琼东南盆地地壳密度结构重震联合反演与岩性分析
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摘要
基于南海北部深水区采集的长电缆深大地震剖面和随线重磁资料,以长电缆地震速度构建的岩石圈速度结构与几何分层作为地壳密度初始模型设计的依据,采用地震约束条件下的人机交互重力反演方法,获得了研究区沿地震测线剖面的地壳密度结构和基于三维重力异常建模的岩石圈三维密度结构,揭示出了琼东南盆地各凹陷地壳密度结构特征和沉积充填结构。通过与参考岩石物性参数的对比分析,初步识别出了琼东南盆地大型构造单元上地壳层岩性,从而为加深南海北部深水区深部结构的形成与演化研究提供了新的途径和依据。
Based on the long-cable deep seismic-reflection profiles and the gravity and magnetic data on line in the deepwater area of the northern South China Sea,the lithosphere velocity structure and geometric layering made from the long-cable seismic velocity were taken as the grounds for developing the initial model of crustal density.The application of man-machine interactive gravity inversion under the seismic constraints has resulted in recognizing crustal density structure along the seismic lines and modeling 3D lithosphere density structure from 3D gravity anomalies in Qiongdongnan basin,revealing the crustal density structure and deposition filling structure for various sags in the basin.By comparing with the petrophysical parameters of reference rocks,the upper crust lithology was tentatively identified in the major tectonic units of the basin,therefore providing a new way for probing into formation and evolution of the deep lithosphere structure in the deepwater area of the northern South China Sea.
Based on the long-cable deep seismic-reflection profiles and the gravity and magnetic data on line in the deepwater area of the northern South China Sea,the lithosphere velocity structure and geometric layering made from the long-cable seismic velocity were taken as the grounds for developing the initial model of crustal density.The application of man-machine interactive gravity inversion under the seismic constraints has resulted in recognizing crustal density structure along the seismic lines and modeling 3D lithosphere density structure from 3D gravity anomalies in Qiongdongnan basin,revealing the crustal density structure and deposition filling structure for various sags in the basin.By comparing with the petrophysical parameters of reference rocks,the upper crust lithology was tentatively identified in the major tectonic units of the basin,therefore providing a new way for probing into formation and evolution of the deep lithosphere structure in the deepwater area of the northern South China Sea.
引文
[1]刘光鼎.中国海区及领域地质地球物理系列图[M].北京:地质出版社,1994.
[2]龚再升,李思田,等.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社,1997.
[3]滕吉文,王谦身,魏斯禹.中国地壳构造的基本轮廓[J].石油物探,1982,2:14-30.
[4]张功成,米立军,吴时国,等.深水区—南海北部大陆边缘盆地油气勘探新领域[J].石油学报,2007,28(2):15-21.
[5]姚伯初,刘振湖.南沙海域沉积盆地及油气资源分布[J].中国海上油气,2006,18(3):150-160.
[6]王振峰,李绪深,孙志鹏,等.琼东南盆地深水区油气成藏条件和勘探潜力[J].中国海上油气,2011,23(1):7-13.
[7]ZHANG Z J,ZHANG X,BADAL J.Composition of the crustbeneath southeastern China derived from an integrated geo-physical data set[J].Geophys,2008:113.
[8]张中杰,刘一峰,张素芳,等.南海北部珠江口—琼东南盆地地壳速度结构与几何分层[J].地球物理学报,2009,52(10):2461-2471.
[9]张中杰,刘一峰,张素芳,等.琼东南盆地地壳伸展深度依赖性及其动力学意义[J].地球物理学报,2010,53(1):57-66.
[10]CHRISTENSEN N I,MOONEY W D.Seismic velocity struc-ture and composition of the continental crust:aglobal view[J].Journal of Geophysical Research,1995,100(6):9761-9788.
[2]龚再升,李思田,等.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社,1997.
[3]滕吉文,王谦身,魏斯禹.中国地壳构造的基本轮廓[J].石油物探,1982,2:14-30.
[4]张功成,米立军,吴时国,等.深水区—南海北部大陆边缘盆地油气勘探新领域[J].石油学报,2007,28(2):15-21.
[5]姚伯初,刘振湖.南沙海域沉积盆地及油气资源分布[J].中国海上油气,2006,18(3):150-160.
[6]王振峰,李绪深,孙志鹏,等.琼东南盆地深水区油气成藏条件和勘探潜力[J].中国海上油气,2011,23(1):7-13.
[7]ZHANG Z J,ZHANG X,BADAL J.Composition of the crustbeneath southeastern China derived from an integrated geo-physical data set[J].Geophys,2008:113.
[8]张中杰,刘一峰,张素芳,等.南海北部珠江口—琼东南盆地地壳速度结构与几何分层[J].地球物理学报,2009,52(10):2461-2471.
[9]张中杰,刘一峰,张素芳,等.琼东南盆地地壳伸展深度依赖性及其动力学意义[J].地球物理学报,2010,53(1):57-66.
[10]CHRISTENSEN N I,MOONEY W D.Seismic velocity struc-ture and composition of the continental crust:aglobal view[J].Journal of Geophysical Research,1995,100(6):9761-9788.
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