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。

公开(公告)号：US5933789A

公开(公告)日：1999-08-03

申请号：US745452

申请日：1996-11-12

申请人： Bok S. Byun ,  David D. Thompson ,  E. Stuart Nelan

发明人： Bok S. Byun ,  David D. Thompson ,  E. Stuart Nelan

IPC分类号： G06F17/10 ,  G06F19/00

CPC分类号： G06F17/10

摘要： A method and computer system for deriving and applying normal moveout phase and time shift corrections to seismic survey traces is disclosed. Normal moveout time-shift corrections are first applied to traces in a common midpoint (CMP) or common depth point (CDP) gather, based upon stacking velocity analysis applied to envelopes of the traces. One offset in the survey, preferably the maximum offset, is selected as the reference point; the NMO time shift at this reference offset is then selected as a reference NMO time-shift. The traces in the gather are each phase-shifted based upon iterated reference phase dispersion values at the reference offset, times the ratio of the normal moveout time-shifts for the trace in the gather to that of the reference offset (raised to a power). Semblance analysis is performed to identify, for each point in normal incidence time and thus for each reflective event, the optimum reference phase dispersion value. Phase corrections, based upon the optimum reference phase dispersion value as a function of normal incidence time multiplied by the ratio of the normal moveout trace and reference time shifts, are then applied to the traces in the gather. Interpolation may be used to define the optimum reference phase dispersion for CMP gathers lying between the midpoints of analyzed gathers.

摘要翻译： 公开了一种用于导出和应用正常移动相位和时移校正到地震勘测轨迹的方法和计算机系统。 基于应用于迹线包络的堆积速度分析，正常移动时移校正首先应用于公共中点（CMP）或公共深度点（CDP）集合中的迹线。 选择调查中的一个偏移量，优选最大偏移量作为参考点; 然后选择该参考偏移处的NMO时移作为参考NMO时移。 基于在参考偏移处的迭代参考相位色散值，聚集中的迹线每次相移，乘以集合中的迹线的正常移动时移与参考偏移（提升为功率）的比例。 。 执行相似度分析，以识别对于正常入射时间中的每个点，并且因此针对每个反射事件，确定最佳参考相位色散值。 然后将基于作为正常入射时间的函数的最佳参考相位色散值乘以正常偏移轨迹和参考时间偏移的比率的相位校正应用于聚集中的迹线。 可以使用插值来定义位于分析的聚集的中点之间的CMP聚集的最佳参考相位色散。

公开(公告)号：US5684754A

公开(公告)日：1997-11-04

申请号：US571459

申请日：1995-12-13

申请人： Bok S. Byun ,  E. Stuart Nelan

发明人： Bok S. Byun ,  E. Stuart Nelan

IPC分类号： G01V1/36 ,  G01V1/28

CPC分类号： G01V1/362 ,  G01V2210/52

摘要： A computer-implemented method and system of correcting seismic survey data for the effects of NMO stretch is disclosed. The method operates upon a CDP gather of seismic survey data after normal move-out correction (NMO) has been applied. A semblance analysis is used to derive a stretch coefficient .kappa. profile over the gather, as a function of time and offset. The values of the stretch coefficient profile .kappa. are used in producing a time-varying filter that is applied, preferably by way of a time-domain multiplication, to incremental windows in time for each trace, with the products added to one another to generate a corrected trace. After all of the traces in the gather are corrected, an event-weighted filter is applied to the traces by way of a correlation operation, to remove high-frequency artifacts in the corrected traces. The corrected and filtered traces are then ready for stacking and conventional processing.

摘要翻译： 公开了一种用于校正NMO拉伸效应的地震勘测数据的计算机实现方法和系统。 该方法运用于采用正常移出校正（NMO）后的地震勘测数据的CDP采集。 使用相似度分析作为时间和偏移的函数导出聚集上的拉伸系数kappa轮廓。 拉伸系数分布kappa的值用于产生时间优先通过时域乘法运算的时变滤波器到每个迹线的时间上的增量窗口，产品相互添加以产生 纠正痕迹。 在集合中的所有迹线被校正之后，通过相关运算将事件加权滤波器应用于迹线，以去除校正后的迹线中的高频伪像。 然后校正和过滤的迹线可以进行堆叠和常规处理。

公开(公告)号：US20090052279A1

公开(公告)日：2009-02-26

申请号：US11842339

申请日：2007-08-21

申请人： Charles Sicking ,  E. Stuart Nelan ,  William H. McLain

发明人： Charles Sicking ,  E. Stuart Nelan ,  William H. McLain

IPC分类号： G01V1/28

CPC分类号： G01V1/288 ,  G01V1/303

摘要： A method and system determines optimum azimuth parameters for seismic data processing. The method includes selecting a range of azimuth parameters, the azimuth parameters indicating the range of magnitudes and directions, each pair of azimuth parameters indicating a particular magnitude and a particular direction. The method further includes generating a plurality of seismic gathers wherein a seismic gather is generated from each pair of azimuth parameters, each seismic gather including a plurality of seismic data traces. The method further includes generating a plurality of seismic gathers for a plurality of imaging locations and a plurality of depths, each seismic gather containing a plurality of seismic data traces. The method further includes determining the coherence amplitude of each gather. The method further includes determining the gather having the optimum coherence amplitude, and selecting the azimuth parameters associated with the gather having the optimum coherence amplitude.

摘要翻译： 方法和系统确定地震数据处理的最佳方位参数。 该方法包括选择方位参数的范围，指示幅度和方向的范围的方位角参数，每对方位参数指示特定的幅度和特定的方向。 该方法还包括生成多个地震​​聚集，其中从每对方位参数生成地震聚集，每个地震采集包括多个地震数据迹线。 该方法还包括为多个成像位置和多个深度产生多个地震采集，每个地震采集包含多个地震数据迹线。 该方法还包括确定每个聚集的相干幅度。 该方法还包括确定具有最佳相干幅度的聚集，以及选择与具有最佳相干幅度的聚集相关联的方位角参数。