三维地质体对AMT二维反演的影响研究
|
摘要
为探究三维地质体对二维反演结果地影响以及二维反演中极化模式的选择问题,设计了一系列二维、三维地电模型进行正演计算,并对正演结果进行二维反演计算。研究结果表明:相位受到三维畸变的影响较小,视电阻率较大;当三维异常体模型走向延伸较小时,TE模式的反演结果误差较大,TM模式的反演结果相对较好,但是反演得到了虚假的下覆构造,TE+TM联合反演结合了TE和TM模式反演的优点,可以较好地反映异常体的赋存位置及电阻率值;当三维异常体模型走向延伸长度增大时,三维数据的二维反演结果是可靠的,用TM和TE+TM模式反演都比较合理。
In order to explore the influence of three-dimensional geological bodies on two-dimensional inversion results and the choice of polarization modes in two-dimensional inversion,a series of two-dimensional and three-dimensional geoelectric model are designed in forward calculation in this paper. Two-dimensional inversion calculation is performed on the forward modeling results. The results show that the phase is less affected by the three dimensional distortion, and the apparent resistivity is greatly affected. When the three-dimensional abnormal body model extends small, the error of the inversion result of TE mode is large, while the inversion of TM mode is relatively good. The inversion is obtained by the false bottom covering structure, inversion of TE+TM that combines the advantages of the TM model and TE inversion can reflect the position and value of the conductor resistivity. When the three-dimensional geological body increases extend length, the inversion results of the two-dimensional inversion of three-dimensional data are reliable by using TM and TE+TM model inversion.
In order to explore the influence of three-dimensional geological bodies on two-dimensional inversion results and the choice of polarization modes in two-dimensional inversion,a series of two-dimensional and three-dimensional geoelectric model are designed in forward calculation in this paper. Two-dimensional inversion calculation is performed on the forward modeling results. The results show that the phase is less affected by the three dimensional distortion, and the apparent resistivity is greatly affected. When the three-dimensional abnormal body model extends small, the error of the inversion result of TE mode is large, while the inversion of TM mode is relatively good. The inversion is obtained by the false bottom covering structure, inversion of TE+TM that combines the advantages of the TM model and TE inversion can reflect the position and value of the conductor resistivity. When the three-dimensional geological body increases extend length, the inversion results of the two-dimensional inversion of three-dimensional data are reliable by using TM and TE+TM model inversion.
引文
[1] 陈文华. 音频大地电磁法及其今后的研究方向[J]. 石油地球物理勘探,1981(03):62-74. CHEN W H.Audio-frequency magnetotelluric method and its research direction in the future[J] .Oil Geophysical Prospecting,1981(03):62-74.(In Chinese)
[2] 刘国栋,赵国泽. 大地电磁法新进展[J]. 地球科学进展,1994(04):97-100.LIU G D,ZHAO G Z. New advance of magnetotelluric sounding[J]. Advance in Earth Sciences,1994(04):97-100. (In Chinese)
[3] 赵国泽,陈小斌,汤吉. 中国地球电磁法新进展和发展趋势[J]. 地球物理学展,2007(04):1171-1180.ZHAO G Z,CHEN X B,TANG J.Advanced geo-electromagnetic methods in China[J].Progress in Geophysics,2007(04):1171-1180. (In Chinese)
[4] 魏文博. 我国大地电磁测深新进展及瞻望[J]. 地球物理学进展,2002(02):245-254.WEI W B. New advance and prospect of magnetotelluricsounding(MT) in China[J] . Progress in Geophysics, 2002(02):245-254. (In Chinese)
[5] SMITH J T,BOOBER J R.Rapid inversion of two-and three-dimensional magnetotelluric data[J]. Chinese Journal of Geophysics,1991, 96(96):3905-3922.
[6] RODIW,MACKIE R L.Nonlinear conjugate gradients algorithm for 2-D magnetotelluricinversion[J]. Geophysics,2001,66(1):174-187.
[7] 叶涛,陈小斌,严良俊. 大地电磁资料精细处理和二维反演解释技术研究(三)——构建二维反演初始模型的印模法[J]. 地球物理报,2013(10):3596-3606.YE T,CHEN X B,YAN L J.Refinedtechnigues for data processing and two-dimensional inversion in magnetotelluric (Ⅲ):using the Impressing Method to construct starting model of 2D magnetotelluric inversion of two-and three-dimensional magneto-telluric data[J]. Chinese Journal of Geophysics,2013(10):3596-3606. (In Chinese)
[8] 余年. 大地电磁二、三维倾子正演模拟与联合反演研究[D].成都:成都理工大学,2012.YU N.2D/3D Tipper forward modeling and joint inversion of magnetotelluric[D].Chengdu:Chengdu University of Technology,2012. (In Chinese)
[9] 胡祖志,胡祥云. 大地电磁三维反演方法综述[J]. 地球物理学进展,2005(01):214-220.HU Z Z,HU X Y.Review of three dimensional magnetotelluric inversion methods[J].Progress Geophysics in,2005(01):214-220. (In Chinese)
[10] LEDO J. 2-D versus 3-D magnetotelluric data interpretation[J].Surv Geophys,2006(27):511-543.
[11] 蔡军涛,陈小斌.大地电磁资料精细处理和二维反演解释技术研究(二)—反演数据极化模式选择[J].地球物理学报,2010,53(11):2703-2714.CAI J T,CHEN X B.Refined techniques for data processing and two-dimensional inversion In magnetotelluricⅡ:Which data polarization mode should be used in 2D inversion[J]. Chinese Journal of Geophysics, 2010,53(11): 2703-2714. (In Chinese)
[12] SIRIPUNVARAPORN W, EGBERT G. An efficient data-subspace inversion method for 2-D magnetotelluric data[J]. Geophysics, 2000, 65(3):791.
[13] Siripunvaraporn W, Egbert G, Uyeshima M. Interpretation of 2-D Magnetotelluric Profile Data with 3-D Inversion, Synthetic Examples[J]. Geophysical Journal International, 2005, 160(3):804-814.
[14] Siripunvaraporn W, Egbert G. WSINV3DMT: Vertical magnetic field transfer function inversion and parallel implementation[J]. Physics of the Earth & Planetary Interiors, 2009, 173(s 3–4):317-329.
[15] 戴世坤,徐世浙.MT二维连续介质快速反演[J].石油地球物理勘探,1997(03):305-317+462.DAI S K, XU S Z.MT two dimensional continuous medium inversion [J]. Oil Geophysical Prospecting, 1997(03):305-317+462. (In Chinese)
[2] 刘国栋,赵国泽. 大地电磁法新进展[J]. 地球科学进展,1994(04):97-100.LIU G D,ZHAO G Z. New advance of magnetotelluric sounding[J]. Advance in Earth Sciences,1994(04):97-100. (In Chinese)
[3] 赵国泽,陈小斌,汤吉. 中国地球电磁法新进展和发展趋势[J]. 地球物理学展,2007(04):1171-1180.ZHAO G Z,CHEN X B,TANG J.Advanced geo-electromagnetic methods in China[J].Progress in Geophysics,2007(04):1171-1180. (In Chinese)
[4] 魏文博. 我国大地电磁测深新进展及瞻望[J]. 地球物理学进展,2002(02):245-254.WEI W B. New advance and prospect of magnetotelluricsounding(MT) in China[J] . Progress in Geophysics, 2002(02):245-254. (In Chinese)
[5] SMITH J T,BOOBER J R.Rapid inversion of two-and three-dimensional magnetotelluric data[J]. Chinese Journal of Geophysics,1991, 96(96):3905-3922.
[6] RODIW,MACKIE R L.Nonlinear conjugate gradients algorithm for 2-D magnetotelluricinversion[J]. Geophysics,2001,66(1):174-187.
[7] 叶涛,陈小斌,严良俊. 大地电磁资料精细处理和二维反演解释技术研究(三)——构建二维反演初始模型的印模法[J]. 地球物理报,2013(10):3596-3606.YE T,CHEN X B,YAN L J.Refinedtechnigues for data processing and two-dimensional inversion in magnetotelluric (Ⅲ):using the Impressing Method to construct starting model of 2D magnetotelluric inversion of two-and three-dimensional magneto-telluric data[J]. Chinese Journal of Geophysics,2013(10):3596-3606. (In Chinese)
[8] 余年. 大地电磁二、三维倾子正演模拟与联合反演研究[D].成都:成都理工大学,2012.YU N.2D/3D Tipper forward modeling and joint inversion of magnetotelluric[D].Chengdu:Chengdu University of Technology,2012. (In Chinese)
[9] 胡祖志,胡祥云. 大地电磁三维反演方法综述[J]. 地球物理学进展,2005(01):214-220.HU Z Z,HU X Y.Review of three dimensional magnetotelluric inversion methods[J].Progress Geophysics in,2005(01):214-220. (In Chinese)
[10] LEDO J. 2-D versus 3-D magnetotelluric data interpretation[J].Surv Geophys,2006(27):511-543.
[11] 蔡军涛,陈小斌.大地电磁资料精细处理和二维反演解释技术研究(二)—反演数据极化模式选择[J].地球物理学报,2010,53(11):2703-2714.CAI J T,CHEN X B.Refined techniques for data processing and two-dimensional inversion In magnetotelluricⅡ:Which data polarization mode should be used in 2D inversion[J]. Chinese Journal of Geophysics, 2010,53(11): 2703-2714. (In Chinese)
[12] SIRIPUNVARAPORN W, EGBERT G. An efficient data-subspace inversion method for 2-D magnetotelluric data[J]. Geophysics, 2000, 65(3):791.
[13] Siripunvaraporn W, Egbert G, Uyeshima M. Interpretation of 2-D Magnetotelluric Profile Data with 3-D Inversion, Synthetic Examples[J]. Geophysical Journal International, 2005, 160(3):804-814.
[14] Siripunvaraporn W, Egbert G. WSINV3DMT: Vertical magnetic field transfer function inversion and parallel implementation[J]. Physics of the Earth & Planetary Interiors, 2009, 173(s 3–4):317-329.
[15] 戴世坤,徐世浙.MT二维连续介质快速反演[J].石油地球物理勘探,1997(03):305-317+462.DAI S K, XU S Z.MT two dimensional continuous medium inversion [J]. Oil Geophysical Prospecting, 1997(03):305-317+462. (In Chinese)