南海北部盆地基底岩性地震-重磁响应特征与识别
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摘要
针对性选取东南沿海露头剖面18条,采集245件南海盆地基底可能出现的岩性样品,测定其密度和磁化率,建立各种岩性的密度-磁化率交会图版,以此约束过井地震剖面和重磁异常的地质解释,总结出南海北部盆地基底火山岩、侵入岩、变质岩和沉积岩4大类11亚类岩性的地震-重磁响应特征.应用重磁震岩性解释模型逐一对南海盆地北部主干剖面进行地质-地球物理综合解释,从而实现了盆地基底岩性的平面填图.这种从盆缘剖面到盆地内部、从岩石物性测量到地质-地球物理综合解释的方法,在资料获取难度大、地质条件复杂的南海盆地基底地质研究中,业已证明是行之有效的,相信在其他盆地研究中也会有借鉴意义.
We selected 18 outcrop sections along the southeastern coast and acquired 245 rock samples which may occur in South China Sea Basin basement.Their density and magnetic susceptibility are measured and the density-magnetic susceptibility crossplot is established that is used to constrain the geological interpretation of seismic profiles through wells and potential anomalies.Then,we have summarized the seismic-potential field response characteristics of basement rocks,which contain volcanic rock,intrusive rock,metamorphic rock and sedimentary rock,in 4 categories and 11 sub-categories in the northern South China Sea Basin.Application of the geological-geophysical interpretation model to each main profile in South China Sea Basin,the basin basement lithology mapping is well achieved.So,this method,from the section of basin margin to the inner basin and from the measure of rock density and magnetic susceptibility to the geological-geophysical interpretation,has proven to be effective in the South China Sea Basin where the data acquisition is difficult and geological condition is complex.And this study also has a certain reference value for other basins.
We selected 18 outcrop sections along the southeastern coast and acquired 245 rock samples which may occur in South China Sea Basin basement.Their density and magnetic susceptibility are measured and the density-magnetic susceptibility crossplot is established that is used to constrain the geological interpretation of seismic profiles through wells and potential anomalies.Then,we have summarized the seismic-potential field response characteristics of basement rocks,which contain volcanic rock,intrusive rock,metamorphic rock and sedimentary rock,in 4 categories and 11 sub-categories in the northern South China Sea Basin.Application of the geological-geophysical interpretation model to each main profile in South China Sea Basin,the basin basement lithology mapping is well achieved.So,this method,from the section of basin margin to the inner basin and from the measure of rock density and magnetic susceptibility to the geological-geophysical interpretation,has proven to be effective in the South China Sea Basin where the data acquisition is difficult and geological condition is complex.And this study also has a certain reference value for other basins.
引文
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[20] 吴湘杰,周蒂,庞雄等.白云凹陷地球物理场及深部结构特征.热带海洋学报,2005,24(2) :62～69 Wu X J,Zhou D,Pang X,et al.Geophysical field and deep structures of Baiyun sag,Pearl River mouth basin.Journal of Tropical Oceanography (in Chinese),2005,24(2) :62-69
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[22] 周蒂,王万银,庞雄等.地球物理资料所揭示的南海东北部中生代俯冲增生带.中国科学D辑地球科学,2006,36(3) :209～218 Zhou D,Wang W Y,Pang X,et al.Mesozoic subductionaccretion zone revealed by geophysical data in the northeastern South China Sea.Science in China Ser.D Earth Sciences (in Chinese),2006,36(3) :209-218
[23] 周蒂,孙珍,陈汉宗等.南海及其围区中生代岩相古地理和构造演化.地学前缘,2005,12(3) :204～218． Zhou D,Sun Z,Chen H Z ,et al.Mesozoic lithofacies,paleo geography,and tectonic evolution of the South China Sea and surrounding areas.Earth Science Frontiers (in Chinese),2005,12(3) :204-218
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[25] 王平,夏戡原,张毅祥等.南海东北部深部构造与中新生代 沉积盆地.海洋地质与第四纪地质,2002,22(4) :59～65 Wang P,Xia K Y,Zhang Y X ,et al.Relationship between the deep structure and Cenozoic/Mesozoic sediment basins in the northeastern,South China Sea.Marine Geology & Quaternary Geology (in Chinese),2002,22(4) :59-65
[26] 陈洁.潮汕坳陷地球物理特征及油气勘探潜力.地球物理学进展,2007,22(1) :147～155 Chen J. Geophysical characteristics of the Chaoshan depression and its hydrocarbon exploration potential.Progress in Geophysics(in Chinese),2007,22(1) :147～155
[27] 陈洁,温宁,李学杰.南海油气资源潜力及勘探现状.地球物理学进展,2007,22(4) :1285～1294 Chen J,Wen N,Li X J.The status of the resource potential and petroleum exploration of the South China Sea.Progress in Geophysics (in Chinese),2007,22(4) :1285-1294
[28] 姚伯初,曾维军,陈艺中等.南海北部陆缘东部的地壳结构.地球物理学报,1994,37(1) :27～35 Yao B C,Zeng W J,Chen Y Z,et al.The crustal structure in the eastern part of the northern margin of the South China Sea.Chinese J.Geophys.(Acta Geophysica Sinica) (in Chinese),1994,37(1) :27-35
[29] 李色篆,蒲绍东,张益明等.岩矿石磁性研究方法及其应用.北京:冶金工业出版社,1988． 243～247 Li S Z,Pu S D,Zhang Y M,et al.Magnetic Properties of Rocks and Minerals and Its Application (in Chinese).Beijing:Metallurgy Industry Press,1988． 243-247
[30] 龚再升,李思田.南海北部大陆边缘盆地分析与油气聚集.北京:科学出版社.1997． 31～35 Gong Z S,Li S T.Continental margin basin analysis and hydrocarbon accumulation of the northern South China Sea (in Chinese).Beijing:Science Press,1997． 31-35
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[2] 刘海龄,杨恬,朱淑芬等.南海西北部新生代沉积基底构造演化.海洋学报,2004,3(26) :54～67 Liu H L,Yang T,Zhu S F,et al.Tectonic evolution of Cenozoic sedimentary basements in the northwestern South China Sea.ActaOceanologica Sinica (in Chinese),2004,3 (26) :54-67
[3] 郝天珧,徐亚,赵百民等.南海磁性基底分布特征的地球物理研究.地球物理学报,2009,52(11) :2763～2774 Hao T Y,Xu Y,Zhao B M,et al.Geophysical research on distribution features of magnetic basements in the South China Sea.Chinese J.Geophys.(in Chinese),2009,52 (11) :2763-2774
[4] 朱炳泉,王慧芳.雷琼地区MORB-OIB过渡地幔源火山作用的Nd-Sr-Pb同位素证据.地球化学,1989,20(4) :251～251 Zhu B Q,Wang H F.Nd Sr-Pb isotopic and chemical evidence for the volcanism with MORB-OIB source characteristic in the Leiqiong area,China.Geochimica (in Chinese),1989,20(4) :251-251
[5] 王贤觉,吴明清,梁德华.南海玄武岩的某些地球化学特征.地球化学,1984,4:332-340 Wang X J,Wu M Q,Liang D H.Some geochemical characteristics of basalts in the South China Sea.Geochimica (in Chinese) 1984,4:332-340
[6] Tu K,Flower F J,Carlson R W,et al.Magmatism in the South China Basin:1． Isotopic and trace element evidence for an endogenous Dupal mantle component.Chemical Geology,1992,97(1-2) :47-63
[7] 邹和平,李平鲁,饶春涛.珠江口盆地新生代火山岩地球化学特征及其地球动力学意义.地球化学,1995,24(增刊):33～45 Zou H P,Li P L,Rao C T.Geochemistry of Cenozoic volcanic rocks in Pearl River Mouth Basin and its geodynamic significance.Geochimica (in Chinese),1995,24(Suppl.):33-45
[8] Flower F J,Zhang M,Chen C Y,et al.Magmatism in the South China Basin:2． Post-spreading Quaternary basalts from Hainan Island,south China.Chemical Geology,1992,97(1-2) :65-87
[9] 阎贫,刘海龄.南海及周缘中新生代火山活动时空特征与南海的形成模式.热带海洋学报,2005,24(2) :33～41 Yan P,Liu H L.Temporal and spatial distributions of MesoCenozoic igneous rocks over South China Sea.Journal of Tropical Oceanography (in Chinese) ,2005,24(2) :34-41
[10] Yan Q S,Shi X F,Wang K S,et al.Major element,trace element,Sr-Nd-Pb isotopic studies of Cenozoic alkali basalts from the South China Sea.Science in China (Set.D:Earth Sciences).2008,51(4) :550-566
[11] 刘光鼎,陈洁.中国前新生代残留盆地油气勘探难点分析及对策.地球物理学进展,2005,20(2) :273～275 Liu G D,Chen J.Analysis of difficulties in gas petroleum prospecting in Chinese Pre-Cenozoic relic basin and the corresponding solutions.Progress in Geophysics (in Chinese),2005,20(2) :273-275
[12] 郝天珧,杨长春,王真理等.海区前新生代残留盆地油气研究的综合地球物理技术.地球物理学进展,2008,23(3) :731～742 Hao T Y,Yang C C,Wang Z L,et al.Comprehensive geophysical technology on oil & gas resources of Pre-Cenozoic residual basin in Chinese marine area.Progress in Geophysics (in Chinese),2008,23(3) :731-742
[13] 郝天珧,黄松,徐亚等.南海东北部及邻区深部结构的综合地球物理研究.地球物理学报,2008,51(6) :1785～1796 Hao T Y,Huang S,Xu Y,et al.Comprehensive geophysical research on the deep structure of Northeastern South China Sea.Chinese J.Geophys.(in Chinese).2008,51(6) :1785-1796
[14] 邱燕,温宁.南海北部边缘东部海域中生界及油气勘探意义.地质通报,2004,23(2) :142～146 Qiu Y,Wen N.Mesozoic in the eastern sea area of the northern margin of the South China Sea and its significance for oil/gas exploration.Geological Bulletin of China (in Chinese),2004,23(2) :142-146
[15] 杨少坤,林鹤鸣,郝沪军.珠江口盆地东部中生界海相油气勘探前景.石油学报,2002,23(5) :28～33 Yang S K,Lin H M,Hao L J.Oil and gas exploration prospect of Mesozoic in the eastern part of Pearl River Mouth basin.Acta Petrolei Sinica (in Chinese) ,2002,23(5) :28-33
[16] 陈洁,高德章,温宁等.南海磁场特征研究.地球物理学进展,2010,25(2) :376～388 Chen J,Gao D Z,Wen N,et al.Characteristics of the geomagnetic field in the South China Sea.Progress in Geophysics (in Chinese),2010,25(2) :376-388
[17] 陈洁,温宁.南海地球物理图集.北京:科学出版社,2010 Chen J,Wen N.Geophysical Atlas of the South China Sea (in Chinese).Beijing:Science Press,2010
[18] 胥颐,李志伟,郝天珧等.南海东北部及其邻近地区的Pn波速度结构与各向异性.地球物理学报,2007,50(5) :1473～1479 Xu Y,Li Z W,Hao T Y,et al.Pn wave velocity and anisotropy in the northeastern South China Sea and adjacent region.Chinese J.Geophys.(in Chinese),2007,50(5) :1473-1479
[19] 刘建华,胥颐,郝天珧等.中国边缘海及邻区地壳和上地幔速度结构特征.地球物理学进展,2005,20(3) :594～599 Liu J H,Xu Y,Hao T Y,et al.Three dimensional velocity structure feature in the crust and upper mantle heneath Chinese marginal seas and adjacent regions.Chinese J.Geophys.(in Chinese),2005,20(3) :594-599
[20] 吴湘杰,周蒂,庞雄等.白云凹陷地球物理场及深部结构特征.热带海洋学报,2005,24(2) :62～69 Wu X J,Zhou D,Pang X,et al.Geophysical field and deep structures of Baiyun sag,Pearl River mouth basin.Journal of Tropical Oceanography (in Chinese),2005,24(2) :62-69
[21] 王家林,张新兵,吴健生等.珠江口盆地基底结构的综合地球物理研究.热带海洋学报,2002,21(2) :13～22 Wang J L,Zhang X B,Wu J S,et al.Integrated geophysical researches on base texture of Pearl River mouth basin.Journal of Tropical Oceanography (in Chinese),2002,21(2) :13-22
[22] 周蒂,王万银,庞雄等.地球物理资料所揭示的南海东北部中生代俯冲增生带.中国科学D辑地球科学,2006,36(3) :209～218 Zhou D,Wang W Y,Pang X,et al.Mesozoic subductionaccretion zone revealed by geophysical data in the northeastern South China Sea.Science in China Ser.D Earth Sciences (in Chinese),2006,36(3) :209-218
[23] 周蒂,孙珍,陈汉宗等.南海及其围区中生代岩相古地理和构造演化.地学前缘,2005,12(3) :204～218． Zhou D,Sun Z,Chen H Z ,et al.Mesozoic lithofacies,paleo geography,and tectonic evolution of the South China Sea and surrounding areas.Earth Science Frontiers (in Chinese),2005,12(3) :204-218
[24] 倪金龙,夏斌,刘海龄.南海及邻区前中生代构造演化与东特提斯构造域.海洋地质动态,2005,21(10) :11～16 Ni J L,Xia B,Liu H L.South China Sea and adjacent areas tectonic evolution in Pre-Mesozoic and the East Tethyan tectonic domain.Marine Geology Letters (in Chinese),2004,23(2) :142-146
[25] 王平,夏戡原,张毅祥等.南海东北部深部构造与中新生代 沉积盆地.海洋地质与第四纪地质,2002,22(4) :59～65 Wang P,Xia K Y,Zhang Y X ,et al.Relationship between the deep structure and Cenozoic/Mesozoic sediment basins in the northeastern,South China Sea.Marine Geology & Quaternary Geology (in Chinese),2002,22(4) :59-65
[26] 陈洁.潮汕坳陷地球物理特征及油气勘探潜力.地球物理学进展,2007,22(1) :147～155 Chen J. Geophysical characteristics of the Chaoshan depression and its hydrocarbon exploration potential.Progress in Geophysics(in Chinese),2007,22(1) :147～155
[27] 陈洁,温宁,李学杰.南海油气资源潜力及勘探现状.地球物理学进展,2007,22(4) :1285～1294 Chen J,Wen N,Li X J.The status of the resource potential and petroleum exploration of the South China Sea.Progress in Geophysics (in Chinese),2007,22(4) :1285-1294
[28] 姚伯初,曾维军,陈艺中等.南海北部陆缘东部的地壳结构.地球物理学报,1994,37(1) :27～35 Yao B C,Zeng W J,Chen Y Z,et al.The crustal structure in the eastern part of the northern margin of the South China Sea.Chinese J.Geophys.(Acta Geophysica Sinica) (in Chinese),1994,37(1) :27-35
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