角度域合成地震记录制作
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摘要
角度域合成地震记录的制作不同于常规合成地震记录的制作。当入射角大于临界角时,反射系数变为复数,取反射系数的模在时间域内作合成地震记录,不能如实地反映波形的相位信息。利用Zoeppritz方程简化近似的纵波任意角度入射时的反射系数公式计算反射系数,通过傅立叶变换,在频率域内实现了大角度复反射系数下的合成地震记录制作;利用给出的处理流程,实现了角度域合成地震记录的制作。为进一步研究井间地震资料处理中角度域波形畸变校正方法提供了基础数据。
Seismic synthetic record in common angle domain is different from conventional one. When incident angle is greater than critical angle, reflection coefficient becomes complex number. To calculated the modulus of reflection coefficient and to make synthetic seismogram in time domain do not present the phase message of waveform. This paper calculates the reflection coefficient using approximate formula derived from Zoeppritz equation for any incident angle. Using Fourier transform, big angle seismic record with complex coefficient is modeled in frequency domain. Using given treatment scheme, synthetic seismogram is modeled in angle domain. This provides basic data for the study of waveform deformation correction method in cross-well seismic data processing.
Seismic synthetic record in common angle domain is different from conventional one. When incident angle is greater than critical angle, reflection coefficient becomes complex number. To calculated the modulus of reflection coefficient and to make synthetic seismogram in time domain do not present the phase message of waveform. This paper calculates the reflection coefficient using approximate formula derived from Zoeppritz equation for any incident angle. Using Fourier transform, big angle seismic record with complex coefficient is modeled in frequency domain. Using given treatment scheme, synthetic seismogram is modeled in angle domain. This provides basic data for the study of waveform deformation correction method in cross-well seismic data processing.
引文
[1]陆基孟.地震勘探原理[M].山东东营:石油大学出版社,1993:340-350.
[2]李晶,陈裕明,唐湘荣.合成记录得改进方法及在地震相对比中的应用[J].新疆石油地质,2001,22(4):297-302.
[3]刘治凡.利用VSP资料标定层位[J].新疆石油地质,2002,23(3):252-254.
[4]王小六,李振春,曹文俊.广角地震采集综述[J].勘探地球物理进展,2004,27(5):321-326.
[5]王学军,马劲风.考虑振幅随炮检距变化的人工合成地震记录制作方法[J].石油地球物理勘探,2001,26(1):30-36.
[6]Aki K I,Ricards P G.Quantitative seismology theory and methods[M].USA:Freeman WH and Company,1980.
[7]Shuey R T.A simplification of the Zoeppritz equations[J].Geophysics,1985,50(4):609-614.
[8]Robert S R,Williams H.Amplitude-versus-offset variations in gas sands[J].Geophysics.1989,54(6):680-688.
[9]Gardner G H F,Gardner LW,Gregory A R.Formation veloc-ity and density:the diagnostic basic for stratigraphic traps[J].Geophysics,1974,39(6):770-780.
[2]李晶,陈裕明,唐湘荣.合成记录得改进方法及在地震相对比中的应用[J].新疆石油地质,2001,22(4):297-302.
[3]刘治凡.利用VSP资料标定层位[J].新疆石油地质,2002,23(3):252-254.
[4]王小六,李振春,曹文俊.广角地震采集综述[J].勘探地球物理进展,2004,27(5):321-326.
[5]王学军,马劲风.考虑振幅随炮检距变化的人工合成地震记录制作方法[J].石油地球物理勘探,2001,26(1):30-36.
[6]Aki K I,Ricards P G.Quantitative seismology theory and methods[M].USA:Freeman WH and Company,1980.
[7]Shuey R T.A simplification of the Zoeppritz equations[J].Geophysics,1985,50(4):609-614.
[8]Robert S R,Williams H.Amplitude-versus-offset variations in gas sands[J].Geophysics.1989,54(6):680-688.
[9]Gardner G H F,Gardner LW,Gregory A R.Formation veloc-ity and density:the diagnostic basic for stratigraphic traps[J].Geophysics,1974,39(6):770-780.
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