滑动扫描可控震源地震数据谐波干扰的消除方法
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摘要
滑动扫描技术由于缩短了相邻两炮的滑动时间,使得采集效率得到很大提高,同时也使得后一炮中的谐波畸变对前一炮的基波产生影响,降低了地震资料的质量。对扫描信号进行时频分析,利用基波及谐波相关后的特征,设计出提取谐波的算子。将该算子作用于相关前原始地震记录,可以提取记录中的高阶谐波。实际资料处理前、后的时频分析验证了该方法的效果。
To improve the efficiency of acquisition,one vibrator group starts sweeping without waiting for the previous group's sweep to terminate,this is called "slip sweep".But this arrangement will generate harmonic noise in the previous shot record from the next shot and result in seismic data quality reduction.We analyzed the sweep signal in time-frequency domain and designed a harmonic separated operator by utilizing the correlated characteristics of harmonic distortion and fundamental signal.By applying this harmonic separated operator to the uncorrelated raw seismic data,high-order harmonic noise will be obtained.The comparison analysis of time-frequency maps between conventional record and harmonic noise removing record shows that the effect of this high-order harmonic noise attenuation method is effective.
To improve the efficiency of acquisition,one vibrator group starts sweeping without waiting for the previous group's sweep to terminate,this is called "slip sweep".But this arrangement will generate harmonic noise in the previous shot record from the next shot and result in seismic data quality reduction.We analyzed the sweep signal in time-frequency domain and designed a harmonic separated operator by utilizing the correlated characteristics of harmonic distortion and fundamental signal.By applying this harmonic separated operator to the uncorrelated raw seismic data,high-order harmonic noise will be obtained.The comparison analysis of time-frequency maps between conventional record and harmonic noise removing record shows that the effect of this high-order harmonic noise attenuation method is effective.
引文
[1]Rozemond H J.Slip sweep acquisition[J].Expand-ed Abstracts of66th Annual Internat SEG Mtg,1996,67-67
[2]Seriff A J,Kim W H.The effect of harmonic distor-tion in the use of vibratory surface sources[J].Geo-physics,1970,35(2):234-246
[3]Sallas J J.Seismic vibrator control and the downgo-ing P-wave[J].Geophysics,1984,49(6):735-740
[4]Schrodt J K.Techniques for improving Vibroseis data[J].Geophysics,1987,52(4):469-482
[5]Martin J E,White R.E.Two methods for continu-ous monitoring of harmonic distortion in vibroseis signals[J].Geophysical Prospecting,1989,37(7):851-872
[6]Reust D K.Vibrator force control:how simple can it get?[J].The Leading Edge,1995,14(11):1129-1133
[7]Lebedev A V,Beresnev L A.Nonlinear distortion of signals radiated by vibroseis sources[J].Geo-physics,2004,69(4):968-977
[8]Lebedev A V,Beresnev L A,Vermeer P L.Model parameters of the nonlinear stiffness of the vibrator-ground contact determined by inversion of vibrator accelerometer data[J].Geophysics,2006,71(3):25-32
[9]Okaya D A,Karageorgi E,McEvilly T V.Remo-ving vibrator-induced correlation artifacts by filte-ring in frequency-uncorrelated time space[J].Geo-physics,1992,57(7):916-926
[10]Li X P.Decomposition of vibroseis data by multiple filter technique[J].Expanded Abstracts of64th An-nual Internat SEG Mtg,1994,711-714
[11]Li X P,Sollner W,Hubral P.Elimination of har-monic distortion in vibroseis data[J].Geophyscis,1995,60(2):503-516
[12]Li X P,Richwalski S.Seismic attenuation and ve-locities of P-and S-waves in the German KTB area[J].Journal of Applied Geophysics,1996,36(2):67-76
[13]Li X P.Decomposition of vibroseis data by the mul-tiple filter technique[J].Geophysics,1997,62(3):980-991
[14]Li X P,Hubral P.Harmonic distortion in vibroseis data and its elimination[J].Expanded Abstracts of 65th Annual Internat SEG Mtg,1995,1010-1013
[15]Ras P,Daly M,Baeten G,et al.Harmonic distor-tion in slip sweep records[J].Expanded Abstracts of69th Annual Internat SEG Mtg,1999,609-612
[16]Dal Moro G,Scholtz P,Iranpour K.Harmonic noise attenuation for vibroseis data[J].GNGTS,2007,3(2):511-513
[17]Cao W X.To attenuate harmonic distortion by the force signal of vibrator[J].Expanded Abstracts of 80th Annual Internat SEG Mtg,2010,157-161
[2]Seriff A J,Kim W H.The effect of harmonic distor-tion in the use of vibratory surface sources[J].Geo-physics,1970,35(2):234-246
[3]Sallas J J.Seismic vibrator control and the downgo-ing P-wave[J].Geophysics,1984,49(6):735-740
[4]Schrodt J K.Techniques for improving Vibroseis data[J].Geophysics,1987,52(4):469-482
[5]Martin J E,White R.E.Two methods for continu-ous monitoring of harmonic distortion in vibroseis signals[J].Geophysical Prospecting,1989,37(7):851-872
[6]Reust D K.Vibrator force control:how simple can it get?[J].The Leading Edge,1995,14(11):1129-1133
[7]Lebedev A V,Beresnev L A.Nonlinear distortion of signals radiated by vibroseis sources[J].Geo-physics,2004,69(4):968-977
[8]Lebedev A V,Beresnev L A,Vermeer P L.Model parameters of the nonlinear stiffness of the vibrator-ground contact determined by inversion of vibrator accelerometer data[J].Geophysics,2006,71(3):25-32
[9]Okaya D A,Karageorgi E,McEvilly T V.Remo-ving vibrator-induced correlation artifacts by filte-ring in frequency-uncorrelated time space[J].Geo-physics,1992,57(7):916-926
[10]Li X P.Decomposition of vibroseis data by multiple filter technique[J].Expanded Abstracts of64th An-nual Internat SEG Mtg,1994,711-714
[11]Li X P,Sollner W,Hubral P.Elimination of har-monic distortion in vibroseis data[J].Geophyscis,1995,60(2):503-516
[12]Li X P,Richwalski S.Seismic attenuation and ve-locities of P-and S-waves in the German KTB area[J].Journal of Applied Geophysics,1996,36(2):67-76
[13]Li X P.Decomposition of vibroseis data by the mul-tiple filter technique[J].Geophysics,1997,62(3):980-991
[14]Li X P,Hubral P.Harmonic distortion in vibroseis data and its elimination[J].Expanded Abstracts of 65th Annual Internat SEG Mtg,1995,1010-1013
[15]Ras P,Daly M,Baeten G,et al.Harmonic distor-tion in slip sweep records[J].Expanded Abstracts of69th Annual Internat SEG Mtg,1999,609-612
[16]Dal Moro G,Scholtz P,Iranpour K.Harmonic noise attenuation for vibroseis data[J].GNGTS,2007,3(2):511-513
[17]Cao W X.To attenuate harmonic distortion by the force signal of vibrator[J].Expanded Abstracts of 80th Annual Internat SEG Mtg,2010,157-161
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