东海陆架盆地重震联合解释推断研究
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摘要
目前,我国海洋区域地质调查以重磁为主,辅以二维地震,用单一的物探方法难以探测海区沉积盆地中的各个密度界面,本文充分发挥地震、重力和磁力资料的特点,进行优势互补,利用重震联合界面反演技术,对东海陆架盆地的三个密度界面,上新统底界面、中新统底界面和沉积基底进行反演,利用反演结果对研究区的构造区划进行重新认识.东海陆架盆地西部凹陷基本缺失渐新统,海礁凸起南北两块的分界处东西方向的长度较短,钱塘凹陷向东北方向延伸较长,东部西湖凹陷地层发育齐全,新生代沉积厚度大,沉降幅度大,底界面在11794米左右.说明利用重震联合密度界面反演及解释是一项可行的技术.
At present,China's ocean regional geological survey mainly depends on gravity and magnetic prospecting,and 2D seismic prospecting is an important auxiliary.It's difficult to detect every density interface in sedimentation basin in the sea area.In this paper,we give full play to the characteristics of seismic,gravity and magnetic data,complementing each other's advantages.We inverted three density interfaces of the East China Sea shelf basin by the technology of seismic-gravity joint inversion.The three interfaces include the bottom of Pliocene series,Miocene series and sedimentary base.The inversion results can draw new conclusions on tectonic division.The west of the East China Sea shelf basin almost losses Oligocene,the dividing line between north and south block of haijiao uplift should be shorter in the west and east direction.Qiantang sag extended longer in the northeast.The formations of xihu sag were completely developed,the thickness and the subsidence amplitude of Cenozoic sedimentary is big,and the basement base is about 11794 meters.It is proved that the interpretation method by jointing gravity and seismic data is an effective technique.
At present,China's ocean regional geological survey mainly depends on gravity and magnetic prospecting,and 2D seismic prospecting is an important auxiliary.It's difficult to detect every density interface in sedimentation basin in the sea area.In this paper,we give full play to the characteristics of seismic,gravity and magnetic data,complementing each other's advantages.We inverted three density interfaces of the East China Sea shelf basin by the technology of seismic-gravity joint inversion.The three interfaces include the bottom of Pliocene series,Miocene series and sedimentary base.The inversion results can draw new conclusions on tectonic division.The west of the East China Sea shelf basin almost losses Oligocene,the dividing line between north and south block of haijiao uplift should be shorter in the west and east direction.Qiantang sag extended longer in the northeast.The formations of xihu sag were completely developed,the thickness and the subsidence amplitude of Cenozoic sedimentary is big,and the basement base is about 11794 meters.It is proved that the interpretation method by jointing gravity and seismic data is an effective technique.
引文
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[8]高德章.东海陆架盆地岩石密度与磁性[J].上海地质,1995,54(2):38-45.Gao D Z.Density and magnetic of rocks in the East Sea shelfbasin[J].Shanghai Geology(in Chinese),1995,54(2):38-45.
[9]高德章,赵金海,薄玉玲,等.东海重磁地震综合探测剖面研究[J].地球物理学报,2004,47(5):853-861.Gao D Z,Zhao J H,Bo Y L,et al.A profile study ofgravitative-magnetic and seismic comprehensive survey in theEast China Sea[J].Chinese J.Geophys.(in Chinese),2004,47(5):853-861.
[10]高德章,唐建,薄玉玲.东海地球物理综合探测剖面及其解释[J].中国海上油气(地质),2003,17(1):38-43.Gao D Z,Tang J,Bo Y L.An integrated profile ofgeophysical survey and its interpretation in East China Sea[J].China Offshore Oil and Gas(Geology)(in Chinese),2003,17(1):38-43.
[11]丁海涛,陈冰,高德章,等.东海陆架盆地典型剖面的综合地球物理解释[J].勘探地球物理进展,2004,27(4):269-273.Ding H T,Chen B,Gao D Z,et al.Integrated geophysicalinterpretation of the typical profile of the East China Sea shelfbasin[J].Progress in Exploration Geophysics(in Chinese),2004,27(4):269-273.
[12]江为为,刘少华,郝天珧,等.应用重力资料估算东海冲绳海槽地壳厚度[J].地球物理学进展,2002,17(1):35-41.Jang W W,Liu S H,Hao T Y,et al.Using gravity data tocompute crustal thickness of East China Sea and okinawatrough[J].Progress in Geophys.(in Chinese),2002,17(1):35-41.
[13]戴明刚.东海及邻域的两条剖面地球物理反演与综合解释[J].地球物理学进展,2004,19(2),331-340.Dai Y G.Inversion research for gravity and syntheticalinterpretation of two profiles in the area of East China Seaand its adjacency[J].Progress in Geophys.(in Chinese),2004,(2),331-340.
[14]栾锡武,高德章,喻普之,等.中国东海及邻近海域一条剖面的地壳速度结构研究[J].地球物理学进展,2001,16(2):28-34.Luan X W,Gao D Z,Yu P Z,et al.The crust velocitystructure of a profile in the Area of East China Sea and itsvicinity[J].Progress in Geophys.(in Chinese),2001,16(2):28-34.
[15]Parker R L.The rapid calculation of potential anomalies[J].Geophys.J.Roy.Astr.Soc,1973,31(4):447-455.
[16]Oldenburg D W.The inversion and interpretation of gravityanomalies[J].Geophysics,1974,39(4):526-536.
[17]王万银,潘作枢.双界面模型重力场快速正反演问题[J].石油物探,1993,32(2):81-123.Wang W Y,Pan Z S.Fast solution of forward and inverseproblems for gravity field in a dual interface model[J].Geophysical Prospecting for Petroleum(in Chinese),1993,32(2):81-123.
[18]侯遵泽,杨文采,刘家琦.中国大陆地壳密度差异多尺度反演[J].地球物理学报,1998,41(5):642-651Hou Z Z,Yang W C,Liu J Q.Multiscale inversion of thedensity contrast within the crust of China[J].Chinese J.Geophys.(in Chinese),1998,41(5):642-651.
[19]杨金玉,徐世浙,余海龙,等.视密度反演在东海及邻区重力异常解释中的应用[J].地球物理学报,2008,51(6):1909-1916.Yang J Y,Xu S Z,Yu H L,et al.Application of apparentdensity inversion method in the East China Sea and itsadjacent area[J].Chinese J.Geophys.(in Chinese),2008,51(6):1909-1916.
[20]高德章,侯遵泽,唐建.东海及邻区重力异常多尺度分解[J].地球物理学报,2000,43(6):842-849.Gao D Z,Hou Z Z,Tang J.Multiscale analysis of gravityanomalies on East China Sea and adjacent regions[J].ChineseJ.Geophys.(in Chinese),2000,43(6):842-849.
[2]郑求根,周祖翼,蔡立国,等.东海陆架盆地中新生代构造背景及演化[J].石油与天然气地质,2005,26(2):197-201.Zhen Q G,Zhou Z Y,Cai L G,et al.Meso-cenozoic tectonicsetting and evolution of East China Sea shelf basin[J].Oil&Gas Geology(in Chinese),2005,26(2):197-201.
[3]覃建雄,田景春,杨作升.东海盆地第三系层序地层学初探[J].成都理工学院学报,1998,25(4):503-510.Qin J X,Tian J C,Yang Z S.A study on sequenceStratigraphy of tertiary in the East China Sea Basin[J].Journal of Chengdu University of Technology(in Chinese),1998,25(4):503-510.
[4]栾锡武,秦蕴珊,张训华,等.东海陆坡及相邻槽底天然气水合物的稳定域分析[J].地球物理学报,2003,46(4):467-475.Luan X W,Qin Y S,Zhang X H,et al.The stability zone ofgas hydrate in the slope of East China Sea and neighboringtrough basin area[J].Chinese J.Geophys.(in Chinese),2003,46(4):467-475.
[5]郝天珧,徐亚,胥颐,等.对黄海-东海研究区深部结构的一些新认识[J].地球物理学报,2006,49(2):458-468.Hao T Y,Xu Y,Xu Y,et al.Some new understandings ondeep structure in Yellow Sea and East China Sea[J].ChineseJ.Geophys.(in Chinese),2006,49(2):458-468.
[6]陈冰,王家林,吴健生,等.东海陆架盆地海礁凸起南块基底性质研究[J].石油实验地质,2002,24(4):302-305.Chen B,Wang J L,Wang J S,et al.Study on the basementproperties of the South Haijiao Uplift in the East China Seashelf basin[J].Petroleum Geology&Experiment(inChinese),2002,24(4):302-305.
[7]韩波,张训华,裴建新,等.东海及其邻域壳-幔结构与展布特征[J].地球物理学进展,2007,22(2):376-382.Han B,Zhang X H,Pei J X,et al.Characteristics of crust-mantle in East China sea and adjacent regions[J].Progress inGeophysics(in Chinese),2007,22(2):376-382.
[8]高德章.东海陆架盆地岩石密度与磁性[J].上海地质,1995,54(2):38-45.Gao D Z.Density and magnetic of rocks in the East Sea shelfbasin[J].Shanghai Geology(in Chinese),1995,54(2):38-45.
[9]高德章,赵金海,薄玉玲,等.东海重磁地震综合探测剖面研究[J].地球物理学报,2004,47(5):853-861.Gao D Z,Zhao J H,Bo Y L,et al.A profile study ofgravitative-magnetic and seismic comprehensive survey in theEast China Sea[J].Chinese J.Geophys.(in Chinese),2004,47(5):853-861.
[10]高德章,唐建,薄玉玲.东海地球物理综合探测剖面及其解释[J].中国海上油气(地质),2003,17(1):38-43.Gao D Z,Tang J,Bo Y L.An integrated profile ofgeophysical survey and its interpretation in East China Sea[J].China Offshore Oil and Gas(Geology)(in Chinese),2003,17(1):38-43.
[11]丁海涛,陈冰,高德章,等.东海陆架盆地典型剖面的综合地球物理解释[J].勘探地球物理进展,2004,27(4):269-273.Ding H T,Chen B,Gao D Z,et al.Integrated geophysicalinterpretation of the typical profile of the East China Sea shelfbasin[J].Progress in Exploration Geophysics(in Chinese),2004,27(4):269-273.
[12]江为为,刘少华,郝天珧,等.应用重力资料估算东海冲绳海槽地壳厚度[J].地球物理学进展,2002,17(1):35-41.Jang W W,Liu S H,Hao T Y,et al.Using gravity data tocompute crustal thickness of East China Sea and okinawatrough[J].Progress in Geophys.(in Chinese),2002,17(1):35-41.
[13]戴明刚.东海及邻域的两条剖面地球物理反演与综合解释[J].地球物理学进展,2004,19(2),331-340.Dai Y G.Inversion research for gravity and syntheticalinterpretation of two profiles in the area of East China Seaand its adjacency[J].Progress in Geophys.(in Chinese),2004,(2),331-340.
[14]栾锡武,高德章,喻普之,等.中国东海及邻近海域一条剖面的地壳速度结构研究[J].地球物理学进展,2001,16(2):28-34.Luan X W,Gao D Z,Yu P Z,et al.The crust velocitystructure of a profile in the Area of East China Sea and itsvicinity[J].Progress in Geophys.(in Chinese),2001,16(2):28-34.
[15]Parker R L.The rapid calculation of potential anomalies[J].Geophys.J.Roy.Astr.Soc,1973,31(4):447-455.
[16]Oldenburg D W.The inversion and interpretation of gravityanomalies[J].Geophysics,1974,39(4):526-536.
[17]王万银,潘作枢.双界面模型重力场快速正反演问题[J].石油物探,1993,32(2):81-123.Wang W Y,Pan Z S.Fast solution of forward and inverseproblems for gravity field in a dual interface model[J].Geophysical Prospecting for Petroleum(in Chinese),1993,32(2):81-123.
[18]侯遵泽,杨文采,刘家琦.中国大陆地壳密度差异多尺度反演[J].地球物理学报,1998,41(5):642-651Hou Z Z,Yang W C,Liu J Q.Multiscale inversion of thedensity contrast within the crust of China[J].Chinese J.Geophys.(in Chinese),1998,41(5):642-651.
[19]杨金玉,徐世浙,余海龙,等.视密度反演在东海及邻区重力异常解释中的应用[J].地球物理学报,2008,51(6):1909-1916.Yang J Y,Xu S Z,Yu H L,et al.Application of apparentdensity inversion method in the East China Sea and itsadjacent area[J].Chinese J.Geophys.(in Chinese),2008,51(6):1909-1916.
[20]高德章,侯遵泽,唐建.东海及邻区重力异常多尺度分解[J].地球物理学报,2000,43(6):842-849.Gao D Z,Hou Z Z,Tang J.Multiscale analysis of gravityanomalies on East China Sea and adjacent regions[J].ChineseJ.Geophys.(in Chinese),2000,43(6):842-849.
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