Method of up-going and down-going wavefield separation in the frequency-wavenumber domain for dual-sensor seismic data
With the advancement of offshore oil and gas exploration and development,the application of dual-sensor ocean bottom receivers(OBC/OBN)is becoming increasingly widespread.As a key technology in dual-sensor data processing,the separation of the up-going and down-going wavefields determines the data processing quality and ap-plication effectiveness.To address the limitations of conventional methods that fail to separate the up-going and down-going wavefields,hydrophone and geophone seismic data are utilized in the frequency-wavenumber domain.By calculating the calibration filter factor for both types of data,with and without direct waves,precise calibration and effective separation of the up-going and down-going wavefields are achieved.The separated up-going wave-field data not only eliminates interference from multiple ghost waves but also improves the signal-to-noise ratio and resolution of seismic data.It thus provides high-fidelity up-going and down-going wavefield data for subsequent joint deconvolution and migration imaging processes.The data examples demonstrate the effectiveness and practical-ity of the proposed method.
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