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    • 1. 发明授权
    • Amplitude and phase compensation in dual-sensor ocean bottom cable
seismic data processing
    • 双传感器海底电缆地震数据处理中的幅度和相位补偿
    • US5774417A
    • 1998-06-30
    • US738026
    • 1996-10-25
    • Dennis CorriganVaughn L. Ball
    • Dennis CorriganVaughn L. Ball
    • G01V1/36G01V1/38G01V1/28
    • G01V1/38G01V1/36G01V2210/32G01V2210/56
    • A method and computer system for applying corrections to dual sensor ocean bottom cable marine seismic signals, for purposes of eliminating ghosts and reverberations, are disclosed. According to the disclosed method and system, both phase and amplitude corrections are derived in common receiver gathers, and applied to each geophone trace in the gather; preferably, the derivation of the corrections is performed on a limited offset common receiver gather. The phase correction is determined by minimizing a folded cross-correlation of the hydrophone and geophone signals over varying phase angles, with the appropriate phase correction corresponding to the angle at which the minimum is obtained; preferably, stacked cross-correlations are used in the phase correction determination to reduce the effects of random noise. The phase correction is then applied to the geophone traces in the gather, and an amplitude correction is derived by minimizing a cross-ghosting relationship. Preferably, the cross-ghosting minimization is based upon stacked cross-correlations of the geophone and hydrophone signals and a stacked hydrophone autocorrelation, to eliminate the effects of coherent noise on the geophone trace and the effects of random noise on both the geophone and hydrophone traces. The amplitude correction is then applied to each of the geophone traces in the gather, and the summation scalar is then derived and used to sum the geophone and hydrophone traces for each source-receiver path. The summation scalar may be selected to compensate not only for ghosts, but also for receiver-side reverberations. The summation scalar may also be derived using an estimate for the seafloor reflectivity that takes into account source-side reverberations.
    • 公开了一种用于对双传感器海底电缆海洋地震信号进行校正的方法和计算机系统,用于消除重影和混响。 根据所公开的方法和系统,相位和振幅校正在公共接收机集合中导出,并应用于集合中的每个地震检波器轨迹; 优选地,校正的推导在有限的偏移公共接收器集合上执行。 相位校正是通过使水听器和地震检波器信号在变化的相位角上的折叠互相关最小化来确定的,适当的相位校正对应于获得最小值的角度; 优选地,在相位校正确定中使用堆叠的互相关来减少随机噪声的影响。 然后将相位校正应用于集合中的地震检波器轨迹,并通过最小化交叉重影关系导出振幅校正。 优选地,交叉重影最小化基于地震检波器和水听器信号的堆叠交叉相关性以及堆叠的水听器自相关,以消除相干噪声对地震检波器轨迹的影响以及随机噪声对地震检波器和水听器迹线的影响 。 然后将幅度校正应用于集合中的每个地震检波器轨迹,然后推导求和标量,并用于对每个源 - 接收器路径的地震检波器和水听器轨迹求和。 可以选择求和标量来补偿不仅对于重影,而且还用于接收机侧混响。 也可以使用考虑到源侧混响的海底反射率的估计来推导求和标量。
    • 3. 发明授权
    • High fidelity vibratory source seismic method with source separation
    • 高保真振动源地震方法与源分离
    • US5721710A
    • 1998-02-24
    • US717176
    • 1996-09-20
    • John J. SallasDennis CorriganKenneth Paul Allen
    • John J. SallasDennis CorriganKenneth Paul Allen
    • G01V1/37G01V1/28
    • G01V1/375G01V2210/127G01V2210/26
    • A method of separating the effects of the earth response on vibratory energy from individual ones of multiple vibrators to geophones, in generating a seismic survey, is disclosed. According to the disclosed method, measurements of the actual vibrations generated at the source are made, in addition to the geophone measurements of the refracted and reflected vibrations, both over a number of frequency sweeps. The source and geophone vibrations are first transformed into frequency domain representations, by way of Discrete Fourier Transforms. An inverse matrix of the recorded frequency-domain source vibrations is then generated for each frequency. When the number of sweeps equals the number of vibrators, the inverse matrix is merely the multiplicative inverse of the source measurements; if the number of sweeps exceeds the number of vibrators, the inverse matrix is the generalized inverse of the original matrix. The inverse matrix for the frequency is applied to the recorded geophone vibrations at that frequency, to derive the transfer function, corresponding to the earth response, for each vibrator-geophone path in the survey. A weighting factor may be used to discount the effects of poorly behaved sweeps, and may be based on the ratio of the maximum and minimum eigenvalues for the inverse matrix. Using these derived transfer functions, an earth reflectivity function may be derived for each vibrator-geophone path by applying a minimum phase filter to the separated vibrator-geophone transfer function over frequency; this filter removes the effects of a ##EQU1## term, and yields the earth reflectivity function for the path.
    • 公开了一种在产生地震勘测中将地球响应对多个振动器中各个振动器的振动能量的影响分离到地震检波器的方法。 根据所公开的方法,除了对多个频率扫描之外的折射和反射振动的地震检波器测量之外,还进行在源处产生的实际振动的测量。 源和地震检波器振动首先通过离散傅里叶变换转换为频域表示。 然后,针对每个频率产生记录的频域源振动的逆矩阵。 当扫描次数等于振动器的数量时,逆矩阵仅仅是源测量的乘法逆; 如果扫描次数超过振动器的数量,则逆矩阵是原始矩阵的广义逆。 用于频率的逆矩阵被应用于在该频率处的记录的地震检波器振动,以导出与测量中的每个振动器 - 地震检波器路径对应的地球响应的传递函数。 可以使用加权因子来折现表现不佳的扫描的影响,并且可以基于逆矩阵的最大和最小特征值的比率。 使用这些导出的传递函数,可以通过对频率上分离的振动器 - 地震检波器传递函数应用最小相位滤波器来为每个振动器 - 地震检波器路径导出地球反射率函数; 该滤波器去除了项的影响,并产生路径的地球反射率函数。
    • 4. 发明授权
    • Method and apparatus for seismic survey including using vertical
gradient estimation to separate downgoing seismic wavefield
    • 地震勘测方法和装置,包括使用垂直梯度估计来分离下行的地震波场
    • US5051961A
    • 1991-09-24
    • US427691
    • 1989-10-26
    • Dennis CorriganArthur B. WegleinDavid D. Thompson
    • Dennis CorriganArthur B. WegleinDavid D. Thompson
    • G01V1/36
    • G01V1/364G01V2210/56
    • A vertical gradient estimation technique is used to separate downgoing seismic ghost wavefields. The upgoing reflected seismic wavefield, allows the ghost wavefield to be attenuated to improve signal-to-noise ratio. The vertical gradient estimation technique is applicable to both marine seismic surveying using towed hydrophones, and to land seismic surveying using buried geophones. The technique allows the vertical signal gradient to be estimated from seismic signals measured at a single depth, and is based on a relationship between the measured seismic signals, and the source signature and the Green's function for the survey media. The technique involves determning (20) the source signature for the seismic source, and determining (21) the Green's function for the survey media. Seismic signals are then measured (22). These data are then processed to estimate (24) the vertical signal gradient as a function of source signature, Green's function and the measured seismic signals. Once the vertical signal gradient is estimated, it can be used in processing the measured seismic signals to separate and attenuate (26) the downgoing ghost component of the measured seismic signals.
    • 使用垂直梯度估计技术来分离下行地震重影波场。 上行反射的地震波场,允许鬼波场衰减,以提高信噪比。 垂直梯度估计技术适用于使用拖曳水听器的海洋地震勘测,以及使用埋地震检波器进行地震勘测。 该技术允许从在单个深度测量的地震信号估计垂直信号梯度,并且基于所测量的地震信号与源特征与测量介质的格林函数之间的关系。 该技术涉及确定(20)震源的源签名,并确定(21)绿色调查媒体的功能。 然后测量地震信号(22)。 然后处理这些数据以估计(24)垂直信号梯度作为源特征,格林函数和测量的地震信号的函数。 一旦估计了垂直信号梯度,它可以用于处理测量的地震信号以分离和衰减(26)测量的地震信号的下行重影分量。
    • 10. 发明授权
    • Method and system for eliminating ghost reflections from ocean bottom
cable seismic survey signals
    • 从海底电缆地震勘测信号中消除鬼影反射的方法和系统
    • US5696734A
    • 1997-12-09
    • US640089
    • 1996-04-30
    • Dennis Corrigan
    • Dennis Corrigan
    • G01V1/36G01V1/38G01V1/24
    • G01V1/3808G01V1/364G01V2210/56
    • A computer system and method for eliminating the effects of ghost reflections from marine seismic survey traces obtained via ocean bottom cables are disclosed. Dual sensors are used in the ocean bottom cables, to obtain both pressure and velocity traces. The disclosed method combines, in a common receiver gather, the corresponding pressure and velocity traces for each source-receiver path using several values of a scalar value that serves as a weighting factor. Conventional corrections and filtering, including spiking deconvolution, are applied to the combined traces, and the combined traces for each value of the scalar are stacked over a limited offset range. Autocorrelation and other spectral techniques may be applied to identify the residuals of the ghost reflections using each of the multiple scalar values; the optimal value may then be selected, for each common receiver gather, as that which has the minimum ghost reflection residuals. The combined traces for each common receiver gather are then used in conventional survey generation.
    • 公开了一种用于消除通过海底电缆获得的海洋地震勘测痕迹的鬼反射影响的计算机系统和方法。 在海底电缆中使用双传感器,以获得压力和速度迹线。 所公开的方法在普通的接收机集合中,使用用作加权因子的标量值的若干值来组合每个源 - 接收机路径的相应压力和速度迹线。 传统的校正和滤波(包括尖峰反褶积)被应用于组合迹线,并且标量的每个值的组合迹线在有限的偏移范围内堆叠。 可以应用自相关和其他光谱技术来使用多个标量值中的每一个来识别鬼影反射的残差; 然后,对于每个公共接收机集合,可以选择最佳值,作为具有最小重影反射残差的最佳值。 然后在常规测量生成中使用每个公共接收器集合的组合轨迹。