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    Seismic data processing
    1.
    发明授权
    Seismic data processing 有权

    公开(公告)号：US11099287B2

    公开(公告)日：2021-08-24

    申请号：US15876268

    申请日：2018-01-22

    申请人： PGS Geophysical AS

    发明人： Stian Hegna ,  Gregg E. Parkes

    IPC分类号： G01V1/38 ,  G01V1/00 ,  G01V1/28 ,  G01V1/32 ,  G01V1/36

    摘要： A method for seismic data processing can include obtaining seismic data acquired based upon trigger times and not based upon positions of triggered source elements. The seismic data can include near-continuously recorded seismic data in split records. The split records can be spliced together into a single near-continuous record to produce a trace with seismic data from a single acquired line. The seismic data can be processed by performing a spatial shift for each of a number of time samples to correct for motion of a number of seismic receivers.

    Survey techniques using streamers at different depths
    2.
    发明授权
    Survey techniques using streamers at different depths 有权

    公开(公告)号：US10459100B2

    公开(公告)日：2019-10-29

    申请号：US14074080

    申请日：2013-11-07

    申请人： PGS Geophysical AS

    发明人： Stian Hegna

    IPC分类号： G01V1/38 ,  G01V3/17

    摘要： Techniques are disclosed relating to geophysical surveying and data processing using streamers at different depths. In one embodiment, a method includes obtaining geophysical data that is specific to a geophysical formation and representative of: a particle motion signal recorded using sensors at a first depth, a first pressure signal recorded using sensors towed at the first depth, and a second pressure signal recorded using sensors towed at a second, greater depth. In this embodiment the method includes modifying a low-frequency range of the particle motion signal using particle motion information estimated based on the second pressure signal. The modified particle motion signal may then be used to separate up-going and down-going wavefields. In some embodiments, obtaining geophysical data is performed by towing a first streamer at the first depth and a second streamer at the second depth. In some embodiments, the second streamer does not include particle motion sensors.

    Non-Uniform Towing Patterns in Marine Geophysical Surveys
    4.
    发明申请
    Non-Uniform Towing Patterns in Marine Geophysical Surveys 审中-公开

    公开(公告)号：US20190113645A1

    公开(公告)日：2019-04-18

    申请号：US16154876

    申请日：2018-10-09

    申请人： PGS Geophysical AS

    发明人： Stian Hegna ,  Tilman Kluver ,  Jostein Lima

    IPC分类号： G01V1/38 ,  G01V1/00

    摘要： Techniques are disclosed relating to performing marine surveys with non-uniform spacing of survey elements in a cross-line direction. This may include, for example, performing a survey pass in a multi-pass survey by towing a plurality of sources and sensors in a towing pattern with non-uniform spacing between adjacent ones of the sources. In some embodiments, the non-uniform spacing between adjacent ones of the sources is determined based on a common mid-point (CMP) spacing parameter for the survey pass in the cross-line direction. The spacing parameter may relate, for example, to difference in average CMP spacing for different parts of the survey spread, variance in CMP spacing, and/or width of the survey spread for which a threshold CMP spacing distance is satisfied. In various embodiments, the disclosed techniques may improve survey resolution and/or accuracy and may require a smaller number of survey passes and/or a reduced amount of survey equipment relative to traditional techniques.

    ESTIMATION OF DIRECT ARRIVAL SIGNALS BASED ON PREDICTED DIRECT ARRIVAL SIGNALS AND MEASUREMENTS
    7.
    发明申请
    ESTIMATION OF DIRECT ARRIVAL SIGNALS BASED ON PREDICTED DIRECT ARRIVAL SIGNALS AND MEASUREMENTS 审中-公开

    公开(公告)号：US20170082760A1

    公开(公告)日：2017-03-23

    申请号：US15366957

    申请日：2016-12-01

    申请人： PGS Geophysical AS

    发明人： Stian Hegna

    IPC分类号： G01V1/36 ,  G01V1/38

    CPC分类号： G01V1/36 ,  G01V1/38 ,  G01V1/3808 ,  G01V2210/57

    摘要： Estimation of direct arrival signals based on predicted direct arrival signals and measurements can include obtaining notional source signatures for notional sources that correspond to source elements in a seismic source. A first predicted direct arrival signal at a first location and a second predicted direct arrival signal at a second location can be determined. The first location corresponds to a seismic receiver and the second location does not correspond to a seismic receiver. A transfer function can be determined based on the first predicted direct arrival signal at the first location and the second predicted direct arrival signal at the second location. An estimated direct arrival signal at the second location can be determined based on the transfer function and a measurement by the seismic receiver corresponding to the first location. The estimated direct arrival signal represents what a measured direct arrival signal would be at the second location.

    Time-efficient tests to detect air gun faults
    8.
    发明授权
    Time-efficient tests to detect air gun faults 有权
    检测气枪故障的时间效率测试

    公开(公告)号：US09482766B2

    公开(公告)日：2016-11-01

    申请号：US14076044

    申请日：2013-11-08

    申请人： PGS Geophysical AS

    发明人： Gregg Parkes ,  Stian Hegna ,  Francis Drossaert

    IPC分类号： G01V1/137 ,  G01V1/38 ,  G01V13/00

    CPC分类号： G01V1/137 ,  G01V1/3861 ,  G01V13/00 ,  G01V2200/14

    摘要： Techniques are disclosed relating to testing of seismic air guns, for example via bubble tests. According to some embodiments of these techniques, a firing sequence for testing the air guns may be determined that reduces the amount of interaction between firings. Further, firing time delays may also be determined in order to further reduce the interactions. Accordingly, a test of an array of air guns may be completed relatively quickly.

    摘要翻译： 公开了关于地震气枪测试的技术，例如通过气泡测试。 根据这些技术的一些实施例，可以确定用于测试气枪的击发序列，其减少了发射之间的相互作用的量。 此外，也可以确定点火时间延迟以便进一步减少相互作用。 因此，可以相对较快地完成对气枪阵列的测试。

    METHODS AND SYSTEMS THAT COMBINE WAVEFIELDS ASSOCIATED WITH GENERALIZED SOURCE ACTIVATION TIMES AND NEAR-CONTINUOUSLY RECORDED SEISMIC DATA
    9.
    发明申请
    METHODS AND SYSTEMS THAT COMBINE WAVEFIELDS ASSOCIATED WITH GENERALIZED SOURCE ACTIVATION TIMES AND NEAR-CONTINUOUSLY RECORDED SEISMIC DATA 审中-公开
    与通用激活时间相关联的波形和近似记录的地震数据的方法和系统

    公开(公告)号：US20160047929A1

    公开(公告)日：2016-02-18

    申请号：US14645337

    申请日：2015-03-11

    申请人： PGS Geophysical AS

    发明人： Stian Hegna ,  Gregg Parkes

    IPC分类号： G01V1/36 ,  G01V1/38 ,  G01V1/30

    CPC分类号： G01V1/36 ,  G01V1/30 ,  G01V1/364 ,  G01V1/38 ,  G01V2210/56 ,  G01V2210/60

    摘要： Systems and methods to correct source responses and perform source deghosting of a pressure or particle motion wavefield recorded using near-continuous recording of seismic data along a vessel track with generalize source activation times. The methods and systems receive a near-continuously recorded seismic data and generate a near-continuous wavefield for approximately stationary-receiver locations. Time windows of different temporal lengths are applied to traces of the near-continuous wavefield in approximately stationary-receiver locations in order to compute common-receiver gathers. The common-receiver gathers are corrected source wavefield response and source ghost effects and are combined in weighted sums to generate broadband seismic data.

    摘要翻译： 使用广义的源激活时间，沿着容器轨道近地连续地记录地震数据记录的压力或粒子运动波场来校正源反应并执行源消偏的系统和方法。 这些方法和系统接收到连续记录的地震数据，并为大致静止 - 接收器位置产生近乎连续的波场。 不同时间长度的时间窗口被应用于近似平稳接收机位置中的近连续波场的轨迹，以便计算公共接收机集合。 公共接收机收集是校正源波场响应和源幽灵效应，并以加权和组合生成宽带地震数据。