东海盆地丽水凹陷断裂系统划分方法研究
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摘要
重力正则化倾斜角是断裂划分的常用方法,其为一阶水平与垂直导数的比值函数,计算结果极值对应于断裂的水平位置,该方法具有均衡不同深度构造幅值的优点,提高了对较深地质构造的识别能力.数据测量误差会造成正则化倾斜角结果出现局部干扰极值,且计算结果存在一定的发散,因此直接根据极值特征来判定断裂的存在性和准确位置存在困难.为了获得准确的东海盆地丽水凹陷的断裂分布,基于欧拉方程推导出正则化倾斜角与地质体位置参数对应的线性方程,并根据正则化倾斜角的分布特征制定相应的结果筛选准则来获得准确的构造位置.通过理论模型证明该方法所反演结果能准确地标识地质体范围,将其应用于东海盆地丽水凹陷的断裂划分,相对已有结果新划分出多条近东西走滑断裂,这与凹陷表现为南北分块的特征吻合,也验证了区域太平洋俯冲作用的影响,为下一步油气勘探方案提供了详实的基础资料.
The gravity normalized angle is a common method for fracture identification, which is the ratio function of the first order and the vertical derivative, and the extreme value corresponds to the position of the structure and the boundary of the geological body. The method can have the advantages of different depth structure amplitude and improve the recognition ability of deep geological structure. Because of the data error, the result of regularized tilt Angle is local small extremum, so it is difficult to judge the existence and exact location of the fault according to the extreme feature. Regularization tilt Angle is deduced based on Euler equation and the position parameters of geological body linear equation, and according to the regularization of the Angle distribution to set up the corresponding equation calculation results screening criteria to obtain accurate structural location and boundary of the geological information. Theoretical models inversion results show that the method can accurately identify the boundary of the geological body, and we applied the method to divide the fault of Lishui sag of East China Sea basin, and we obtain several new strike-slip faults in the E-W direction relative to the existing results, which match with the characteristics of north-south component blocks of the sag, and the results also verified the influence of the Pacific subduction, and provide a reliable basis for the next oil and gas exploration plan.
The gravity normalized angle is a common method for fracture identification, which is the ratio function of the first order and the vertical derivative, and the extreme value corresponds to the position of the structure and the boundary of the geological body. The method can have the advantages of different depth structure amplitude and improve the recognition ability of deep geological structure. Because of the data error, the result of regularized tilt Angle is local small extremum, so it is difficult to judge the existence and exact location of the fault according to the extreme feature. Regularization tilt Angle is deduced based on Euler equation and the position parameters of geological body linear equation, and according to the regularization of the Angle distribution to set up the corresponding equation calculation results screening criteria to obtain accurate structural location and boundary of the geological information. Theoretical models inversion results show that the method can accurately identify the boundary of the geological body, and we applied the method to divide the fault of Lishui sag of East China Sea basin, and we obtain several new strike-slip faults in the E-W direction relative to the existing results, which match with the characteristics of north-south component blocks of the sag, and the results also verified the influence of the Pacific subduction, and provide a reliable basis for the next oil and gas exploration plan.
引文
Chen X H,Liu Z,Zhang Z X,et al. 2013. Deducing the East China Sea shelf basin by jointing gravity and seismic data [J]. Progress in Geophysics (in Chinese),28(3): 1596-1601,doi: 10.6038/pg20130357.陈晓红,刘展,张志珣,等. 2013. 东海陆架盆地重震联合解释推断研究[J]. 地球物理学进展,28(3): 1596-1601,doi: 10.6038/pg20130357.
Cooper G R J. 2009. Balancing images of potential-field data [J]. Geophysics,74(3): L17-L20.
Cooper G R J,Cowan D R. 2006. Enhancing potential field data using filters based on the local phase [J]. Computers &Geosciences,32(10): 1585-1591.
Cooper G R J,Cowan D R. 2008. Edge enhancement of potential-field data using normalized statistics [J]. Geophysics,73(3): H1-H4.
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Jiang W W,Song H B,Hao T Y,et al. 2001. The characters of geology and geophysics of shell basins of east china sea and adjacent sea area [J]. Progress in Geophysics (in Chinese),16(2): 18-27,doi: 10.3969/j.issn.1004-2903.2001.02.003.江为为,宋海斌,郝天珧,等. 2001. 东海陆架盆地及其周边海域地质、地球物理场特征[J]. 地球物理学进展,16(2): 18-27,doi: 10.3969/j.issn.1004-2903.2001.02.003.
Jiang Yubo,Gong Jianming,Cao Zhimin,et al. 2013. Correlation of the Mesozoic Between Southern East China Sea Shelf Basin and Its Adjacent Areas [J]. Marine Geology Frontiers (in Chinese),29(10): 1-7.蒋玉波,龚建明,曹志敏,等. 2013. 东海陆架盆地南部及邻区陆域中生界对比[J]. 海洋地质前沿,29(10): 1-7.
Liu ze,Dai Liming,Li Sanzhong,et al. 2017. Numerical simulation of mesozoic tectonic processes in the southern part of East China Sea continental shelf basin [J]. Marine geology and quaternary geology (in Chinese),37(4): 167-180.刘泽,戴黎明,李三忠,等. 2017. 东海陆架盆地南部中生代成盆过程的数值模拟[J]. 海洋地质与第四纪地质,37(4): 167-180.
Ma G Q. 2013. Edge detection of potential field data using improved local phase filter [J]. Exploration geophysics,44(1): 36- 41.
Ma Guoqing,Huang Danian,Liu Cai. 2016. Step-Edge Detection Filters for the Interpretation of Potential Field Data [J]. Pure and Applied Geophysics,173(3): 795-803.马国庆,黄大年,于平,等. 2012. 改进的均衡滤波器在位场数据边界识别中的应用[J]. 地球物理学报,55(12): 4288- 4295,doi: 10.6038/j.issn.0001-5733.2012.12.040.
Ma G Q,Huang D N,Yu P,et al. 2012. Aplication of improved balancing filters to edge identification of potential field data [J]. Chinese J. Geophys. (in Chinese),55(12): 4288- 4295,doi: 10.6038/j.issn.0001-5733.2012.12.040.
Miller H G,Singh V. 1994. Potential field tilt—A new concept for location of potential field sources [J]. Journal of Applied Geophysics,32(2-3): 213-217.
Reid A B,Allsop J M,Granser H. et al. 1990. Magnetic interpretation in three dimensions using Euler deconvolution [J] Geophysics,55(1): 80-91.
Roest W R,Verhoef J,Pilkington M. 1992. Magnetic interpretation using the 3-D analytic signal [J]. Geophysics,57(1): 116-125.
Thompson D T. 1982. “EULDPH”—A new technique for making computer-assisted depth estimates from magnetic data[J] Geophysics,47(1): 31-37.
Verduzco B,Fairhead J D,Green C M,et al. 2004. New insights into magnetic derivatives for structural mapping [J]. The Leading Edge,23(2): 116-119.
Wang W Y. 2010. Spatial variation law of the extreme value positions of total horizontal derivative for potential field data [J]. Chinese J. Geophys. (in Chinese),53(9): 2257-2270,doi: 10.3969/j.issn.0001-5733.2010.09.027.王万银. 2010. 位场总水平导数极值位置空间变化规律研究[J]. 地球物理学报,53(9): 2257-2270,doi: 10.3969/j.issn.0001-5733.2010.09.027.
Wijns C,Perez C,Kowalczyk P. 2005. Theta map: Edge detection in magnetic data [J]. Geophysics,70(4): L39-L43.
Yang Y Q,Li G,Dai C S. 2011. Characteristics of Mesozoic distribution and discussion on its favourable area in western depression zone of East China Sea shelf basin [J]. Global Geology (in Chinese),30(3): 396- 403.杨艳秋,李刚,戴春山. 2011. 东海陆架盆地西部坳陷带中生界分布特征及其有利区探讨[J]. 世界地质,30(3): 396- 403.
Zhu Jianjun,Wang Qi,Liang Jianshe,et al. 2012. Cenozoic Geological Structure and Tectonic Evolution of Southern East China Sea Shelf Basin [J]. Natural Gas Geoscience (in Chinese),23(2): 222-229.祝建军,王琪,梁建设,等. 2012. 东海陆架盆地南部新生代地质结构与构造演化特征研究[J]. 天然气地球科学,23(2): 222-229.
Cooper G R J. 2009. Balancing images of potential-field data [J]. Geophysics,74(3): L17-L20.
Cooper G R J,Cowan D R. 2006. Enhancing potential field data using filters based on the local phase [J]. Computers &Geosciences,32(10): 1585-1591.
Cooper G R J,Cowan D R. 2008. Edge enhancement of potential-field data using normalized statistics [J]. Geophysics,73(3): H1-H4.
Gong J M,Li G,Yang C S,et al. 2013. Hydrocarbon prospecting of Mesozoic Strata in Southern East China Sea shelf basin [J]. Journal of Jilin University (Earth Science Edition) (in Chinese),43(1): 20-27.龚建明,李刚,杨传胜,等. 2013,东海陆架盆地南部中生界分布特征与油气勘探前景[J]. 吉林大学学报(地球科学版),43(1): 20-27.
Jia J T,Zheng H B. 2010. Formation and tectonic evolution of the East China Sea [J]. Marine Geology Letters (in Chinese),26(1): 1-5.贾军涛,郑洪波. 2010. 东海的形成与构造演化[J]. 海洋地质动态,26(1): 1-5.
Jiang W W,Song H B,Hao T Y,et al. 2001. The characters of geology and geophysics of shell basins of east china sea and adjacent sea area [J]. Progress in Geophysics (in Chinese),16(2): 18-27,doi: 10.3969/j.issn.1004-2903.2001.02.003.江为为,宋海斌,郝天珧,等. 2001. 东海陆架盆地及其周边海域地质、地球物理场特征[J]. 地球物理学进展,16(2): 18-27,doi: 10.3969/j.issn.1004-2903.2001.02.003.
Jiang Yubo,Gong Jianming,Cao Zhimin,et al. 2013. Correlation of the Mesozoic Between Southern East China Sea Shelf Basin and Its Adjacent Areas [J]. Marine Geology Frontiers (in Chinese),29(10): 1-7.蒋玉波,龚建明,曹志敏,等. 2013. 东海陆架盆地南部及邻区陆域中生界对比[J]. 海洋地质前沿,29(10): 1-7.
Liu ze,Dai Liming,Li Sanzhong,et al. 2017. Numerical simulation of mesozoic tectonic processes in the southern part of East China Sea continental shelf basin [J]. Marine geology and quaternary geology (in Chinese),37(4): 167-180.刘泽,戴黎明,李三忠,等. 2017. 东海陆架盆地南部中生代成盆过程的数值模拟[J]. 海洋地质与第四纪地质,37(4): 167-180.
Ma G Q. 2013. Edge detection of potential field data using improved local phase filter [J]. Exploration geophysics,44(1): 36- 41.
Ma Guoqing,Huang Danian,Liu Cai. 2016. Step-Edge Detection Filters for the Interpretation of Potential Field Data [J]. Pure and Applied Geophysics,173(3): 795-803.马国庆,黄大年,于平,等. 2012. 改进的均衡滤波器在位场数据边界识别中的应用[J]. 地球物理学报,55(12): 4288- 4295,doi: 10.6038/j.issn.0001-5733.2012.12.040.
Ma G Q,Huang D N,Yu P,et al. 2012. Aplication of improved balancing filters to edge identification of potential field data [J]. Chinese J. Geophys. (in Chinese),55(12): 4288- 4295,doi: 10.6038/j.issn.0001-5733.2012.12.040.
Miller H G,Singh V. 1994. Potential field tilt—A new concept for location of potential field sources [J]. Journal of Applied Geophysics,32(2-3): 213-217.
Reid A B,Allsop J M,Granser H. et al. 1990. Magnetic interpretation in three dimensions using Euler deconvolution [J] Geophysics,55(1): 80-91.
Roest W R,Verhoef J,Pilkington M. 1992. Magnetic interpretation using the 3-D analytic signal [J]. Geophysics,57(1): 116-125.
Thompson D T. 1982. “EULDPH”—A new technique for making computer-assisted depth estimates from magnetic data[J] Geophysics,47(1): 31-37.
Verduzco B,Fairhead J D,Green C M,et al. 2004. New insights into magnetic derivatives for structural mapping [J]. The Leading Edge,23(2): 116-119.
Wang W Y. 2010. Spatial variation law of the extreme value positions of total horizontal derivative for potential field data [J]. Chinese J. Geophys. (in Chinese),53(9): 2257-2270,doi: 10.3969/j.issn.0001-5733.2010.09.027.王万银. 2010. 位场总水平导数极值位置空间变化规律研究[J]. 地球物理学报,53(9): 2257-2270,doi: 10.3969/j.issn.0001-5733.2010.09.027.
Wijns C,Perez C,Kowalczyk P. 2005. Theta map: Edge detection in magnetic data [J]. Geophysics,70(4): L39-L43.
Yang Y Q,Li G,Dai C S. 2011. Characteristics of Mesozoic distribution and discussion on its favourable area in western depression zone of East China Sea shelf basin [J]. Global Geology (in Chinese),30(3): 396- 403.杨艳秋,李刚,戴春山. 2011. 东海陆架盆地西部坳陷带中生界分布特征及其有利区探讨[J]. 世界地质,30(3): 396- 403.
Zhu Jianjun,Wang Qi,Liang Jianshe,et al. 2012. Cenozoic Geological Structure and Tectonic Evolution of Southern East China Sea Shelf Basin [J]. Natural Gas Geoscience (in Chinese),23(2): 222-229.祝建军,王琪,梁建设,等. 2012. 东海陆架盆地南部新生代地质结构与构造演化特征研究[J]. 天然气地球科学,23(2): 222-229.