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    METHOD AND APPARATUS FOR DYNAMIC ROLL COMPENSATION OF STREAMER FOR MARINE GEOPHYSICAL SURVEYING
    11.
    发明公开
    METHOD AND APPARATUS FOR DYNAMIC ROLL COMPENSATION OF STREAMER FOR MARINE GEOPHYSICAL SURVEYING 审中-公开

    公开(公告)号：EP4145184A1

    公开(公告)日：2023-03-08

    申请号：EP22195899.4

    申请日：2017-12-12

    申请人： PGS Geophysical AS

    发明人： SUDOW, Gustav Goran Mattias

    IPC分类号： G01V1/20 ,  G01C21/16 ,  G01V1/38 ,  G01V3/165 ,  G01V11/00 ,  G01V1/16 ,  G01V1/18 ,  G01V1/36

    摘要： Included are methods and apparatus for marine geophysical surveying. One embodiment of the presently-disclosed solution relates to a method for instantaneous roll compensation of vectorised motion data originating from a fixed-mount geophysical sensor during a marine seismic survey. A streamer is towed behind a survey vessel in a body of water. The streamer includes a plurality of geophysical sensors and a plurality of orientation sensor packages. Vectorised geophysical data is acquired using the plurality of geophysical sensors, while orientation data is acquired by the plurality of orientation sensor packages. The orientation data is used to determine an instantaneous roll angle of the streamer at different positions on the streamer. The vectorised geophysical data is adjusted to compensate for the instantaneous roll angle of the streamer at different positions on the streamer. Other embodiments and features are also disclosed.

    METHOD AND APPARATUS FOR REMOVING TUBE WAVE INTERFERENCE FROM OPTICAL FIBER ACOUSTIC WAVE SENSING SEISMIC DATA
    15.
    发明公开
    METHOD AND APPARATUS FOR REMOVING TUBE WAVE INTERFERENCE FROM OPTICAL FIBER ACOUSTIC WAVE SENSING SEISMIC DATA 审中-公开

    公开(公告)号：EP4102260A1

    公开(公告)日：2022-12-14

    申请号：EP21749991.2

    申请日：2021-01-28

    申请人： China National Petroleum Corporation ,  BGP Inc., China National Petroleum Corporation

    发明人： LI, Yanpeng ,  LI, Fei

    IPC分类号： G01V1/48 ,  G01V1/36

    摘要： A method for removing tube wave interference from optical fiber acoustic wave sensing seismic data, including: acquiring seismic wavefield data which contains a tube wave interference and is collected by an optical fiber acoustic wave sensing instrument; downwardly cutting waveform data with a preset time window length on each seismic trace along travel time of the tube wave, and calculating a root-mean-square amplitude of the waveform data cut on the seismic trace as an amplitude normalization factor of the seismic trace; performing normalization processing on the amplitude value of each seismic trace at each sampling time point; performing de-tail mean filtering processing on the normalized amplitude value of each seismic trace at each sampling time point along the travel time of the tube wave, to obtain a predicted amplitude value of the tube wave at the sampling time point; on this basis, performing tube wave interference removal processing on each seismic trace at each sampling time point, and finally performing inverse normalization processing to obtain the seismic wavefield data without tube wave interference. The method effectively suppresses the tube wave interference in the optical fiber acoustic wave sensing seismic data. An apparatus for removing tube wave interference from optical fiber acoustic wave sensing seismic data, a computer device, and a computer-readable storage medium are further provided.