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    NOISE REMOVAL FOR DISTRIBUTED ACOUSTIC SENSING DATA
    1.
    发明公开
    NOISE REMOVAL FOR DISTRIBUTED ACOUSTIC SENSING DATA 审中-公开
    分布式声学传感数据的噪声消除

    公开(公告)号：EP3164742A1

    公开(公告)日：2017-05-10

    申请号：EP15839428.8

    申请日：2015-08-13

    申请人： Halliburton Energy Services, Inc.

    发明人： ELLMAUTHALER, Andreas ,  WILLIS, Mark, Elliott ,  BARFOOT, David, Andrew ,  WALKER, Kristoffer, Thomas

    IPC分类号： G01V1/40 ,  G01V1/46 ,  E21B47/00

    CPC分类号： G01V1/42 ,  G01H9/004 ,  G01V1/226 ,  G01V2200/14 ,  G01V2210/161 ,  G01V2210/20 ,  G01V2210/30

    摘要： An example method includes at least partially positioning within a wellbore an optical fiber of a distributed acoustic sensing (DAS) data collection system. Seismic data from the DAS data collection system may be received. The seismic data may include seismic traces associated with a plurality of depths in the wellbore. A quality factor may be determined for each seismic trace. One or more seismic traces may be removed from the seismic data based, at least in part, on the determined quality factors.

    摘要翻译： 示例方法包括至少部分地在井眼内定位分布式声学感测（DAS）数据收集系统的光纤。 可以接收来自DAS数据收集系统的地震数据。 地震数据可以包括与井眼中的多个深度相关联的地震痕迹。 可以为每个地震道确定品质因数。 至少部分地基于所确定的质量因素，可以从地震数据中去除一个或多个地震道。

    Method for improving signal to noise ratio
    2.
    发明公开
    Method for improving signal to noise ratio 失效
    Verfahren zur Signal-Rauschverhältnisverbesserung。

    公开(公告)号：EP0602703A2

    公开(公告)日：1994-06-22

    申请号：EP93203368.1

    申请日：1993-12-01

    申请人： SERVICES PETROLIERS SCHLUMBERGER ,  SCHLUMBERGER TECHNOLOGY B.V. ,  SCHLUMBERGER HOLDINGS LIMITED ,  Schlumberger Limited

    发明人： Meehan, Richard John

    IPC分类号： G01V1/36

    CPC分类号： G01V1/364 ,  G01V1/36 ,  G01V2210/30 ,  G01V2210/32 ,  G01V2210/34

    摘要： A method for improving the signal to noise ratio from a pair of detectors such as geophones which each detect a noisy signal comprising a signal of interest ( S ) and a noise signal ( N ), wherein the signal of interest ( S ) has a different moveout across the pair of detectors from that of the noise signal ( N ), and the noise signal ( N ) from a given source is detected at the first detector at a time Δ t before the corresponding noise signal is detected at the second detector, the method comprising delaying the noisy signal ( S + N ) detected at the first detector by an amount τ being greater than the moveout of the signal of interest but not more than Δ t and subtracting the delayed signal from that detected at the second detector by means of an adaptive filter so as to minimise the power in the resultant signal The signal detected at the first detection and optionally the resultant signal can also be delayed by an amount τ₂ and the signal detected at the second detector is subtracted from the delayed first detector (and resultant signals) by means of an adaptive fitler so as to minimise the power in the final signal, the delay τ₂ being greater than the moveout of the signal of interest plus the length of the filter but not more than Δ t plus the length of the filter.

    摘要翻译： 一种用于从诸如地震检波器的一对检测器改善信噪比的方法，每个检测器检测包括感兴趣信号（S）和噪声信号（N）的噪声信号，其中感兴趣的信号（S）具有不同的信号 在噪声信号（N）的检测器之外移动一对检测器，并且在第二检测器检测到对应的噪声信号之前的时间DELTA t，在第一检测器处检测来自给定源的噪声信号（N） 所述方法包括将在第一检测器处检测到的噪声信号（S + N）延迟大于感兴趣信号的移动但不大于DELTA的量T，并且从第二检测器检测到的延迟信号减去第二检测器检测到的延迟信号 自适应滤波器的装置，以便最小化所得信号中的功率。在第一次检测时检测到的信号和可选的结果信号也可以被延迟量τ2，并且在第二检测器处检测到的信号是次 通过自适应调节器从延迟的第一检测器（和结果信号）中扣除，以使最终信号中的功率最小化，延迟τ2大于感兴趣的信号的移出加上滤波器的长度，而不是 超过DELTA t加上过滤器的长度。

    REVERSE TIME MIGRATION BACK-SCATTERING NOISE REMOVAL USING DECOMPOSED WAVEFIELD DIRECTIVITY
    10.
    发明公开
    REVERSE TIME MIGRATION BACK-SCATTERING NOISE REMOVAL USING DECOMPOSED WAVEFIELD DIRECTIVITY 审中-公开
    逆时偏移背向噪声去除使用Polar格局分解波场

    公开(公告)号：EP2612172A2

    公开(公告)日：2013-07-10

    申请号：EP11822301.5

    申请日：2011-08-03

    申请人： Chevron U.S.A. Inc.

    发明人： LIU, Wei

    IPC分类号： G01V1/36 ,  G01V1/28 ,  G06F19/00

    CPC分类号： G01V1/28 ,  G01V2210/30 ,  G01V2210/51 ,  G01V2210/67 ,  G01V2210/679

    摘要： Images of a subsurface region may be generated in conjunction with reverse time migration with reduced or no backscattering noise. Two or more wavefields may be decomposed to produce two or more corresponding decomposed wavefields. The two or more decomposed wavefields may include a source wavefield and a receiver wavefield. Directivity of the two or more decomposed wavefields may be determined to produce corresponding direction-dependent components of the two or more decomposed wavefields. One or more of the direction-dependent components of one or more decomposed source wavefields may be cross-correlated with one or more of the direction-dependent components of one or more corresponding decomposed receiver wavefields. An image of the subsurface region may be generated based on the cross-correlation.