基于Alford旋转的转换波各向异性校正技术
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摘要
横波穿过裂缝时会分裂为沿着裂缝的快横波和垂直裂缝的慢横波,在转换波处理时为了提高径向分量的成像质量,通常需要进行横波分裂方位各向异性校正处理。为此,通过构建互相垂直的径向和横向分量对,实现了Al-ford旋转方法对转换波数据的快慢横波分离,并完成了转换横波分裂方位各向异性校正处理。首先,在浅层时窗内根据快、慢横波分离方法得到裂缝方向以及快、慢横波,并求取快、慢横波之间的时延;然后,将时延应用于慢横波作时延补偿;最后,将快横波和时延补偿后的慢横波旋转回原来的径向和横向方向,得到新的径向和横向分量。依照该方法对川西地区地震勘探资料中深层或深层时窗内的转换波数据进行处理,大大改善了转换波径向分量的成像质量。
When crossing a fracture,a shear wave may split into a rapid shear wave propagating along the fracture and a slow shear wave propagating perpendicular to the fracture.In order to improve the imaging quality of radial component,azimuthal anisotropic correction for shear wave splitting should be performed during the processing of the converted waves.After creating a component pair with the radial and lateral components perpendicular to each other,the Alford Rotation Method is used to split the converted waves into a rapid and a slow shear wave,and to perform azimuthal anisotropic correction for shear wave splitting.First,fracture orientation and the rapid and slow shear waves are obtained in the shallow layer,and the time lag between the rapid and slow shear waves is also calculated.Then,the time lag is used to compensate the slow shear wave.Finally,the rapid shear wave and the time-lag-compensated slow shear wave are rotated to their original radial and lateral orientation respectively,obtaining new radial and lateral components.With this method adopted to process the converted wave data in medium-to-deep or deep layers in the western Sichuan Basin,the imaging quality of the radial component of the converted waves has been significantly improved.
When crossing a fracture,a shear wave may split into a rapid shear wave propagating along the fracture and a slow shear wave propagating perpendicular to the fracture.In order to improve the imaging quality of radial component,azimuthal anisotropic correction for shear wave splitting should be performed during the processing of the converted waves.After creating a component pair with the radial and lateral components perpendicular to each other,the Alford Rotation Method is used to split the converted waves into a rapid and a slow shear wave,and to perform azimuthal anisotropic correction for shear wave splitting.First,fracture orientation and the rapid and slow shear waves are obtained in the shallow layer,and the time lag between the rapid and slow shear waves is also calculated.Then,the time lag is used to compensate the slow shear wave.Finally,the rapid shear wave and the time-lag-compensated slow shear wave are rotated to their original radial and lateral orientation respectively,obtaining new radial and lateral components.With this method adopted to process the converted wave data in medium-to-deep or deep layers in the western Sichuan Basin,the imaging quality of the radial component of the converted waves has been significantly improved.
引文
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[8]马昭军,唐建明,杨振武,等.三维转换波处理方法研究与应用[J].天然气工业,2007,27(增刊1):213-215.
[2]LI Xiangyang,CRAMPIN S.Line-transform techniques forprocessing shear-wave anisotropy in four-component seis-mic data[J].Geophysics,1993,58(2):240-256.
[3]马昭军,唐建明,徐天吉.多波多分量地震勘探技术研究进展[J].勘探地球物理进展,2010,33(4):247-253.
[4]唐建侯,贺振华,黄德济.角度谱的原理及计算方法[J].石油物探,2003,42(2):196-199.
[5]唐建侯,杨慧珠,贺振华,等.P-SV快慢波旋转分离公式研究[J].天然气工业,2004,24(12):44-47.
[6]黄东山,谢芳,李忠,等.多波多分量技术在广安构造中的初步应用[J],天然气工业,2006,26(8):44-46.
[7]马昭军,唐建明.叠前时间偏移技术在三维转换波处理中的应用[J].石油物探,2007,46(2):174-180.
[8]马昭军,唐建明,杨振武,等.三维转换波处理方法研究与应用[J].天然气工业,2007,27(增刊1):213-215.
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