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2. 发明授权

US6026057A Method and system for correcting for offset-dependent directivity effects in seismic survey signals 失效
标题翻译：用于校正地震测量信号中偏移相关方向性影响的方法和系统
公开(公告)号：US6026057A
公开(公告)日：2000-02-15
申请号：US90432
申请日：1998-06-04
申请人： Bok S. Byun , E. Stuart Nelan , Chi Young
发明人： Bok S. Byun , E. Stuart Nelan , Chi Young
IPC分类号： G01V1/36
CPC分类号： G01V1/36 , G01V2210/52 , G01V2210/59
摘要： A method and computer system for correcting seismic signals in a seismic survey, sensed in horizontal and vertical directions at receiver locations, is disclosed. According to the disclosed method and system, the horizontal and vertical seismic signal traces are processed in prestack gathers, after normal move-out correction. For each reflection event indicated in the prestack gathers, a performance function is evaluated over a range of zero-offset directivity and directivity slope values, using the horizontal and vertical pressure wave components sensed at the receivers. The zero-offset directivity and directivity slope values that return the maximum performance function are stored in connection with the gather and the reflection event, as indicative of the zero-offset dip and offset-dependent directivity of the reflective surface corresponding to the reflected event. These zero-offset directivity and directivity slope values are then used to correct the traces, or generate a new trace, corresponding to the pressure wave signal that is in the true reflected wave ray direction, minimizing the component of the sensed pressure wave that is transverse to the longitudinal wave ray direction. Detection and analysis of pressure-to-shear wave conversion, as well as amplitude-versus-offset analysis, is then facilitated by the present invention.
摘要翻译：公开了一种用于校正在接收器位置处在水平和垂直方向上感测的地震勘测中的地震信号的方法和计算机系统。根据所公开的方法和系统，在正常移出校正之后，水平和垂直地震信号迹线在叠前聚集中进行处理。对于在叠前聚集中指示的每个反射事件，使用在接收器处感测的水平和垂直压力波分量，在零偏移方向性和方向性斜率值的范围上评估性能函数。返回最大性能函数的零偏移方向性和方向性斜率值与收集和反射事件相关联地存储，表示与反射事件相对应的反射表面的零偏移倾斜和与偏移相关的方向性。然后使用这些零偏移方向性和方向性斜率值来校正迹线，或者产生对应于真实反射波长方向的压力波信号的新迹线，从而将检测到的压力波的分量最小化为横向到纵向波长方向。然后通过本发明促进压力 - 剪切波转换的检测和分析以及振幅对偏移分析。

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