Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 578-590.doi: 10.13278/j.cnki.jjuese.20180009

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Field Continuation for MCSEM Forward Modeling and Identification of Anisotropic Media

Zhang Wenqiang, Yin Changchun, Liu Yunhe, Zhang Bo, Ren Xiuyan   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2018-01-15 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by Key Project of National Key R & D Program of China (2018YFC0603300, 2016YFC0303100, 2017YFC0601903), National Natural Science Foundation of China (41530320, 41774125), and Strategic Priority Research Program of Chinese Academy of Sciences (XDA14020102)

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Abstract: Marine controlled-source electromagnetic (MCSEM) has been widely used in offshore hydrocarbon exploration in recent years. Huge drilling cost has been saved because of its high sensitivity to resistive oil reservoirs. The ocean sedimentary environment creates strong stratification and anisotropy in submarine media. Thus, the modeling for MCSEM needs to be made for anisotropic media. In this study, we solved the problem of electromagnetic (EM) field in wavenumber domain by introducing two scalar potentials that are continued upwards and downwards based on the continuation conditions of EM field and coupled to transmitting source at the location of transmitting dipole. The EM field in the space domain was calculated by using Hankel Transform. Through the analysis of anisotropic characteristics, we found that the anisotropy has a great influence on the responses of MCSEM, and only the vertical resistivity and the thickness have an influence on the responses of MCSEM for the resistive reservoir. We set up a procedure to distinguish the earth's anisotropy from the polar plots of marine apparent resistivity. This study lays a foundation for the inversion and interpretation of marine EM data.

Key words: marine CSEM, electrical anisotropy, forward modeling, apparent resistivity, anisotropic identification

CLC Number: 

  • P631.3
[1] Cagniard L.Basic Theory of the Magnetotelluric Mehod of Geophysical Prospecting[J].Geophysics,1953,18(3):605-635.
[2] Bannister P R.Determination of the Electrical Conduc-tivity of the Sea Bed in Shallow Waters[J].Geophysics,1968,33(6):995-1003.
[3] Cox C.Electromagnetic Induction in the Oceans and Inferences on the Constitution of the Earth[J].Geophysical Surveys,1980,4:137-156.
[4] 李桐林,林君,刘福春,等.国内外海洋大地电磁测深的发展综述[J].国外地质勘探技术,1998,4:1-10. Li Tonglin,Lin Jun,Liu Fuchun,et al.Review on Marine Magnetotellric Techolonogy and Developments[J].Foreign Geoexploration Techolonogy,1998,4:1-10.
[5] Eidesmo T,Ellingsrud S,Macgregor L,et al.Sea Bed Logging (SBL),a New Method for Remote and Direct Identification of Hydrocarbon Filled Layers in Deepwater Areas[J].First Break,2002,20(3):144-152.
[6] Constable S,Weiss C J.Mapping Thin Resistors and Hydrocarbons with Marine EM Methods:Insights from 1D Modeling[J].Geophysics,2006,71(2):G73-G51.
[7] Zhao L X,Geng J H,Zhang S Y.et al.1-D Controlled Source Electromagnetic Forward Modeling for Marine Gas Hydrates Studies[J].Applied Geophysics,2008,5(2):121-126.
[8] Key K.1D Inversion of Multicomponent,Multifre-quency Marine CSEM Data:Methodology and Synthetic Studies for Resolving Thin Resistive Layers[J].Geophysics,2009,74(2):F9-F20.
[9] Silva Crepaldi J L,Pereira Buonora M P,Figueiredo I.Fast Marine CSEM Inversion in the CMP Domain Using Analytical Derivatives[J].Geophysics,2011,76(5):F303-F313.
[10] Streich R,Becken M.Electromagnetic Fields Generated by Finite-Length Wire Sources:Comparison with Point Dipole Solutions[J].Geophysical Prospecting,2011,59(2):361-374.
[11] Everett M E,Constable S.Electric Dipole Fields over an Anisotropic Seafloor:Theory and Application to the Structure of 40Ma Pacific Ocean Lithosphere[J].Geophysical Journal International,1999,136(1):41-56.
[12] Yin C.MMT Forward Modeling for a Layered Earth with Arbitrary Anisotropy[J].Geophysics,2006,71(3):G115-G128.
[13] Løseth L O,Ursin B.Electromagnetic Fields in Planarly Layered Anisotropic Media[J].Geophysical Journal International,2007,170(1):44-80.
[14] Kong F N,Johnstad S E,Rosten T,et al.A 2.5D Finite-Element-Modeling Difference Method for Marine CSEM Modeling in Stratifief Anisotropic Media[J].Geophysics,2008,73(1):F9-F19.
[15] Newman G A,CommerM,Carazzone J J.Imaging CSEM Data in the Presence of Electrical Anisotropy[J].Geophysics,2010,75(2):F51-F61.
[16] 刘云鹤,殷长春,翁爱华,等.海洋可控源电磁法发射源姿态影响研究[J].地球物理学报,2012,55(8):2757-2768. Liu Yunhe,Yin Changchun,Weng Aihua,et al.Attitude Effect for Marine CSEM System[J].Chinese Journal of Geophysics,2012,55(8),2757-2768.
[17] 殷长春,贲放,刘云鹤,等.三维任意各向异性介质中海洋可控源电磁法正演研究[J].地球物理学报,2014,57(12):4110-4122. Yin Changchun,Ben Fang,Liu Yunhe,et al.MCSEM 3D Modeling of Arbitrarily Anisotropy Media[J].Chinese Journal of Geophysics,2014,57(12):4110-4122.
[18] 贲放,刘云鹤,黄威,等.各向异性介质中的浅海海洋可控源电磁响应特征[J].吉林大学学报(地球科学版),2016,46(2):581-593. Ben Fang,Liu Yunhe,Huang Wei,et al.MCSEM Response for Anisotropic Media in Shallow Water[J].Journal of Jilin University(Earth Science Edition),2016,46(2):581-593.
[19] Yin C.Geoelectrical Inversion for a One-Dimensional Anisotropic Model and Inherent Non-Uniqueness[J].Geophysical Journal International,2000,140(1):11-23.
[20] Yin C,Maurer H M.Electromagnetic Induction in a Layered Earth with Arbitrary Anisotropy[J].Geophysics,2001,66(5):1405-1416.
[21] Bronstein I N,Semendjajew K.Taschenbuch der Mathematik[M].Leipzig:Teubner Verlagsgesellschaft and Nauka-Verlag,1979.
[22] Yin C,Zhang P,Cai J.Forward Modeling of Marine DC Resistivity Method for a Layered Anisotropic Earth[J].Applied Geophysics,2016,13(2):279-287.
[23] Li X,Pedersen L B.The Electromagnetic Response of an Azimuthally Anisotropic Half-Space[J].Geophy-sics,1991,56(9):1462-1473.
[24] Yin C,Hodges G.Identification of Electrical Anisotropy from Helicopter EM Data[C]//SAGEEP 2003:Proceedings of the Symposium on the Application of Geophysics to Engineering and Environmental Problems.San Antonio:[s.n.],2003:419-431.
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