Joint inversion of time-frequency electromagnetic and magnetotelluric data
HU Zuzhi1, LIU Xuejun1, WANG Zhigang1, HE Zhanxiang2,3, YANG Jun1
1. GME & Geochemical Surveys, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China; 2. Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China; 3. Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
Abstract：The time-frequency electromagnetic method is a controlled-source electromagnetic method, which has a strong anti-interference ability and a high resolution for the electrical layer in the middle and shallow layers. However, it is limited by the lowest excitation frequency and has a limited reflection of the deep layer. The magnetotelluric method is a natural source electromagnetic method, which features low measurement frequency and large detection depth. Hence, the two methods are complementary. In this paper, on the basis of Occam's inversion algorithm, a new joint weighting method is proposed for the joint inversion between time-frequency electromagnetic and magnetotelluric data. The data of model and field tests show that the joint inversion of time-frequency electromagnetic and magnetotelluric data can improve the resolution of shallow electrical anomalies, optimize the detection accuracy of deep electrical layers, and improve the ability of electromagnetic exploration to solve geological problems.
胡祖志, 刘雪军, 王志刚, 何展翔, 杨俊. 时频电磁与大地电磁数据联合反演[J]. 石油地球物理勘探, 2023, 58(3): 720-727.
HU Zuzhi, LIU Xuejun, WANG Zhigang, HE Zhanxiang, YANG Jun. Joint inversion of time-frequency electromagnetic and magnetotelluric data. Oil Geophysical Prospecting, 2023, 58(3): 720-727.
何展翔.人工源时间频率电磁测深方法[P].CN200310050098.3,2005-02-16.HE Zhanxiang.Artificial Source Time Frequency Electromagnetic Sounding Method[P].CN200310050098.3.,2005-02-16.
[2]
王志刚,何展翔,覃荆城,等.时频电磁技术的新进展及应用效果[J].石油地球物理勘探,2016,51(增刊1):144-151.WANG Zhigang,HE Zhanxiang,QIN Jingcheng,et al.Advances of TFEM technique and its application [J].Oil Geophysical Prospecting,2016,51(S1):144-151.
何展翔,胡祖志,王志刚,等.时频电磁(TFEM)技术:数据联合约束反演[J].石油地球物理勘探,2020,55(4):898-905.HE Zhanxiang,HU Zuzhi,WANG Zhigang,et al.Time-frequency electromagnetic (TFEM) technique:step-by-step constraint inversion based on artificial fish swarm algorithm [J].Oil Geophysical Prospecting,2020,55(4):898-905.
[5]
何展翔,陈忠昌,任文静,等.时频电磁(TFEM)勘探技术:数据采集系统[J].石油地球物理勘探,2020,55(5):1131-1138.HE Zhanxiang,CHEN Zhongchang,REN Wenjing,et al.Time-frequency electromagnetic (TFEM) method:data acquisition system and its application [J].Oil Geophysical Prospecting,2020,55(5):1131-1138.
[6]
HE Z X,SUO X D,HU Z Z,et al.Time-frequency electromagnetic method for exploring favorable deep igneous rock targets:a case study from North Xinjiang [J].Journal of Environmental and Engineering Geophysics,2019,24(2):215-224.
[7]
李德春,杨书江,胡祖志,等.三维重磁电震资料的联合解释——以库车大北地区山前砾石层为例[J].石油地球物理勘探,2012,47(2):353-359.LI Dechun,YANG Shujiang,HU Zuzhi,et al.Integrated interpretation of 3D gravity,magnetic,electromagnetic and seismic data:a case study of conglome-rate mass investigation in piedmont area of Kuche Depression [J].Oil Geophysical Prospecting,2012,47(2):353-359.
[8]
石艳玲,黄文辉,魏强,等.电磁井震约束反演识别川中深层裂谷[J].石油地球物理勘探,2016,51(6):1233-1240.SHI Yanling,HUANG Wenhui,WEI Qiang,et al.Deep rift identification with MT inversion constrained by shallow logging and seismic data [J].Oil Geophy-sical Prospecting,2016,51(6):1233-1240.
[9]
FARQUHARSON C G,CRAVEN J A.Three-dimensional inversion of magnetotelluric data for mineral exploration:an example from the McArthur River Uranium deposit,Saskatchewan,Canada[J].Journal of Applied Geophysics,2009,68(4):450-458.
[10]
NEWMAN G A,GASPERIKOVA E,HOVERSTEN G M,et al.Three-dimensional magnetotelluric characterization of the Coso geothermal field[J].Geothermics,2008,37(4):369-399.
[11]
BECKEN M,RITTER O,BEDROSIAN P A,et al.Correlation between deep fluids,tremor and creep along the central San Andreas fault [J].Nature,2011,480(7375):87-90.
[12]
汤吉,詹艳,赵国泽,等.青藏高原东北缘玛沁—兰州—靖边剖面地壳上地幔电性结构研究[J].地球物理学报,2005,48(5):1205-1216.TANG Ji,ZHAN Yan,ZHAO Guoze,et al.Electrical conductivity structure of the crust and upper mantle in the northeastern margin of the Qinghai-Tibet pla-teau along the profile Maqên-Lanzhou-Jingbian[J].Chinese Journal of Geophysics,2005,48(5):1205-1216.
[13]
徐义贤,郑建平,杨晓志,等.岩石圈中部不连续面的成因及其动力学意义[J].科学通报,2019,64(22):2305-2315.XU Yixian,ZHENG Jianping,YANG Xiaozhi,et al.The origins and geodynamic implications of mid-lithospheric discontinuities [J].Chinese Science Bulletin,2019,64(22):2305-2315.
[14]
杨文采,徐义贤,张罗磊,等.塔里木地体大地电磁调查和岩石圈三维结构[J].地质学报,2015,89(7):1151-1161.YANG Wencai,XU Yixian,ZHANG Luolei,et al.Magnetotellruic investigation and 3D lithospheric structures in the Tarim terrane[J].Acta Geologica Sinica,2015,89(7):1151-1161.
[15]
赵国泽,陈小斌,肖骑彬,等.汶川MS8.0级地震成因三 “层次” 分析——基于深部电性结构[J].地球物理学报,2009,52(2):553-563.ZHAO Guoze,CHEN Xiaobin,XIAO Qibin,et al.Generation mechanism of Wenchuan strong earthquake of MS8.0 inferred from EM measurements in three levers [J].Chinese Journal of Geophysics,2009,52(2):553-563.
[16]
王绪本,张刚,周军,等.龙门山构造带壳幔电性结构特征及其与汶川、芦山强震关系[J].地球物理学报,2018,61(5):1984-1995.WANG Xuben,ZHANG Gang,ZHOU Jun,et al.Crust and upper mantle electrical resistivity structure in the Longmenshan tectonic belt and its relationship with Wenchuan and Lushan earthquakes [J].Chinese Journal of Geophysics,2018,61(5):1984-1995.
[17]
何继善.广域电磁法和伪随机信号电法[M].北京:高等教育出版社,2010.HE Jishan.Wide Area Electromagnetic Method and Pseudo Random Signal Electrical Method [M].Higher Education Press,Beijing,2010.
[18]
王家映.石油电法勘探[M].北京:石油工业出版社,1992.WANG Jiaying.Petroleum Electrical Prospecting [M].Petroleum Industry Press,Beijing,1992.
汤井田,何继善.可控源音频大地电磁法及其应用[M].湖南长沙:中南大学出版社,2005.TANG Jingtian,HE Jishan.Controllable Source Audio Frequency Magnetotelluric Method and Its Application [M].Central South University Press,Changsha,Hunan,2005.
[21]
VOZOFF K,JUPP D L B.Joint inversion of geophy-sical data [J].Geophysical Journal of the Royal Astronomical Society,1975,42(3):977-991.
[22]
SASAKI Y.Two-dimensional joint inversion of magnetotelluric and dipole-dipole resistivity data[J].Geo-physics,1989,54(2):254-262.
[23]
MCMILLAN M S,OLDENBURG D W.Cooperative constrained inversion of multiple electromagnetic data sets [J].Geophysics,2014,79(4):B173-B185.
[24]
李曼,于鹏,张志勇,等.二维直流电阻率与音频大地电磁自适应渐进联合反演[J].同济大学学报(自然科学版),2020,48(1):114-122.LI Man,YU Peng,ZHANG Zhiyong,et al.Study of 2-D joint inversion of direct current resistivity and audio magnetotelluric data using adaptive progressive mesh refinement strategy [J].Journal of Tongji University (Natural Science),2020,48(1):114-122.
[25]
MEJU M A.Joint inversion of TEM and distorted MT soundings:some effective practical considerations [J].Geophysics,1996,61(1):56-65.
[26]
MACKIE R,WATTS M D,RODI W.Joint 3D inversion of marine CSEM and MT data [C].SEG Technical Program Expanded Abstracts,2017,36:574-578.
[27]
ABUBAKAR A, LI M,LIU J,et al.Simultaneous joint inversion of MT and CSEM data using a multiplicative cost function [C].SEG Technical Program Expanded Abstracts,2009,28:719-723.
[28]
GRIBENKO A V,ZHDANOV M S.Joint 3D inversion of marine CSEM and MT data [C].SEG Technical Program Expanded Abstracts,2011,30:552-556.
[29]
WIIK T,HOKSTAD K,URSIN B,et al.Joint contrast source inversion of marine magnetotelluric and controlled-source electromagnetic data [J].Geophy-sics,2013,78(6):E315-E327.
[30]
赵宁,王堃鹏,秦策.海洋CSEM和MT一维联合反演研究[J].物探化探计算技术,2014,36(2):148-151.ZHAO Ning,WANG Kunpeng,QIN Ce.Research on 1-D joint inversion of marine CSEM and MT [J].Computing Techniques for Geophysical and Geoche-mical Exploration,2014,36(2):148-151.
[31]
汪茂.MT与CSAMT的二维联合反演和并行算法研究[D].北京:中国地质大学(北京),2015.WANG Mao.A Study of MT and CSAMT 2-D Joint Inversion and Parallel Algorithm [D].China University of Geosciences (Beijing),Beijing,2015.
[32]
MILLER R V,MEJU M A,SALEH A S,et al.Structure-guided 3D joint inversion of CSEM and MT data from a fold-thrust belt [C].SEG Technical Program Expanded Abstracts,2019,38:1115-1119.
KEY K.1D inversion of multicomponent,multifrequency marine CSEM data: methodology and synthetic studies for resolving thin resistive layers [J].Geophysics,2009,74(2):F9-F20.
[35]
薛国强,闫述,周楠楠,等.人工源电磁测深方法技术研究[M].北京:地质出版社,2015.XUE Guoqiang,YAN Xu,ZHOU Nannan.Research on Electromagnetic Sounding Method and Technology of Artificial Source [M].Geological Publishing House,Beijing,2015.
[36]
ZHDANOV M S,LEE S K,YOSHIOKA K.Integral equation method for 3D modeling of electromagnetic fields in complex structures with inhomogeneous background conductivity [J].Geophysics,2006,71(1):G333-G345.
[37]
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.
[38]
FLOSADÓTTIRÁH,CONSTABLE S.Marine controlled-source electromagnetic sounding:1.Modeling and experimental design [J].Journal of Geophysical Research:Solid Earth,1996,101(B3):5507-5517.
[39]
胡祥云,霍光谱,高锐,等.大地电磁各向异性二维模拟及实例分析[J].地球物理学报,2013,56(12):4268-4277.HU Xiangyun,HUO Guangpu,GAO Rui,et al.The magnetotelluric anisotropic two-dimensional simulation and case analysis [J].Chinese Journal of Geophysics,2013,56(12):4268-4277.
[40]
彭荣华,胡祥云,李建慧,等.频率域海洋可控源电磁垂直各向异性三维反演[J].地球物理学报,2019,62(6):2165-2175.PENG Ronghua,HU Xiangyun,LI Jianhui,et al.3D inversion of frequency-domain marine CSEM data in VTI media [J].Chinese Journal of Geophysics,2019,62(6):2165-2175.
[41]
赵宁,王绪本,秦策,等.基于VTI各向异性介质的频率域海洋可控源电磁三维约束反演[J].地球物理学报,2017,60(5):1946-1954.ZHAO Ning,WANG Xuben,QIN Ce,et al.3D frequency-domain MCSEM constrained inversion in VTI media [J].Chinese Journal of Geophysics,2017,60(5):1946-1954.
