Lithologic Reservoirs ›› 2007, Vol. 19 ›› Issue (3): 101-105.doi: 10.3969/j.issn.1673-8926.2007.03.018

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Research and appl ication of amplitude-preserved split-step Fourier prestack depth migration

LV Bin,WANG Yuchao,LI Fei   

  1. Research Institute of Petroleum Exploration & Development-Northwest(NWGI), PetroChina, Lanzhou 730020, China
  • Online:2007-09-15 Published:2007-09-15

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Abstract:

Both the travel-time information and amplitude information are required to be contained in the prestack depth migration imaging results in the lithology analysis. Based on one-way wave equation , split step Fourier prestack depth migration method is fast and steady. It is carried out by phase shift processing in frequency-wave number domain and time shift processing in f requency-space domain according to the idea of velocity field split . The disadvantages of conventional one-way wave equation in amplitude preserved migration restrict the application of this method in lithology imaging. So split-step Fourier amplit ude-preserved migration operator was put forward. It carries out the amplitude-preserved migration with the phase shift amplitude-preserved correction operator in frequency-wave number domain and time shift amplitude-preserved correction operator in f requency-space domain. The comparison of the shot illumination analysis result s and the prestack depth migration imaging results aiming at Marmousi model indicated the validity and effectiveness of this method.

Key words: lithologic traps, continental basins, seismic information, technology application, key factors analysis

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