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    SEISMIC DETECTION USING 4-SENSORS
    1.
    发明申请
    SEISMIC DETECTION USING 4-SENSORS 审中-公开
    使用4传感器的地震检测

    公开(公告)号：WO02068996A8

    公开(公告)日：2003-10-16

    申请号：PCT/GB0200714

    申请日：2002-02-19

    Applicant: ABB OFFSHORE SYSTEMS LTD

    Inventor： JONES ROBERT HUGHES

    IPC: G01V1/16

    CPC classification number: G01V1/16

    Abstract: A method of using a seismic detector including four seismic sensors having axes which are in a substantially tetrahedral configuration, each of the sensors being in a respective signal channel, includes one or more of the following steps: combining outputs from the sensors to check that their polarities are correct; testing to ascertain in one of the sensors is not working and, if so, using the outputs from the other three sensors to obtain an indication of motion in three dimensions; if all fours sensors are working, using their outputs to obtain an indication of motion in three dimensions on a least squares basis; checking that the outputs from the sensors are coherent; and checking the gains (or sensitivities) of the four channels.

    Abstract translation: 一种使用包括四个地震传感器的地震检测器的方法，所述地震传感器具有基本四面体结构的轴，每个传感器处于相应的信号通道中，包括以下步骤中的一个或多个：组合来自传感器的输出，以检查它们 极性是正确的 在其中一个传感器中进行测试不能正常工作，如果是这样，则使用其他三个传感器的输出来获得三维运动的指示; 如果所有四个传感器都在工作，则使用其输出在最小平方的基础上获得三维运动指示; 检查传感器的输出是否相干; 并检查四个通道的增益（或灵敏度）。

    MONITORING A MICROSEISMIC EVENT
    2.
    发明专利
    MONITORING A MICROSEISMIC EVENT 未知

    公开(公告)号：CA2445703C

    公开(公告)日：2010-05-25

    申请号：CA2445703

    申请日：2003-10-20

    Applicant: ABB OFFSHORE SYSTEMS LTD

    Inventor： JONES ROBERT HUGHES

    IPC: G01V1/30 ,  E21B47/12 ,  G01V1/00 ,  G01V1/36 ,  G01V1/40

    Abstract: A method of monitoring a microseismic event comprises detecting the event to produce a first signal dependent on the event, the first signal including noise at a frequency off Hz (e.g. 50 Hz); taking a first sample of the first signal; taking a second sample of the first signal, the second sample occurring n/f seconds after the first sample, where n is an integer (e.g. 1); and subtracting the first and second samples from each other to produce a further signal dependent on the event in which the noise has been at least partly compensated for.

    Method of reducing noise in a microseismic survey
    5.
    发明专利
    Method of reducing noise in a microseismic survey 未知

    公开(公告)号：GB2394548A

    公开(公告)日：2004-04-28

    申请号：GB0224439

    申请日：2002-10-21

    Applicant: ABB OFFSHORE SYSTEMS LTD

    Inventor： JONES ROBERT HUGHES

    IPC: G01V1/00 ,  G01V1/36

    Abstract: A method of monitoring a microseismic event comprises detecting the event to produce a first signal dependent on the event, the first signal including noise at a frequency of f Hz, e.g. 50 Hz; taking a first sample of the first signal; taking a second sample of the first signal, the second sample occurring n/f seconds after the first sample, where n is an integer, e.g. 1; and subtracting the first and second samples from each other to produce a further signal dependent on the event in which the noise has been at least partly compensated for. The method is designed for reducing the effects of electrical noise in microseismic surveying such as the noise caused by the use of electrical currents used for cathodic protection in borehole surveys.

    Estimating the time of arrival of a seismic wave
    9.
    发明专利
    Estimating the time of arrival of a seismic wave 未知

    公开(公告)号：GB2398124A

    公开(公告)日：2004-08-11

    申请号：GB0302898

    申请日：2003-02-08

    Applicant: ABB OFFSHORE SYSTEMS LTD

    Inventor： JONES ROBERT HUGHES

    IPC: G01V1/00 ,  G01V1/28 ,  G01V1/30

    Abstract: Data processing means are described for calculating an estimated time of arrival of a seismic or microseismic P or S wave at a sensor station, based on a P to S wave velocity ratio, a calculated estimated time of origin of the event and, where the estimated arrival time of a P wave is to be calculated, a picked arrival time of the S wave at the sensor station or, where the estimated arrival time of a S wave is to be calculated, a picked arrival time of the P wave at the sensor station.

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