Method for imaging of pre-stack seismic data
    1.
    发明授权
    Method for imaging of pre-stack seismic data 失效
    叠前地震数据成像方法

    公开(公告)号:US07286690B2

    公开(公告)日:2007-10-23

    申请号:US10692185

    申请日:2003-10-23

    IPC分类号: G06K9/00

    CPC分类号: G01V1/28 G01V2210/57

    摘要: Prestack seismic data is imaged by calculating an individual reflectivity for each frequency in the seismic data. Then, a mean reflectivity is calculating over the individual reflectivities. A variance is calculated for the set of reflectivities versus frequency. A second variance is calculated for the upgoing wavefield, using the mean reflectivity. A spatially varying pre-whitening factor is then calculated, using the variance for the reflectivities and the variance for the upgoing wavefield. A reflectivity is calculated at each location, using the spatially varying pre-whitening factor.

    摘要翻译: 通过计算地震数据中每个频率的单个反射率,对叠前地震数据进行成像。 然后,平均反射率是计算个体反射率。 对于反射率与频率的集合计算出方差。 使用平均反射率计算上行波场的第二个方差。 然后使用上述波场的反射率和方差的方差来计算空间变化的预白化因子。 使用空间变化的预白化因子在每个位置计算反射率。

    Method for downward extrapolation of pre-stack seismic data
    2.
    发明授权
    Method for downward extrapolation of pre-stack seismic data 失效
    叠前地震数据向下推算方法

    公开(公告)号:US07039526B2

    公开(公告)日:2006-05-02

    申请号:US10692184

    申请日:2003-10-23

    IPC分类号: G01V1/00

    摘要: A set of pre-stack seismic data is downward extrapolated, by first determining a migration interval in the seismic data set. A maximum error criterion is selected for the migration interval. A maximum relative error in phase calculated as a function of frequency, propagation angle, and the relative variation in velocity in the migration interval. The maximum relative error in phase is compared to the maximum error criterion. The type of extrapolation to use in the migration interval is determined from the comparison of the maximum relative error in phase to the maximum error criterion. The type of extrapolation is selected from a set comprising Gazdag phase-shift extrapolation, split-shift Fourier extrapolation, and implicit finite difference extrapolation.

    摘要翻译: 通过首先确定地震数据集中的迁移间隔,一组叠前地震数据向下推算。 为迁移间隔选择最大错误标准。 相位的最大相对误差作为频率,传播角度以及迁移间隔中速度的相对变化的函数计算。 将最大相位误差与最大误差准则进行比较。 在迁移间隔中使用的外推类型是从相位上的最大相对误差与最大误差准则的比较来确定的。 从包括Gazdag相移外插,分裂傅里叶外推和隐式有限差分外推的集合中选择外推的类型。