A direct inversion method for deblending simultaneous-source data

WANG Kunxi1,2,3 MAO Weijian1,2 ZHANG Qingchen1,2 LI Wuqun1,2 ZHAN Yi4 SUN Yunsong4

(1.Center for Computational and Exploration Geophysics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, Hubei Province, China 430077)
(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;

【DOI】

【Funds】 National Key R&D Program of China (2018YFC0310104) Key Project of National Natural Science Foundation of China (U1562216) Project of China National Petroleum Corporation (2016A-33)

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This Article

ISSN:1000-7210

CN: 13-1095/TE

Vol 55, No. 01, Pages 17-28+4-5

February 2020

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Article Outline

Abstract

  • 0 Introduction
  • 1 Methodology
  • 2 Irregular arrangement of geophones and shot points
  • 3 Computed columns
  • 4 Discussion
  • 5 Conclusion
  • References