Application of seismic fusion processing about flat cable and inclined cable in Pearl River Mouth Basin
With the advancement of offshore oil and gas exploration,the exploration target strata has gradually expanded to the deeper part in recent years.It has become an urgent need for seismic technology in oil and gas ex-ploration and development at this stage to improve the seismic imaging about signal-to-noise ratio and resolution of deep layers and complex structural zones.The conventional offshore streamer(flat cable)data is affected by the sea surface virtual reflection(ghost wave),which narrows the frequency of seismic records and reduces the resolution of seismic data.Inclined cable acquisition uses the variation characteristics of ghost wave notch fre-quency points with cable depth to better suppress ghost waves and broaden low frequency through deconvolu-tion operator,but the attenuation of medium and deep seismic high frequency data is serious,which is not con-ducive to the description of structural details.Due to the differences in phase,frequency and energy between the two different acquisition methods,the seismic data obtained by the conventional fusion process has poor continuity of in-phase axes in the middle and deep layers,and even false faults.In order to obtained more fidelity and high signal-to-noise ratio imaging results,we need to integrate the advantages of inclined cable low-frequency and flat cable high-frequency data,In this study,the author proposes a phased multi-dimensional indined and flat cable matching and fusion processing method,which establishes multi-dimensional matching factors through multi-angle analyses such as RMS amplitude,phase,frequency,etc.,to solve the problem of poor continuity of the seismic event in conventional fusion processing.The final fusion result has both advantages,greatly improves the imaging accuracy of medium and deep layers,and can be widely used in seismic data processing of marine exploration and development.
medium and deep layersstreamer acquisitioninclined cable acquisitionfusion processingghost wave suppression
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