南沙群岛海区北部中生界地震特征分析
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摘要
一系列的钻探和拖网取样都表明南沙群岛海区东、南部存在中生代海相沉积。新的国家重点基础研究发展计划地震测线经过南沙群岛海区北部,调查采用了长排列、高分辩率技术。所获地震剖面显示在披覆沉积和裂谷式充填沉积之下,还存在大套具有密集反射、倾斜形变和高角度断裂的下构造层。结合南海的构造演化过程以及钻探和拖网取样结果对比,将上覆构造层划为裂谷期及裂谷后期沉积,下构造层划为中生代沉积。残留的厚层海相中生界呈北东―西南向条带状相间分布,反映新生代拉张具有明显的块断特点。根据中生界的地层和变形特点,进一步推断南沙群岛海区北部位于中生代东亚陆缘弧前盆地的近弧一侧。
It was inferred that there were Mesozoic marine deposits in the Nansha Islands waters through extensive seismic reflection profiles,drilling and dredge sample.A new high resolution 2D seismic survey with long cable was carried out along a NNW-SSE line from the southwestern sub-basins of the South China Sea into the northern part of the Nansha Islands waters area in the South China Sea in 2009.It was shown that there is a great set of infrastructure with dipping and closely spaced reflection with high angle fault below rift and drape sedimentation.Through analysis of the drilling and dredge sample of Mesozoic samples in the Nansha Islands waters area,the sedimentary strata are divided into three structure layers by an angular disconformity,which are post-rift,syn-rift and Mesozoic marine sediments,respectively.The NE to WS trending thick Mesozoic was remained in banding distribution,which indicates that the Cenozoic rift structure is primarily characterized by the occurrence of tectonic block.It is inferred that the northern margin of the Nansha Islands waters is located in the fore-arc basin of the East Asian continental margin,close to the magmatic arc,in the Mesozoic.
It was inferred that there were Mesozoic marine deposits in the Nansha Islands waters through extensive seismic reflection profiles,drilling and dredge sample.A new high resolution 2D seismic survey with long cable was carried out along a NNW-SSE line from the southwestern sub-basins of the South China Sea into the northern part of the Nansha Islands waters area in the South China Sea in 2009.It was shown that there is a great set of infrastructure with dipping and closely spaced reflection with high angle fault below rift and drape sedimentation.Through analysis of the drilling and dredge sample of Mesozoic samples in the Nansha Islands waters area,the sedimentary strata are divided into three structure layers by an angular disconformity,which are post-rift,syn-rift and Mesozoic marine sediments,respectively.The NE to WS trending thick Mesozoic was remained in banding distribution,which indicates that the Cenozoic rift structure is primarily characterized by the occurrence of tectonic block.It is inferred that the northern margin of the Nansha Islands waters is located in the fore-arc basin of the East Asian continental margin,close to the magmatic arc,in the Mesozoic.
引文
[1]阎贫,刘海龄,邓辉.南沙地区下第三系沉积特征及其与含油气性的关系[J].大地构造与成矿学,2005,29(3):391-402.
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[13]孙龙涛,孙珍,周蒂,等.南沙海区礼乐盆地沉积地层与构造特征分析[J].大地构造与成矿学,2008,32(2):151-158.
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[15]郝沪军,施和生,张向涛,等.潮汕坳陷中生界及其石油地质条件—基于LF35-1-1探索井钻探结果的讨论[J].中国海上油气,2009,21(3):151-155.
[16]钟广见,吴世敏,冯常茂.南海北部中生代沉积模式[J].热带海洋学报,2011,30(1):43-48.
[17]刘洋波,于宏.国家海洋局第二海洋研究所南海二维测线地震资料处理报告[R].湛江:中海油能源发展股份有限公司特普地球物理分公司,2009:1-56.
[18]吕修亚,阎贫,陈洁,等.折射方法在南海北部潮汕坳陷中生界地层研究中的应用[J].热带海洋学报,2009,28(1):43-47.
[19]SCHLüTER H U,HINZ K,BLOCK M.Tectono-stratigraphic terranes and detachment faulting of the SouthChina Sea and Sulu Sea[J].Marine Geology,1996,130:39-78.
[20]YAN PIN,WANG YANLIN,LIU HAILING.Post-spreadingtranspressive faults in the South China Sea Basin[J].Tectonophysics,2008,450:70-78.
[21]HINZ K,SCHLüTER H U.Geology of the DangerousGrounds,South China Sea,and the continental margin offsouthwest Palawan:Results of Sonne cruises So-23 andSo-27[J].Energy,1985,10(3-4):297-315.
[22]PRELL W L,WANG P.Ocean Drilling Program Leg 184Preliminary Report South China Sea[R].College Station,USA:Ocean Drilling Program,Publications DistributionCenter,1999:84-85.
[23]MORLEY C K.Growth of folds in a deep-water setting[J].Geosphere,2009,5(2):59-89.
[2]孙龙涛,孙珍,詹文欢,等.南沙海域礼乐盆地油气资源潜力[J].地球科学:中国地质大学学报,2010,35(1):137-143.
[3]SALES A O,JACOBSEN E C,MORADO A A J,et al.Thepetroleum potential of deep-water northwest Palawan BlockGSEC-66[J].J Asian Earth Sci,1997,15(2-3):217-240.
[4]TAYLOR B,HAYES D E.The tectonic evolution of theSouth China Sea Basin[M]//HAYES D E.The tectonic andgeologic evolution of Southeast Asian seas and islands.Geophysical Monograph.Washington,D C:AGU,1980:89-104.
[5]HOLLOWAY N H.North Palawan Block,Philippines Itsrelation to Asian mainland and role in evolution of SouthChina Sea[J].AAPG Bull,1982,66(9):1355-1383.
[6]LI ZHENGXIANG,LI XIANHUA.Formation of the1300-km-wide intracontinental orogen and postorogenicmagmatic province in Mesozoic South China:A flat-slabsubduction model[J].Geology,2007,35(2):179-182.
[7]FYHN M B W,PEDERSEN S A S,BOLDREEL L O,et al.Palaeocene–early Eocene inversion of the Phuquoc–KampotSom Basin:SE Asian deformation associated with thesuturing of Luconia[J].J Geol Soc London,2010,167:281-295.
[8]YAN PIN,LIU HAILING.Tectonic-stratigraphic divisionand blind fold structures in Nansha Waters,South ChinaSea[J].J Asian Earth Sci,2004,24:337-348.
[9]KUDRASS H R,WIEDICKE M,CEPECK P,et al.Mesozoicand Cainozoic rocks dredged from the South China Sea(Reed Bank area)and Sulu Sea and their significance forplate-tectonic reconstructions[J].Marine and Petrol Geol,1986,3:19-30.
[10]鄢全树,石学法,王昆山,等.南沙微地块花岗质岩石la-Icp-Ms锆石u-Pb定年及其地质意义[J].地质学报,2008,82(8):1057-1067.
[11]邱燕,陈国能,刘方兰,等.南海西南海盆花岗岩的发现及其构造意义[J].地质通报,2008,27(12):2104-2107.
[12]邵磊,尤洪庆,郝沪军,等.南海东北部中生界岩石学特征及沉积环境[J].地质评论,2007,53(2):164-169.
[13]孙龙涛,孙珍,周蒂,等.南沙海区礼乐盆地沉积地层与构造特征分析[J].大地构造与成矿学,2008,32(2):151-158.
[14]MüLLER C.Biostratigraphy and geological evolution of theSulu Sea and surrounding area[C]//SILVER E A,RANGINC,VON BREYMANN M T.Proceedings of the OceanDrilling Program,scientific results.College Station,USA:Ocean Drilling Program,Publications Distribution Center,1991,124:121-131.
[15]郝沪军,施和生,张向涛,等.潮汕坳陷中生界及其石油地质条件—基于LF35-1-1探索井钻探结果的讨论[J].中国海上油气,2009,21(3):151-155.
[16]钟广见,吴世敏,冯常茂.南海北部中生代沉积模式[J].热带海洋学报,2011,30(1):43-48.
[17]刘洋波,于宏.国家海洋局第二海洋研究所南海二维测线地震资料处理报告[R].湛江:中海油能源发展股份有限公司特普地球物理分公司,2009:1-56.
[18]吕修亚,阎贫,陈洁,等.折射方法在南海北部潮汕坳陷中生界地层研究中的应用[J].热带海洋学报,2009,28(1):43-47.
[19]SCHLüTER H U,HINZ K,BLOCK M.Tectono-stratigraphic terranes and detachment faulting of the SouthChina Sea and Sulu Sea[J].Marine Geology,1996,130:39-78.
[20]YAN PIN,WANG YANLIN,LIU HAILING.Post-spreadingtranspressive faults in the South China Sea Basin[J].Tectonophysics,2008,450:70-78.
[21]HINZ K,SCHLüTER H U.Geology of the DangerousGrounds,South China Sea,and the continental margin offsouthwest Palawan:Results of Sonne cruises So-23 andSo-27[J].Energy,1985,10(3-4):297-315.
[22]PRELL W L,WANG P.Ocean Drilling Program Leg 184Preliminary Report South China Sea[R].College Station,USA:Ocean Drilling Program,Publications DistributionCenter,1999:84-85.
[23]MORLEY C K.Growth of folds in a deep-water setting[J].Geosphere,2009,5(2):59-89.
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