音频大地电磁法对隐伏构造的识别与应用——以河南省郑州市老鸦陈周边为例
|
摘要
为探明郑州市及其周边地区隐伏构造的分布情况,在郑州北郊老鸦陈断层东侧布设了一条EW向音频大地电磁(AMT)测线,并对野外数据进行了去噪、主轴旋转、阻抗分析、静态校正等处理。用正则化反演理论方法——非线性共轭梯度法(NLCG)进行二维反演,利用与AMT测线接近平行的地震剖面分层结果对模型进行约束反演,降低了反演的多解性以及NLCG对初始模型的依赖性,最终取得了较好的电性结果。结果表明测线下方分为3层,并有一隐伏构造。结合地质、地球物理资料推断解释,此隐伏构造有可能是一条发育在晚新近系的正断层,亦或为第四系地层与新近系地层的不整合接触面。本文的研究工作为进一步探明城市隐伏构造提供了地球物理及技术手段依据。
In order to prevent geological disasters and improve urban planning,it is of great significance to explore the distribution of hidden structures in Zhenzhou and its surrounding areas by audio magnetotellurics(AMT). In this paper,an EW-trending AMT profile was set up on the east of Laoyachen fault in the northern suburb of Zhenzhou. Noise reduction,rotation,impedance analysis and static correction of the original data were processed. The 2 D regularization inversion theory method,i.e.,nonlinear conjugate gradient method(NLCG) was used. The initial mode was constrained by seismic layering results,which was nearly in parallel with the AMT profile,which reduced the multiple solution and the NLCG's dependence on the initial mode. Good electrical results were obtained,which show that there are three layers and a hidden structure in the profile. At the same time,combined with geological and geophysical data,the authors inferred the explanation. It is inferred that the hidden structure may be a normal fault developed in Late Neogene or an unconformable contact surface between Quaternary and Neogene strata. The results obtained by the authors provide the geophysical and technical basis for further exploration of urban hidden structure.
In order to prevent geological disasters and improve urban planning,it is of great significance to explore the distribution of hidden structures in Zhenzhou and its surrounding areas by audio magnetotellurics(AMT). In this paper,an EW-trending AMT profile was set up on the east of Laoyachen fault in the northern suburb of Zhenzhou. Noise reduction,rotation,impedance analysis and static correction of the original data were processed. The 2 D regularization inversion theory method,i.e.,nonlinear conjugate gradient method(NLCG) was used. The initial mode was constrained by seismic layering results,which was nearly in parallel with the AMT profile,which reduced the multiple solution and the NLCG's dependence on the initial mode. Good electrical results were obtained,which show that there are three layers and a hidden structure in the profile. At the same time,combined with geological and geophysical data,the authors inferred the explanation. It is inferred that the hidden structure may be a normal fault developed in Late Neogene or an unconformable contact surface between Quaternary and Neogene strata. The results obtained by the authors provide the geophysical and technical basis for further exploration of urban hidden structure.
引文
[1]胡天玉,李瑞玲.郑州市区三条主要断裂的确定及其意义[J].河南地质,1988,6(3):25-29.
[2]侯清卫,吴怡.老鸦陈断层的地质特征及活动性[J].华南地震,2000,20(3):71-75.
[3]刘保金,赵成斌,田勤俭,等.地震勘探资料揭示郑州老鸦陈断裂特征[J].震灾防御技术,2007,2(3):221-229.
[4]谢山立,袁广祥.超长电磁波技术在城市地热资源勘察中的应用——以郑州市老鸦陈地热田为例[J].地质与勘探,2012,48(5):1016-1022.
[5]郝凯,田勤俭,刘保金,等.郑州老鸦陈断裂的探测与活动性调查研究[J].地震学报,2008,30(4):416-423.
[6]田占峰,毛星,罗旭,等.音频大地电磁测深法在电性结构研究中的应用——以郯庐断裂带宿迁段为例[J].物探与化探,2016,40(4):732-736.
[7]杨炳南,周琦,杜远生,等.音频大地电磁法对深部隐伏构造的识别与应用:以贵州省松桃县李家湾锰矿为例[J].地质科技情报,2015,34(6):26-32.
[8]韩凯,甘伏平,梁永平,等.音频大地电磁测深法揭示的北京西山霞云岭——长操逆冲断层地下构造特征及其意义[J].地质论评,2015,61(3):645-650.
[9]李星,王峰,罗大锋,等.综合物探方法在云南江城隐伏铅锌矿勘察中的应用[J].物探与化探,2015,39(6):1119-1123.
[10]张胜业,潘玉玲.应用地球物理学原理[M].武汉:中国地质大学出版社,2004:19-21.
[11]林玉祥,孟彩,韩继雷,等.华北地台区古近系——新近系岩相古地理特征[J].中国地质,2015,42(4):1058-1067.
[12]Sarave A K,Antaschuk K M,Nikiforov A B,et al.Audiomagnetotellurie soundings for the diamond exploration[J].Chinese J.Geophysics(in Chinese),2010,53(3):657-676.
[13]Chave A D,Thomson D J,Ander M E.On the robust estimation of power spectra,coherences and transfer functions[J].Journal of Geophysical Research,1987,92(B1):633-648,doi:10.1029/JB092i Bo1p00633.
[14]程正璞,胡祥云,李烨,等.民丰凹陷大地电磁探测研究[J].石油地球物理勘探,2016,51(2):391-403.
[15]柳建新,童孝忠,郭荣文,等.大地电磁测深法勘探[M].北京:科学出版社,2012,200-212.
[16]蔡军涛,陈小斌,赵国泽.大地电磁资料精细处理和二维反演技术研究(一)——阻抗张量分解与构造维性分析[J].地球物理学报,2010,53(10):2516-2526.
[17]刘殿秘.松辽盆地及其周围典型盆地部分地球物理特征[D].吉林:吉林大学,2008.
[18]王家映.关于大地电磁静校正问题[J].地质科学情报,1992,11(1):69-76.
[19]Constable S C,Parker R L,Constable C G.Occam's inversion:a practical algorithm for generating smooth models from electromagnetic sounding data[J].Geophysics,1987,52(3):289-300.
[20]Siripunvaraporn W,Egbert.An efficient data-subspace inversion method for 2-D magnetotelluric data[J].Geophysics,2000,65(3):791-803.
[21]Smith J T,Booker J R.Rapid inversion of two-and three-dimensional magnetotelluric data[J].Geophys.Res.,1991,96:3905-3922.
[22]戴世坤,徐世浙.MT二维和三维连续介质快速反演[J].石油地球物理勘探,1997,3(32):305-317.
[23]Smith T,Hoversten M,Gasperikova E,et al.Sharp boundary inversion of 2D magnetotelluric data[J].Geophysical Prospecting,1999,47(4):469-486.
[24]Rodi W L,Mackie R L.Nonlinear conjugate gradients algorithm for 2-D magnetotelluric inversion[J].Geophysics,2001,66(1):174-187.
[25]Yi M J,Kim J H.Enhancing the resovling power of least squares inversion with active constraint balancing[J].Geophysics,2003,68(3):931-941.
[26]刘小军,王家林,陈冰,等.二维大地电磁数据的聚焦反演算法探讨[J].石油地球物理勘探,2007,42(3):338-342.
[27]韩波,胡祥云,何展祥,等.大地电磁反演方法的数学分类[J].石油地球物理勘探,2012,47(1):177-186.
[28]康敏,胡祥云,康健,等.大地电磁二维反演方法分析对比[J].地球物理学进展,2017,32(2):476-486.
[2]侯清卫,吴怡.老鸦陈断层的地质特征及活动性[J].华南地震,2000,20(3):71-75.
[3]刘保金,赵成斌,田勤俭,等.地震勘探资料揭示郑州老鸦陈断裂特征[J].震灾防御技术,2007,2(3):221-229.
[4]谢山立,袁广祥.超长电磁波技术在城市地热资源勘察中的应用——以郑州市老鸦陈地热田为例[J].地质与勘探,2012,48(5):1016-1022.
[5]郝凯,田勤俭,刘保金,等.郑州老鸦陈断裂的探测与活动性调查研究[J].地震学报,2008,30(4):416-423.
[6]田占峰,毛星,罗旭,等.音频大地电磁测深法在电性结构研究中的应用——以郯庐断裂带宿迁段为例[J].物探与化探,2016,40(4):732-736.
[7]杨炳南,周琦,杜远生,等.音频大地电磁法对深部隐伏构造的识别与应用:以贵州省松桃县李家湾锰矿为例[J].地质科技情报,2015,34(6):26-32.
[8]韩凯,甘伏平,梁永平,等.音频大地电磁测深法揭示的北京西山霞云岭——长操逆冲断层地下构造特征及其意义[J].地质论评,2015,61(3):645-650.
[9]李星,王峰,罗大锋,等.综合物探方法在云南江城隐伏铅锌矿勘察中的应用[J].物探与化探,2015,39(6):1119-1123.
[10]张胜业,潘玉玲.应用地球物理学原理[M].武汉:中国地质大学出版社,2004:19-21.
[11]林玉祥,孟彩,韩继雷,等.华北地台区古近系——新近系岩相古地理特征[J].中国地质,2015,42(4):1058-1067.
[12]Sarave A K,Antaschuk K M,Nikiforov A B,et al.Audiomagnetotellurie soundings for the diamond exploration[J].Chinese J.Geophysics(in Chinese),2010,53(3):657-676.
[13]Chave A D,Thomson D J,Ander M E.On the robust estimation of power spectra,coherences and transfer functions[J].Journal of Geophysical Research,1987,92(B1):633-648,doi:10.1029/JB092i Bo1p00633.
[14]程正璞,胡祥云,李烨,等.民丰凹陷大地电磁探测研究[J].石油地球物理勘探,2016,51(2):391-403.
[15]柳建新,童孝忠,郭荣文,等.大地电磁测深法勘探[M].北京:科学出版社,2012,200-212.
[16]蔡军涛,陈小斌,赵国泽.大地电磁资料精细处理和二维反演技术研究(一)——阻抗张量分解与构造维性分析[J].地球物理学报,2010,53(10):2516-2526.
[17]刘殿秘.松辽盆地及其周围典型盆地部分地球物理特征[D].吉林:吉林大学,2008.
[18]王家映.关于大地电磁静校正问题[J].地质科学情报,1992,11(1):69-76.
[19]Constable S C,Parker R L,Constable C G.Occam's inversion:a practical algorithm for generating smooth models from electromagnetic sounding data[J].Geophysics,1987,52(3):289-300.
[20]Siripunvaraporn W,Egbert.An efficient data-subspace inversion method for 2-D magnetotelluric data[J].Geophysics,2000,65(3):791-803.
[21]Smith J T,Booker J R.Rapid inversion of two-and three-dimensional magnetotelluric data[J].Geophys.Res.,1991,96:3905-3922.
[22]戴世坤,徐世浙.MT二维和三维连续介质快速反演[J].石油地球物理勘探,1997,3(32):305-317.
[23]Smith T,Hoversten M,Gasperikova E,et al.Sharp boundary inversion of 2D magnetotelluric data[J].Geophysical Prospecting,1999,47(4):469-486.
[24]Rodi W L,Mackie R L.Nonlinear conjugate gradients algorithm for 2-D magnetotelluric inversion[J].Geophysics,2001,66(1):174-187.
[25]Yi M J,Kim J H.Enhancing the resovling power of least squares inversion with active constraint balancing[J].Geophysics,2003,68(3):931-941.
[26]刘小军,王家林,陈冰,等.二维大地电磁数据的聚焦反演算法探讨[J].石油地球物理勘探,2007,42(3):338-342.
[27]韩波,胡祥云,何展祥,等.大地电磁反演方法的数学分类[J].石油地球物理勘探,2012,47(1):177-186.
[28]康敏,胡祥云,康健,等.大地电磁二维反演方法分析对比[J].地球物理学进展,2017,32(2):476-486.