基于Robust的AMT阻抗张量估计算法参数影响研究
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摘要
针对云南省澜沧多金属矿区AMT实测数据开展Robust阻抗估算的参数影响研究,挑选两个实测点数据进行相干因子估算和电阻率离差估算,得到其视电阻率和相位曲线图,分别对其进行讨论。经过Robust阻抗估算法处理过后的数据可以明显看出,只进行相干因子估算处理后数据其视电阻率高频段部分有明显的缓和,走势更平滑,在相位低频段部分跳点减少,数据得到改善;而当数据低频段跳点较多时只进行电阻率离差估算处理的效果更好,其相位曲线圆滑程度改善,中低频段数据离差小,数据稳定,飞点减少。研究结果表明,Robust阻抗估算法可以有效抑制非高斯噪声的AMT实测数据,平滑曲线,使高频段更接近实际地质情况。
Acrodding of AMT date in Yun Nan province polymetallic mine,influence on characteristic of Robust method are studied. The curves of apparent resistivity and phase cause coherency weighted and resistivity varience weighting estimation are discussed. The data is clearly been much better after take Robust method: the high frequency of apparent resistivity of data is obvious alleviation after Coherent estimate,much smooth and less jumppoints in low frequency of phase curve. choose rho-resistivity estimate better while more jump-points in low frequency,improve the degree of phase curve smooth,make middle-low frequency data deviation small,less flypoints. In any case,the data was much stable when taking Robust method. The results showed that Robust method could restrain the gaussian noise of AMT data,smooth the curve,make the high frequencies more closer to the actual geological conditions.
Acrodding of AMT date in Yun Nan province polymetallic mine,influence on characteristic of Robust method are studied. The curves of apparent resistivity and phase cause coherency weighted and resistivity varience weighting estimation are discussed. The data is clearly been much better after take Robust method: the high frequency of apparent resistivity of data is obvious alleviation after Coherent estimate,much smooth and less jumppoints in low frequency of phase curve. choose rho-resistivity estimate better while more jump-points in low frequency,improve the degree of phase curve smooth,make middle-low frequency data deviation small,less flypoints. In any case,the data was much stable when taking Robust method. The results showed that Robust method could restrain the gaussian noise of AMT data,smooth the curve,make the high frequencies more closer to the actual geological conditions.
引文
陈海燕,景建恩,魏文博.2012.广义S变换及其在大地电磁测深数据处理中的应用[J].地球物理学进,27(3):988-996.
景建恩,魏文博,陈海燕.2012.基于广义S变换的大地电磁测深数据处理[J].地球物理学报,55(12):4015-4022.
柳建新,严家斌,何继善,等.2003.基于相关系数的海底大地电磁阻抗Robust估算方法[J].地球物理学报,46(2):241-245.
邵昌盛.2009.几种去噪方法在L_L深部铜矿勘探中的应用[D].成都:成都理工大学.
汤井田,李晋,肖晓.2012a.数学形态滤波与大地电磁噪声压制[J].地球物理学报,55(5):1784-1793.
汤井田,李晋,肖晓.2012b.基于数学形态滤波的大地电磁强干扰分离方法[J].中南大学学报:自然科学版,43(6):2215-2221.
汤井田,张驰,肖晓.2013.大地电磁阻抗估计方法对比[J].中国有色金属学报,23(9):2352-2358.
杨生,姚治龙,刘俊昌.2002.冀北坳陷大地电磁测深研究[J].中国地质,29(4):421-425.
张驰.2013.大地电磁数据质量评价与阻抗估计[J].长沙:中南大学.
张刚,王绪本,张伟,等.2011.重复中位数估计Robust算法在长周期大地电磁中的应用[J].物探与化探,35(6):813-816.
张伟.2011.长周期大地电磁法信号处理关键技术与应用[J].成都:成都理工大学.
Chave A D,Thomson D J.2003.A bounded influence regression estimator based on the statistics of the hat matrix[J].Journal of the Royal Statistical Society:Series C(Applied Statistics),52(3):307-322.
Chave A D,Thomson D J.2004.Bounded influence magnetotelluric response function estimation[J].Geophysical Journal International,157(3):988-1006.
Claerbout Jon F,Muir Francis.1973.Robust modeling with erratic data[J].Geophysics,38(5):826-844.
Egbert G,Booker J.1986.Robust estimation of geomagnetic transfer functions[J].Geophys.J.R.,87:173-194.
Gamble T D,Goubau W.1978.Error analysis for remote reference magnetotellurics[J].Geophysics,44:959-968.
Gamble T D,Goubau W M,Clarke J.1979.Magnetotellurics with a remote reference[J].Geophysics,44:53-68.
Huber P J.1981.Robust Statistics[M].New York:John Wiley:308.
Mufloz G,Ritter O.2013.Remote reference processing of magnetotelluric data:a fast and efficient data acquisition scheme for local arrays[J].Geophysical Prospecting,61:300-316.
Stodt J.2006.Noise analysis for conventional and remote reference magnettotellurics[J].Ph.D.thesis,Univ.of Utah,Salt Lake City.
Sutarno D K vozoff.2008.Development of robust magnetotelluric impedance estimation:A review[J].Indonesian Journal of Physics,16(3):79-89.
景建恩,魏文博,陈海燕.2012.基于广义S变换的大地电磁测深数据处理[J].地球物理学报,55(12):4015-4022.
柳建新,严家斌,何继善,等.2003.基于相关系数的海底大地电磁阻抗Robust估算方法[J].地球物理学报,46(2):241-245.
邵昌盛.2009.几种去噪方法在L_L深部铜矿勘探中的应用[D].成都:成都理工大学.
汤井田,李晋,肖晓.2012a.数学形态滤波与大地电磁噪声压制[J].地球物理学报,55(5):1784-1793.
汤井田,李晋,肖晓.2012b.基于数学形态滤波的大地电磁强干扰分离方法[J].中南大学学报:自然科学版,43(6):2215-2221.
汤井田,张驰,肖晓.2013.大地电磁阻抗估计方法对比[J].中国有色金属学报,23(9):2352-2358.
杨生,姚治龙,刘俊昌.2002.冀北坳陷大地电磁测深研究[J].中国地质,29(4):421-425.
张驰.2013.大地电磁数据质量评价与阻抗估计[J].长沙:中南大学.
张刚,王绪本,张伟,等.2011.重复中位数估计Robust算法在长周期大地电磁中的应用[J].物探与化探,35(6):813-816.
张伟.2011.长周期大地电磁法信号处理关键技术与应用[J].成都:成都理工大学.
Chave A D,Thomson D J.2003.A bounded influence regression estimator based on the statistics of the hat matrix[J].Journal of the Royal Statistical Society:Series C(Applied Statistics),52(3):307-322.
Chave A D,Thomson D J.2004.Bounded influence magnetotelluric response function estimation[J].Geophysical Journal International,157(3):988-1006.
Claerbout Jon F,Muir Francis.1973.Robust modeling with erratic data[J].Geophysics,38(5):826-844.
Egbert G,Booker J.1986.Robust estimation of geomagnetic transfer functions[J].Geophys.J.R.,87:173-194.
Gamble T D,Goubau W.1978.Error analysis for remote reference magnetotellurics[J].Geophysics,44:959-968.
Gamble T D,Goubau W M,Clarke J.1979.Magnetotellurics with a remote reference[J].Geophysics,44:53-68.
Huber P J.1981.Robust Statistics[M].New York:John Wiley:308.
Mufloz G,Ritter O.2013.Remote reference processing of magnetotelluric data:a fast and efficient data acquisition scheme for local arrays[J].Geophysical Prospecting,61:300-316.
Stodt J.2006.Noise analysis for conventional and remote reference magnettotellurics[J].Ph.D.thesis,Univ.of Utah,Salt Lake City.
Sutarno D K vozoff.2008.Development of robust magnetotelluric impedance estimation:A review[J].Indonesian Journal of Physics,16(3):79-89.