A direct inversion method for deblending simultaneous-source data
(2.State Key Laboratory of Geodesy and Earth’s Dynamics, Wuhan, Hubei Province, China 430077)
(3.University of Chinese Academy of Sciences, Beijing, China 100049)
(4.Research & Development Center, BGP, CNPC, Zhuozhou, Hebei Province, China 072751)
【Abstract】In recent years, simultaneous-source acquisition technique has shown a broad application prospect in high-density and wide-azimuth seismic exploration. Based on the limited spatial bandwidth of seismic data, a direct inversion method for deblending simultaneous-source data was discussed in this paper. Different from conventional iterative algorithms with constraints, iteration is not required in this method. A basic point-spread function was added to the pseudo-inverse of time-delay operator, and thus the direct separation of simultaneous-source data without iteration was realized in the frequency domain. By modifying the basic point-spread function, this method was further extended to the separation of simultaneous-source data acquired with irregular receiver and shot arrays geometry. Theoretical model tests demonstrated that the method achieves good separation effect with high accuracy and efficiency when the deblending condition given in the paper is satisfied.
【Keywords】 simultaneous source; direct inversion; irregular array; point-spread matrix; deblending;
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