三维转换波处理技术在新场地区的应用
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摘要
随着多分量全数字地震仪的迅速发展和采集方法的改进,三维转换波地震勘探在全球的油气勘探中呈现上升趋势,但大多数实际勘探效果尚未取得理论上的期望成果,一个重要原因是因为三维转换波本身的特殊性,不能采用常规的纵波处理技术来实现,而三维转换波处理技术尚待完善。依据新场地区的宽方位三维三分量资料,进行了三维转换波处理技术的研究与应用,主要包括,从采集坐标到处理坐标的坐标旋转技术、根据信号和噪音不相关性去噪的矢量滤波技术、基于构造时间控制的转换波静校正技术、四参数各向异性速度分析技术以及转换波叠前克希霍夫时间偏移技术。经这些技术处理后的新场地区转换波叠前时间偏移叠加剖面,成像清晰,归位准确,地质形态好,与纵波剖面具有一致的构造特征和良好的匹配关系。
With the fast development of multi-component digital seismograph and the improvement of acquisition methods,3D converted wave seismic exploration tends to be more and more applied to global oil-gas exploration.However,most of real effects are almost all less than those by theoretical expectations.One important reason is that the 3D converted wave processing is to be improved for it does not allow to be processed by conventional P-wave technique.This paper presents the research of this 3D converted wave processing technique by the wide-azimuth 3D and 3-component data from Xinchang area,including coordinate rotation from acquired coordinate to processing coordinate,vector filter for denoise based on non-correlation between the signals and the noises,structural time-controlling converted wave static correction,four-parameter anisotropic velocity analysis and converted wave pre-stack Kirchhoff time migration techniques.Following processing by these techniques,the pre-stack time migration-stack profiles are clearer in imaging,more accurate in location,better in geological configuration and more accordant with the P-wave profiles in structure.
With the fast development of multi-component digital seismograph and the improvement of acquisition methods,3D converted wave seismic exploration tends to be more and more applied to global oil-gas exploration.However,most of real effects are almost all less than those by theoretical expectations.One important reason is that the 3D converted wave processing is to be improved for it does not allow to be processed by conventional P-wave technique.This paper presents the research of this 3D converted wave processing technique by the wide-azimuth 3D and 3-component data from Xinchang area,including coordinate rotation from acquired coordinate to processing coordinate,vector filter for denoise based on non-correlation between the signals and the noises,structural time-controlling converted wave static correction,four-parameter anisotropic velocity analysis and converted wave pre-stack Kirchhoff time migration techniques.Following processing by these techniques,the pre-stack time migration-stack profiles are clearer in imaging,more accurate in location,better in geological configuration and more accordant with the P-wave profiles in structure.
引文
[1]唐建明,马昭军.宽方位三维三分量地震资料采集观测系统设计——以新场气田三维三分量勘探为例[J].石油物探,2007,4(6 3):310-318.
[2]Perelberg A I,Hornbostes S C.Applications of seismic polar-ization analysis[J].Geophysics,1994,59(1):119-130.
[3]Li Xiangyang,Yuan Jianxin,Richard Bale.Converted-wave traveltime equationsin layered anisotropic media:an overview[J].EAGE 65th Conference&Exhibition,2003:2-5.
[4]Li Xiangyang,Yuan Jianxin.Converted-wave moveout and conversion-point equations in layered VTI media:theory and applications[J].Journal of Applied Geophysics,2003,54:297-318.
[2]Perelberg A I,Hornbostes S C.Applications of seismic polar-ization analysis[J].Geophysics,1994,59(1):119-130.
[3]Li Xiangyang,Yuan Jianxin,Richard Bale.Converted-wave traveltime equationsin layered anisotropic media:an overview[J].EAGE 65th Conference&Exhibition,2003:2-5.
[4]Li Xiangyang,Yuan Jianxin.Converted-wave moveout and conversion-point equations in layered VTI media:theory and applications[J].Journal of Applied Geophysics,2003,54:297-318.
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