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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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Compositional and geochronological signatures of metamafic dykes from the Sangsang peridotites, South Tibet: Evidence for magma-starved forearc rifting during Neo-Tethyan subduction re-initiation

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Geoscience Frontiers 2020年第6期11卷 2271-2286页

作者： Chi Xu Hao Zheng Argyrios Kapsiotis Yang Xiao zhifeng wan School of Marine Sciences Sun Yat-sen UniversityZhuhai 519000China Southern Laboratory of Ocean Science and Engineering(Guangdong Zhuhai)Zhuhai 519000China

In this study we present new mineral chemistry,whole-rock geochemical and zircon U-Pb geochronological data for 12 metamafic dykes in the mantle sequence of the Sangsang ophiolite in South Tibet(China).Modal analyses of these dykes gave averages of^40%-65%plagioclase and^35%-60%amphibole and small amounts of(igneous)clinopyroxene,epidote and opaque *** mineral assemblage resembles that of typical ***,due to the absence of foliation the investigated rocks are described as metamafic *** rocks have primitive mantle(PM)-normalized multi-element patterns with negative Nb and Ta anomalies as well as weak,negative Ti *** addition,they have initial 87Sr/86Sr ratios[(87Sr/86Sr)1]of0.702844-0.703581,initial 143Nd/144Nd ratios[(143Nd/144Nd)i]of 0.512891-0.512959 and high εNd(t)values(+7.9 to+9.3).Uranium-Pb ages of magmatic zircons separated from the investigated metamafic dykes indicate that the parental melts of their protoliths intruded the Sangsang mantle at^119.0-118.5 *** metamorphic mineral assemblages recognized in the investigated dykes are suggestive of a retrograde metamorphic process,from(epidote-)amphibolite facies(~470-610℃,-1.9-4.3 kbar)and to prehnitepumpellyite facies(≤280℃,<3 kbar),active within a rift-produced oceanic *** and geochemical data suggest that the protoliths of the dykes were most likely massive *** data show that the parental magmas of the gabbroic protoliths were generated by melting of a depleted mantle(DM)source that had been weakly modified by fluids emanating from a subducted oceanic lithospheric *** age of the gabbroic protoliths is slightly younger than the existing ages for ophiolites from the central Yarlung-Zangbo Suture Zone(YZSZ)in the literature(~129-123 Ma).We,therefore,suggest that the gabbroic protoliths of the Sangsang metamafic dykes were formed in an incipient forearc setting during Neo-Tethyan subduction reinitiation(Ap

关键词： Zircon Dyke Ophiolite Sangsang Tibet Neo-Tethys

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Geochemical characteristics of cold-seep carbonates in Shenhu area,South China Sea

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Journal of Oceanology and Limnology 2022年第3期40卷 969-985页

作者： Chongmin CHEN Lifeng ZHONG zhifeng wan Chiyu CHENG Wei ZHOU Xing XU School of Marine Sciences Guangdong Provincial Key Laboratory of Marine Resources and Coastal EngineeringSun Yat-sen UniversityZhuhai 519000China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China MLR Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China

Cold seeps spread worldwide along the continental margins,which are closely related to the exploration of gas ***-seep carbonates have been reported to record the nature of seepage,including fluid source,sedimentary environment,and variation of seepage *** investigated the morphology,mineralogy,element compositions,and carbon and oxygen isotopes of 15 cold-seep carbonates collected from the Shenhu area,and compared them with 2 carbonates from the Haima cold seep,the South China Sea(SCS),to promote our knowledge of cold-seep system in *** of the Shenhu carbonates exhibit crust morphology,and some are in the form of chimneys and *** absolute(20%–65%)and relative carbonate mineral contents(mainly aragonite and calcite,with minor samples containing dolomite)vary significantly,indicating the multi-stage methane leakage in our study *** samples show a slight negative Ce anomaly,suggesting either the mixing of seawater or variation of the redox condition during the precipitation;the cooccurrence of strongly enriched U and Mo demonstrates anoxic condition during *** mixed genetic methane source was interpreted by δ^(13)C of the Shenhu carbonates to range from-22.34‰to-59.30‰Vienna PeeDee Belemnite(VPDB),and the slight ^(18)O-enrichment imprinted on the carbonates suggests the possible influence from hydrate *** Haima carbonates,with biogenic methane as the main gas source,were presumably formed in a stronger fluid flux by compared with our Shenhu samples.

关键词： cold-seep carbonates geochemistry sedimentary environment fluid source Haima cold seep Shenhu area South China Sea

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The tectonic differences between the east and the west in the deep-water area of the northern South China Sea

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Acta Oceanologica Sinica 2016年第1期35卷 86-95页

作者： XIA Zhongyu wan zhifeng wanG Xianqing SHI Qiuhua CAI Song XIA Bin School of Marine Sciences Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering/Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes Sun Yat-sen University Guangzhou 510006 China The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) Chengdou 610500 China The Key Laboratory of Gas HydrateMinistry of Land and Resources Qingdao 266071 China Center for Assessment and Development of Real Estate Shenzhen 518034 China Shenzhen Branch of CNOOC Ltd. Guangzhou 510240 China

The deep-water area of the northern South China Sea, which has active and complicated tectonics, is rich in natural gas and gas hydrate. While the tectonic characteristics is different obviously between the east and the west because of the special tectonic position and tectonic evolution process. In terms of submarine geomorphology, the eastern shelf-slope structure in Pearl River Mouth Basin is characterized by having wide sub-basins and narrow intervening highs, whereas the western （Qiongdongnan Basin） structure is characterized by narrow sub- basins and wide uplift. As to the structural features, the deep-water sags in the east are all structurally half- grabens, controlled by a series of south-dipping normal faults. While the west sags are mainly characterised by graben structures with faulting in both the south and north. With regards to the tectonic evolution, the east began neotectonic activity when the post-rifting stage had completed at the end of the Middle Miocene. In the Baiyun Sag, tectonic activity became strong and was characterised by rapid subsidence and obvious faulting. Whereas in the west, neotectonic activity began at the end of the Late Miocene with rapid deposition and weak fault activity.

关键词： structural feature tectonic evolution tectonic difference deep-water basins northern South China Sea

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Development features of volcanic rocks of the Yingcheng Formation and their relationship with fault structure in the Xujiaweizi Fault Depression,Songliao Basin,China

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Petroleum Science 2012年第4期9卷 436-443页

作者： Cai Zhourong Huang Qiangtai Xia Bin Lii Baofeng Liu Weiliang wan zhifeng School of Marine Sciences Sun Yat-sen UniversityGuangzhouGuangdong 510006China Guangdong University Key Laboratory of Offshore Oil Exploration and Development GuangzhouGuangdong 510006China Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering GuangzhouGuangdong 510006China Guangzhou Institute of Geochemistry CASGuangzhouGuangdong 510640China

The Xujiaweizi Fault Depression is located in the northern Songliao Basin,Northeast *** exploration results show that the most favorable natural gas reservoirs are in the volcanic rocks of the Yingcheng Formation（K 1 yc）.Based on seismic interpretation,drill cores and the results of previous research,we analyzed the distribution of faults and the thickness of volcanic rocks in different periods of K 1 yc,and studied the relationship of volcanic activities and main *** rocks were formed in the Yingcheng period when the magma erupted along pre-existing fault *** volcanic activities strongly eroded the faults during the eruption process,which resulted in the structural traces in the seismic section being diffuse and *** tectonic activities weakened in the study area in the depression *** analysis of seismic interpretation,thin section microscopy and drill cores revealed that a large number of fractures generated in the volcanic rocks were affected by later continued weak tectonic activities,which greatly improved the physical properties of volcanic reservoirs,and made the volcanic rocks of K 1 yc be favorable natural gas *** above conclusions provide the basis to better understand the relationship of the volcanic rock distribution and faults,the mechanism of volcanic eruption and the formation of natural gas reservoirs in volcanic rocks.

关键词： Volcanic rock development features Yingcheng Formation Xujiaweizi Fault Depression Songliao Basin

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Tectonic Evolution of the Meso-Tethys in the Western Segment of Bangonghu-Nujiang Suture Zone: Insights from Geochemistry and Geochronology of the Lagkor Tso Ophiolite

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Acta Geologica Sinica(English Edition) 2015年第2期89卷 369-388页

作者： YUAN Yajuan YIN Zhengxin LIU Weiliang HUANG Qiangtai LI Jianfeng LIU Hongfei wan zhifeng CAI Zhourong XIA Bin School of Marine Sciences Sun Yat-sen University Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes Guangzhou Institute of Geochemistry Chinese Academy of Sciences Xizang Geological Survey

The subduction of the Bangonghu-Nujiang Meso-Tethys and the collision between the Lhasa and Qiangtang blocks were important events in the growth of the Tibetan crust. However, the timing of collision initiation and closure timing, as well as nature and structure of the Bangonghu ocean basin, are still poorly constrained. The Lagkor Tso ophiolite, located in the south of Gerze County, Tibet, is one of the most completed ophiolites preserved in the southern side of the Bangonghu- Nujiang suture zone. This study discussed the tectonic evolution of the Bangonghu-Nujiang suture zone as revealed by the Lagkor Tso ophiolite investigated by field investigations, petrology, geochemistry, geochronology and tectonic analysis methods. We present new LA-ICP-MS zircon U-Pb and 39Ar/4~Ar ages for the Lagkor Tso ophiolite, in addition to geochemical and platinum-group element （PGE） data presented for the Lagkor Tso ophiolite in Tibet. It is suggested that the ancient Lagkor Tso oceanic basin split in Middle Jurassic （161.2 ± 2.7 Ma - 165.4 ± 3.5 Ma）, and experienced a second tectonic emplacement during the Early Cretaceous （137.90 ± 6.39 Ma）. The Lagkor Tso ophiolite likely developed in an independent suture zone. The Bangonghu-Nujiang ocean subducted southwards, and the dehydration of the subducting oceanic crust materials caused partial melting of the continental mantle wedge, which formed the second-order expanding center of the obduction dish. This led to inter-arc expansion, followed by the formation of inter-arc and back-arc basins with island arc features, which are represented by ophiolites around the Shiquanhe-Lagkor Tso -Yongzhu region. The tectonic environment presently can be considered to be similar to that of the current Western Pacific, in which a large number of island arc-ocean basin systems are developed.

关键词： ophiolite geochemistry geochronology inter-arc basin Lagkor Tso Bangonghu-Nujiangsuture zone

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Mixing of Enriched Lithospheric Mantle-Derived and Crustal Magmas： Evidence from the Habo Cenozoic Porphyry in Western Yunnan

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Acta Geologica Sinica(English Edition) 2018年第5期92卷 1753-1768页

作者： XIA Bin LU Ye YUAN Yajuan CHEN Weiyan ZHANG Xiao XU Chi YU Shengrui wan zhifeng School of Marine Sciences Sun Yat-sen University Guangzhou 510006 China Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes Guangzhou 51006 China Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering Guangzhou 510006China

New zircon U–Pb ages, whole-rock geochemistry and zircon Hf isotopes from the Habo porphyry Western Yunnan, China, were determined to provide constraints on the timing of uplift of the Eastern Tibetan Plateau. The intrusive rocks consist of shoshonitic porphyry（syenite porphyry and monzonite porphyry）. Zircon laser ablation inductively coupled plasma mass spectrometry（LA-ICPMS） U–Pb dating indicates coeval emplacement ages of ～35 Ma. The porphyries have alkaline affinities, enrichment in large ion lithophile elements（LILEs） and light rare earth elements（LREEs）（e.g., Rb, Th, U, Pb）, with depletion of high field strength elements（HFSEs）（e.g., Nb, Ti, Ta） and weak Eu anomalies. They display uniform Lu–Hf isotopic compositions with negative zircon εHf（t） values ranging from-3.9 to-0.6. The chemical characteristics of the syenite porphyries indicated that they most likely originated from the lower crust, with mantle-derived material involved in their generation. Geochemically, the monzonite porphyries are similar to the syenite porphyries; however, the lower MgO contents suggest that they were produced by different degrees of partial melting of the same lower crust source. Combined with the geochemical and isotopic data in this paper, imply that the alkali-rich porphyries of the Habo polymetallic deposit were derived from the partial melting of lower crust, enriched by mantle magma, formed in a conversion stage from stress extrusion（a strike-slip shear process） to local stress relaxation（a strike-slip pull-apart process） at the Ailaoshao tectonic zone.

关键词： geochronology geochemistry Lu–Hf isotopes Habo porphyry western Yunnan

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南海天然气水合物资源勘查战略接替区初步分析与预测

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地球科学 2022年第5期47卷 1549-1568页

作者：何家雄宁子杰赵斌万志峰孟大江中国科学院大学北京100049 南方海洋科学与工程广东省实验室(广州) 广东广州511458 中国地质调查局广州海洋地质调查局广东广州510075 中山大学海洋科学学院广东珠海519000

二十多年来,南海天然气水合物勘查评价均主要集中在南海北部大陆边缘陆坡深水区,且先后在珠江口盆地神狐、珠江口盆地东部海域调查区和琼东南盆地陵水-松南调查区取得了天然气水合物勘查试采的重大突破及进展,陆续发现了两个大规模的天... 详细信息

二十多年来,南海天然气水合物勘查评价均主要集中在南海北部大陆边缘陆坡深水区,且先后在珠江口盆地神狐、珠江口盆地东部海域调查区和琼东南盆地陵水-松南调查区取得了天然气水合物勘查试采的重大突破及进展,陆续发现了两个大规模的天然气水合物藏,初步评价预测南海天然气水合物资源规模达800亿吨油当量左右,取得了南海天然气水合物勘探的阶段性重大成果.然而,南海天然气水合物资源进一步深化和拓展勘探的有利领域在哪里?尤其是可持续滚动勘探的战略接替区及选区在何处?其与目前陆坡深水油气及水合物勘探紧密相邻的外陆坡-洋陆过渡带(OCT)乃至洋盆区是否具有天然气水合物形成的地质条件?根据海洋地质调查及初步的地质综合分析研究,认为外陆坡-洋陆过渡带乃至洋盆区具备天然气水合物成藏的基本地质条件,可作为南海未来天然气水合物勘查的战略接替区和可持续滚动勘探的战略选区及资源远景区.针对这些影响和决定将来天然气水合物勘探决策部署及走向等关键问题进行初步分析与探讨,抛砖引玉希望能够对未来南海天然气水合物资源勘查评价及战略接替区之选择有所裨益!

关键词：南海天然气水合物资源可持续滚动勘探勘查战略接替区分析勘探远景区预测油气地质

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松辽盆地北部徐家围子断陷营城组火山岩受控机制分析

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石油学报 2010年第6期31卷 941-945,951页

作者：蔡周荣夏斌郭峰万志峰刘维亮中山大学海洋学院广东广州510275 中国科学院广州地球化学研究所广东广州510640

营城组火山岩是松辽盆地北部徐家围子断陷天然气最有利的储集体,其中营一段火山岩以中酸性为主,分布于断陷的中、南部;营三段火山岩以酸性为主,分布于断陷的中、北部。最新三维地震勘探研究成果表明,两者具有不同的发育特征:营一段火山... 详细信息

营城组火山岩是松辽盆地北部徐家围子断陷天然气最有利的储集体,其中营一段火山岩以中酸性为主,分布于断陷的中、南部;营三段火山岩以酸性为主,分布于断陷的中、北部。最新三维地震勘探研究成果表明,两者具有不同的发育特征:营一段火山岩喷发和分布明显受徐中断裂控制,表现为从断陷中部向南端扩展的特征;营三段火山岩喷发和分布则受徐东断裂构造带控制,表现为从断陷中部向北端扩展的特征。对火山岩厚度与断裂的叠合关系及区域构造特征分析表明,营城组火山岩的发育特征与西太平洋板块对东亚陆缘俯冲造成松辽盆地岩石圈拉伸减薄的地质规律相吻合,火山活动从断陷中部往南北两端扩展受构造应力场特征及断陷演化规律控制。

关键词：火山岩营城组徐中断裂徐东断裂带徐家围子断陷松辽盆地

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被动大陆边缘张裂特征与南海北部陆缘构造属性

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海洋地质前沿 2011年第9期27卷 26-31页

作者：万志峰施秋华蔡嵩中国科学院广州天然气水合物研究中心广州510640 中山大学海洋学院广州510275 中国科学院广州地球化学研究所广州510640

大陆边缘研究是板块构造运动史重建、地球环境演变研究与矿产资源开发的关键。火山型(volcanic passive margins)与非火山型(magma-poor passive margins)大陆边缘作为被动大陆边缘的2种基本类型,在结构特征、演化过程、洋陆过渡带等方... 详细信息

大陆边缘研究是板块构造运动史重建、地球环境演变研究与矿产资源开发的关键。火山型(volcanic passive margins)与非火山型(magma-poor passive margins)大陆边缘作为被动大陆边缘的2种基本类型,在结构特征、演化过程、洋陆过渡带等方面存在一定的相似之处,但二者在形成机制、构造过程、沉积特征等方面显著不同。向海倾斜的基底反射层(SDRS)以及其下高速异常体是火山型被动大陆边缘的典型标志,而非火山型被动大陆边缘以低角度拆离断层(S反射面)为主要标志。我国南海地处三大板块与两大构造域的结合部,构造特征复杂,北部大陆边缘构造属性一直备受争议。以国外典型被动大陆边缘研究成果为基础,开展多尺度构造综合研究与数值模拟分析,是行之有效的研究手段。

关键词：火山型被动大陆边缘非火山型被动大陆边缘南海北部陆缘构造属性

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