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41.发明公开METHOD FOR THE DETERMINATION OF LOCAL WAVE HEIGHTS AND ACOUSTIC SENSOR IN MARINE SEISMIC SIGNALS 有权维也纳ZUR BESTIMMUNG DER LOKALENWENENHÖHE在MEUSESSEISMISCHEN SIGNALEN UND AKUSTISCHER SENSOR
公开(公告)号：EP1147435A1
公开(公告)日：2001-10-24
申请号：EP99973497.3
申请日：1999-11-18
IPC分类号： G01V1/38
CPC分类号： G01V1/38 , G01V2210/56
摘要： A method of analysing seismic signals for use in connection with marine seismic data acquisition activities including the steps of: sensing a receiver ghost signal using a submerged acoustic sensor (18); and estimating the height of the water column above the acoustic sensor using said receiver ghost signal (30). The method may further include the steps of: identifying changes in arrival times from seismic signals received by a plurality of submerged acoustic sensors (18) located at different offsets from an acoustic source; determining time differences between the identified changes in arrival times and expected changes in arrival times associated with an assumed acoustic sensor depth profile; and converting the time differences into depth differences between the assumed acoustic sensor depth profile and the actual depth profile of said acoustic sensors. This method provides for improved determination of local wave heights and acoustic sensor elevations and allows 'noise' in seismic data associated with changes in local wave heights and seismic sensor elevations to be attenuated during subsequent data processing.
摘要翻译： 提供了一种用于在海洋地震勘测期间响应于声源的操作来分析从多个地震传感器接收的接收的地震信号的方法。 地震传感器位于与声源不同的偏移处。 该方法包括以下步骤：在特定的地震信号中选择时间窗口，该时间窗口对在信号中表示的相对明确定义的事件进行帧化。 从特定的地震传感器接收特定的地震信号。 该方法还包括从窗口中的地震信号的振幅/频谱确定接收机重影陷波频率，并从接收机重影陷波频率导出产生所述特定地震的特定地震传感器之上的水柱高度的估计 信号。
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公开(公告)号：EP0923745A4
公开(公告)日：2001-09-12
申请号：EP97936177
申请日：1997-07-23
CPC分类号： G01V1/362 , G01V2210/52 , G01V2210/56
摘要： A method for reconstructing (138) a selected wavefield at a designated common midpoint and offset location (132) from a set of prestack seismic data traces (126). The method uses actual data traces from other common midpoint and offset locations to reconstruct the selected wavefield at the designated reconstruction location. The method may be used to reconstruct any selected wavefield, including both primary reflection wavefields and secondary wavefields such as water-bottom multiple wavefields, and may be used with both 2-D and 3-D seismic data. If the reconstructed wavefield is a secondary wavefield, it may be subtracted from the restack seismic data traces to eliminate interference between wavefields. The method may also be used to reconstruct data from missing shots to avoid spatial aliasing problems in other data processing operations.
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公开(公告)号：EP0666992B1
公开(公告)日：1999-08-25
申请号：EP94923411.6
申请日：1994-07-13
CPC分类号： G01V1/3808 , G01P3/42 , G01V1/364 , G01V2210/56
摘要： A method for reducing the effects of reverberation on noisy seismic wavefields recorded from within a moisture-laden environment. The wavefield manifests itself as a pressure signature and a velocity signature that contains an embedded noise signature. The pressure signature is adaptively filtered and subtractively combined with the velocity signature to isolate a nearly pure noise signature. The nearly pure noise signature is added back to the original velocity signature with opposite sign to clear away the embedded noise, leaving a refined velocity signature. The refined velocity signature iteratively is scaled and summed with the pressure signature, incrementing the scale factor at each iteration and autocorrelating the sum. A coefficient of convergence is calculated after each summation. The coefficient of convergence that most closely approaches unity identifies the preferred scale factor.
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公开(公告)号：EP0666992A4
公开(公告)日：1998-04-29
申请号：EP94923411
申请日：1994-07-13
CPC分类号： G01V1/3808 , G01P3/42 , G01V1/364 , G01V2210/56
摘要： A method for reducing the effects of reverberation on noisy seismic wavefields recorded from within a moisture-laden environment. The wavefield manifests itself as a pressure signature and a velocity signature that contains an embedded noise signature. The pressure signature is adaptively filtered and subtractively combined with the velocity signature to isolate a nearly pure noise signature. The nearly pure noise signature is added back to the original velocity signature with opposite sign to clear away the embedded noise, leaving a refined velocity signature. The refined velocity signature iteratively is scaled and summed with the pressure signature, incrementing the scale factor at each iteration and autocorrelating the sum. A coefficient of convergence is calculated after each summation. The coefficient of convergence that most closely approaches unity identifies the preferred scale factor.
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公开(公告)号：EP0534648A1
公开(公告)日：1993-03-31
申请号：EP92308278.8
申请日：1992-09-11
IPC分类号： G01V1/38
CPC分类号： G01V1/3808 , G01V1/16 , G01V1/364 , G01V13/00 , G01V2210/21 , G01V2210/56
摘要： In dual-sensor, bottom-cable (16) marine seismic exploration where hydrophone/geophone pairs (18) are deployed on the marine bottom (20), coupling imperfections between the geophones and the marine bottom contribute to differences between the impulse response of the geophones and the impulse response of the hydrophones. To correct for the coupling imperfection, a filter is designed which compensates for the inherent impulse response differences as well as response differences caused by the imperfect coupling. Preferably, the filter is designed using a calibration procedure prior to production shooting. First, the response of a hydrophone and geophone to a seismic wave is recorded. Then, these recorded responses are transformed into the frequency domain. Once transformed, the response of the hydrophone is divided by the response of the geophone to produce a filtering function. When the filtering function is applied to geophone signals during production shooting, the filter compensates the geophone signals to alleviate differences in response characteristics between the geophone signals and the hydrophone signals.
摘要翻译： 在双传感器，底层电缆（16）海洋地震勘探中，水中听音器/地震检波器对（18）部署在海底（20）上，耦合在地震检波器与海底之间的缺陷有助于脉冲响应 地震检波器和水听器的脉冲响应。 为了校正耦合缺陷，设计了一种滤波器来补偿固有的脉冲响应差异以及由不完美耦合引起的响应差异。 优选地，在生产拍摄之前使用校准程序设计过滤器。 首先，记录了水听器和地震检波器对地震波的响应。 然后，这些记录的响应被转换成频域。 一旦变换，水听器的响应被地震检波器的响应除以产生滤波功能。 当在制作拍摄期间将滤波功能应用于地震检波器信号时，滤波器补偿地震检波器信号，以减轻地震检波器信号与水听器信号之间的响应特性差异。
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公开(公告)号：EP0365270A2
公开(公告)日：1990-04-25
申请号：EP89310638.5
申请日：1989-10-17
CPC分类号： G01V1/362 , G01V1/3808 , G01V2210/56
摘要： Marine seismic data is gathered using a cable (16) towed behind a vessel (10) having a slanted orientation in the water. The recorded data is processed to remove the time offset in the recorded data of seismic signals arriving at the cable (16) at varying plane wave angles. The recorded data is then processed to align the primary signals, thereby misaligning the ghost signals. The data is also processed to align the ghost signals, thereby misaligning the primary signals. The two resulting data sets may then be summed.
摘要翻译： 海洋地震数据采用在水中具有倾斜取向的船（10）后面拖曳的缆索（16）来收集。 对记录的数据进行处理，以消除以变化的平面波角到达电缆（16）的地震信号的记录数据中的时间偏移。 然后处理记录的数据以对齐主信号，从而使重影信号失准。 数据也被处理以对齐重影信号，从而使主要信号失准。 然后可以对两个结果数据集进行求和。
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公开(公告)号：EP0089700A2
公开(公告)日：1983-09-28
申请号：EP83200253.9
申请日：1983-02-18
发明人： Berni, Albert Joseph
CPC分类号： G01V1/3808 , G01V1/364 , G01V2210/56
摘要： A method and system for producing a seismic signal indicative of the substrata beneath a body of water comprising the steps of: supplying acoustic energy to the body of water; sensing both the pressure waves and the motion of the water particles accompanying pressure waves reflected from the substrata below the water and from the surface of the water; normalizing the amplitudes of the pressure wave and particle motion signals; modifying the phase shifts of these pressure wave and particle motion signals so that each of the phase shifts of such signals, other than phase shifts caused by the time at which the pressure waves and particle motions are sensed is zero; modifying the amplitude of each frequency component of the normalized, zero-phased signals as a function of the signal-to-noise ratios related to the pressure wave and particle motion sensing steps; and combining these modified signals to reduce or eliminate the effect of the surface reflection on the recorded seismic signal.
摘要翻译： 一种用于产生指示水体下面的基底的地震信号的方法和系统，包括以下步骤：向水体提供声能; 感测压力波和水粒子的运动，伴随着从水面下方的基底和水面反射的压力波; 归一化压力波和粒子运动信号的振幅; 修改这些压力波和粒子运动信号的相移，使得除了由感测压力波和粒子运动的时间引起的相移之外的这些信号的每个相移都为零; 修正归一化的零相位信号的每个频率分量的振幅，作为与压力波和粒子运动感测步骤有关的信噪比的函数; 并组合这些修改的信号以减少或消除表面反射对所记录的地震信号的影响。
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公开(公告)号：EP3391094A1
公开(公告)日：2018-10-24
申请号：EP16876401.7
申请日：2016-12-07
发明人： KOSTOV, Clement , SLATON, Scott A.
CPC分类号： G01V1/282 , G01V1/301 , G01V1/303 , G01V1/36 , G01V1/3808 , G01V2210/1293 , G01V2210/1423 , G01V2210/56 , G01V2210/67
摘要： A method includes receiving a seismic dataset from a survey, wherein the seismic dataset represents a portion of a subsurface geological formation and includes primary and multiple data. The method further includes the steps of conditioning the seismic dataset and estimating a model of the multiple data in the conditioned seismic dataset based on a user-defined parameter to derive a primary data set. Further, the method includes the steps of computing a velocity model from the primary data set using the user-defined parameter and updating the estimated multiple model based at least on a modification of the user-defined parameter. In addition, the method includes the steps of recomputing the primary data and the velocity model based on the modified user-defined parameter and generating an image of the primary data.
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公开(公告)号：EP3304133A1
公开(公告)日：2018-04-11
申请号：EP16712163.1
申请日：2016-03-16
发明人： AKCELIK, Volkan , KREBS, Jerome, R.
CPC分类号： G01V1/282 , G01V1/28 , G01V1/301 , G01V1/306 , G01V1/38 , G01V2210/32 , G01V2210/56 , G01V2210/614
摘要： A method, including: storing, in a computer storage device, geophysical seismic data that has been separated into a multiple-free component and a multiple contaminated component; performing, with a processor, a first full wavefield inversion process on the multiple-free component of the seismic data, wherein a first subsurface physical property model is generated; determining, with a processor, an extended target reflectivity, wherein the extended target reflectivity includes a reflectivity for each of a plurality of shots; separately performing, with a processor, a second full wavefield inversion process with the multiple contaminated component of the seismic data for each of the plurality of shots using the reflectivity corresponding to each of the plurality of shots, wherein a second subsurface physical property model is generated; and generating, with a processor, multiple-free final subsurface physical property model by combining the first subsurface physical property model and the second subsurface physical property model.
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公开(公告)号：EP3120169A4
公开(公告)日：2017-10-25
申请号：EP15765473
申请日：2015-03-19
CPC分类号： G01V1/3861 , G01V1/3808 , G01V2210/1293 , G01V2210/56
摘要： Marine seismic vibrators in a marine seismic vibrator array for use in a seismic survey are activated to produce a source gradient wavefield to survey a target structure. The seismic survey may comprise a marine seismic survey conducted in a body of water.
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