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Characteristics of crustal variation and extensional break-up in the Western Pacific back-arc region based on a wide-angle seismic profile

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Geoscience Frontiers 2021年第3期12卷 296-313页

作者： Jianghao Qi Xunhua Zhang Zhiqiang Wu XiangjunMeng Luning Shang Yang Li Xingwei Guo Fanghui Hou Enyuan He QiangWang Qingdao Institute of Marine Geology QingdaoChina Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and TechnologyQingdaoChina Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhouChina School of Resource Engineering Longyan UniversityLongyanChina

The marginal sea and back-arc basins in the Western Pacific Ocean have become the focus of tectonics due to their unique tectonic *** understand the deep crustal structure in the back-arc region,we present a 545-kmlong active-source ocean bottom seismometer(OBS)wide-angle reflection/refraction profile in the East China *** P wave velocity model shows that the Moho depth rises significantly,from approximately 30 km in the East China Sea shelf to approximately 16 km in the axis of the Okinawa *** lower crustal high-velocity zone(HVZ)in the southern Okinawa Trough,with V_(p) of 6.8-7.3 km/s,is a remarkable manifestation of the mantle material upwelling and accretion to the lower *** confirms that the lower crustal high-velocity mantle accretion is developed in the southern Okinawa *** the process of back-arc extension,the crustal structure of the southern Okinawa Trough is completely invaded and penetrated by the upper mantle material in the axis *** some areas of the southern central graben,the crust may has broken up and entered the initial stage of seafloor *** discontinuous HVZs in the lower crust in the back-arc region also indicate the migration of spreading centers in the back-arc region since the *** asthenosphere material upwelling in the continent-ocean transition zone is constantly driving the lithosphere eastward for episodic extension,and is causing evident tectonic migration in the Western Pacific back-arc region.

关键词： Western Pacific back-arc region Back-arc extension Wide-angle reflection/refraction seismic profile High-velocity zone Plate subduction retreat tectonic migration

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