Declination Compensation for Seismic Surveys
    5.
    发明公开
    Declination Compensation for Seismic Surveys 有权
    内蒙古自治大学

    公开(公告)号:EP2527880A2

    公开(公告)日:2012-11-28

    申请号:EP12168832.9

    申请日:2012-05-22

    IPC分类号: G01V11/00

    摘要: In seismic survey for icy waters, streamers are towed behind a vessel under the water's surface to avoid ice. GPS readings may not be consistently obtained because the ice prevents a tail buoy with a GPS receiver from trailing from streamer at the surface. Instead, a device tows on the streamer under the water's surface. The streamer's absolute position is tracked by intermittently bringing the towed device toward the surface so GPS readings can be obtained. The streamer's absolute position can then be used in conjunction with compass readings and can correlate various seismic sensor signals obtained along the streamer during the survey. The compass readings can be corrected for declination using declinometer readings, which can be compensated for iron effects from the vessel or other device carrying the declinometer.

    摘要翻译: 在冰冷水域的地震勘测中,拖缆在水面以下的船只后面,以避免冰块。 GPS读数可能无法一致地获得,因为冰防止GPS接收器的尾部浮标从表面的拖缆拖出。 相反,设备在水面下拖着拖缆。 拖缆的绝对位置是通过间歇地将拖曳的装置朝向表面进行跟踪,从而可以获得GPS读数。 拖缆的绝对位置可以与罗盘读数一起使用,并且可以在调查期间将沿拖缆获得的各种地震传感器信号相关联。 罗盘读数可以使用衰减计读数进行偏差校正,这可以从容器或其他携带衰减仪的设备补偿铁的影响。