Two-dimensional joint inversion based on the marine controlled-source electromagnetic method and seismic full-waveform
-
摘要: 为降低单一地球物理反演方法的局限性以及反演中所存在的多解性等问题, 开展了海洋可控源电磁法(MCSEM)与地震全波形的二维联合反演研究。MCSEM采用数据空间OCCAM反演算法, 地震全波形采用梯度法反演算法, 引入交叉梯度函数实现两种物性参数结果的相互耦合; 开发出一套二维联合反演算法, 并通过3组理论模型算例验证了算法的准确性。研究结果表明:MCSEM联合反演结果相对于单方法反演结果有显著改善和提升, 主要体现在异常体的形态刻画、结构构造以及物性数值的恢复, 这说明全波形的反演方法能够提高MCSEM反演结果的可靠性。Abstract: To reduce the limitations and the multiplicity of solutions of a single geophysical inversion method, this study investigated the two-dimensional joint inversion based on the marine controlled-source electromagnetic (MCSEM) method and seismic full-waveform inversion. The MCSEM method employs the data-space Occam’s algorithm, while the seismic full-waveform inversion utilizes the gradient algorithm. By incorporating a cross-gradient function for the mutual coupling of the two types of physical property parameters, this study developed a two-dimensional joint inversion method, whose accuracy was verified using three different models. As indicated by the results, compared to a single inversion method, the MCSEM-based joint inversion yielded significantly improved inversion results, predominantly in terms of the morphology characterization of anomalous bodies, as well as the reconstruction of their structure and textures and their physical property values. Therefore, the full-waveform inversion can enhance the reliability of the MCSEM inversion results.
-
-
[1] Haber E, Oldenburg D.Joint inversion:A structural approach[J].Inverse Problems, 1997, 13(1):63-77.
[2] Pak Y C, Li T L, Kim G S.2D data-space cross-gradient joint inversion of MT, gravity and magnetic data[J].Journal of Applied Geophysics, 2017, 143:212-222.
[3] Coutant O, Bernard M L, Beauducel F, et al.Joint inversion of P-wave velocity and density, application to La Soufrière of Guadeloupe hydrothermal system[J].Geophysical Journal International, 2012, 191(2):723-742.
[4] 敬荣中, 鲍光淑, 陈绍裘.地球物理联合反演研究综述[J].地球物理学进展, 2003, 18(3):535-540.
Jing R Z, Bao G S, Chen S Q.A review of the researches for geophysical combinative inversion[J].Progress in Geophysics, 2003, 18(3):535-540.
[5] Hu W Y, Abubakar A, Habashy T M.Joint electromagnetic and seismic inversion using structural constraints[J].Geophysics, 2009, 74(6):R99-R109.
[6] Brown V, Singh S C, Key K.Using seismic full waveform inversion to constrain controlled-source electromagnetic inversion[J].SEG Expanded Abstracts, 2010, 29:619-623.
[7] da Silva N V, Morgan J, Warner M, et al.3D constrained inversion of CSEM data with acoustic velocity using full waveform inversion[C]//SEG Technical Program Expanded Abstracts 2012.Society of Exploration Geophysicists, 2012.
[8] Mac-Gregor L, Bouchrara S, Tomlinson J, et al.Integrated analysis of CSEM, seismic and well log data for prospect appraisal:A case study from West Africa[J].First Break, 2012, 30(4):43-49.
[9] Saunders J H, Herwanger J V, Pain C C, et al.Constrained resistivity inversion using seismic data[J].Geophysical Journal International, 2005, 160(3):785-796.
[10] 杜润林.海洋可控源电磁场和地震波场联合反演方法研究[D].东营:中国石油大学(华东), 2015. Du R L.The research of joint inversion of marine controlled source electromagnetic and seismic[D].Dongying:China University of Petroleum (Huadong), 2015.
[11] 李刚.海洋可控源电磁与地震资料构造联合反演方法研究[D].青岛:中国海洋大学, 2015. Li G.Jont inversion of marine controlled-source electromagnetic and seismic data using the structural constraints[D].Qingdao:Ocean University of China, 2015.
[12] Hustedt B, Operto S, Virieux J.Mixed-grid and staggered-grid finite-difference methods for frequency-domain acoustic wave modelling[J].Geophysical Journal International, 2004, 157(3):1269-1296.
[13] Jo C H, Shin C, Suh J H.An optimal 9-point, finite-difference, frequency-space, 2-D scalar wave extrapolator[J].Geophysics, 1996, 61(2):529-537.
[14] Berenger J P.A perfectly matched layer for the absorption of electromagnetic waves[J].Journal of Computational Physics, 1994, 114(2):185-200.
[15] Virieux J, Operto S.An overview of full-waveform inversion in exploration geophysics[J].Geophysics, 2009, 74(6):WCC1-WCC26.
[16] 周丽芬.大地电磁与地震数据二维联合反演研究[D].北京:中国地质大学(北京), 2012. Zhou L F.Two dimensional joint inversion of MT and seismic data[D].Beijing:China University of Geosciences, 2012.
[17] Pratt R G.Seismic waveform inversion in the frequency domain, Part 1:Theory and verification in a physical scale model[J].Geophysics, 1999, 64(3):888-901.
[18] Ward S H, Hohmann G W.Electromagnetic theory for geophysical applications[M]//Electromagnetic Methods in Applied Geophysics.Society of Exploration Geophysicists, 1988:130-311.
[19] 刘颖.海洋可控源电磁法二维有限元正演及反演[D].青岛:中国海洋大学, 2014. Liu Y.2D finite element modeling and inversion for marine controlled-source electromagnetic fields[D].Qingdao:Ocean University of China, 2014.
[20] Mitsuhata Y.2-D electromagnetic modeling by finite-element method with a dipole source and topography[J].Geophysics, 2000, 65(2):465.
[21] Siropunvarapor W, Egbert G.An efficient data-subspace inversion method for 2-D magnetotelluric data[J].Geophysics, 2000, 65(3):791-803.
[22] Meju M A, Gallardo L A, Mohamed A K.Evidence for correlation of electrical resistivity and seismic velocity in heterogeneous near-surface materials[J].Geophysical Research Letters, 2003, 30(7):1373-1376.
[23] Gallardo L A, Meju M A.Joint two-dimensional DC resistivity and seismic travel time inversion with cross-gradients constraints[J].Journal of Geophysical Research:Solid Earth, 2004, 109(B3):B03311.
[24] 王涛.磁法与可控源音频大地电磁法二维联合反演研究[D].北京:中国地质大学(北京), 2016. Wang T.Two-dimensional joint inversion of magnetic and CSAMT methods[D].Beijing:China University of Geosciences(Beijing), 2016.
[25] 郭长安.电阻率法和地震全波形二维联合反演研究[D].北京:中国地质大学(北京), 2018. Guo C A.Two-dimensional joint inversion of resistivity and seismic full-waveform method[D].Beijing:China University of Geosciences(Beijing), 2018.
-
计量
- 文章访问数: 31
- PDF下载数: 6
- 施引文献: 0
下载: