Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (2): 611-629.doi: 10.13278/j.cnki.jjuese.201502303

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Seismic Multiple Model Analysis and Processing Skills in the Deepwater Area of Southern South China Sea

Jia Liankai1,2, Wu Shiguo2, Dong Dongdong2, Luan Yi2   

  1. 1. Research Institude of Shenzhen Branch, CNOOC Limited, Guangzhou 510240, China;
    2. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, Shandong, China
  • Received:2014-04-11 Published:2015-03-26

Abstract:

Due to the complicated structure and rugged seafloor of the continental margin of the southern South China Sea, a plenty of multiples coupled with diffractions are well existed in the multichannel seismic data. To recognize effective signal from the deep and suppress multiples, firstly, we analyzed the multiple propagation law by means of forward modelling; secondly, in particular, we processed the complicated Pluto model and tested several typical multiple elimination techniques. And finally we achieved the effective processing idea: reduce the multiple energy level by Surface Related Multiple Elimination(SRME), suppress the periodic and near offset multiple by deconvolution in τ-p domain; and further suppress the far offset multiples by the Radon transform in the common reflection point(CRP)gather. The results of the theoretical model and Liyue basin seismic data demonstrate that the multiples can be suppressed to a great extent and the effective signal from the deep can be enhanced by this method.

Key words: deepwater multiple, surface related multiple elimination (SRME), deconvolution, CRP gather, Radon transform, Liyue basin, South China Sea

CLC Number: 

  • P631.4

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