Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (6): 816-822.doi: 10.11743/ogg20050622

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Depth imaging technique in complex conditions

Fang Wubao1, Sun Jianguo2   

  1. 1. Nanjing Branch of Exploration & Production Research Institute, SINOPEC, Nanjing, Jiangsu;
    2. Exploration & Production Research Institute, SINOPEC, Beijing
  • Received:2005-06-23 Online:2005-12-25 Published:2012-01-16

Abstract:

Wave equation-based prestack depth migration technique can accurately describe the wave field in complex media conditions and perform high resolution imaging.Its key techniques include datum correction through upward and downward continuations of wave field,velocity model modification of imaging points based on common imaging gather in depth domain,and migration anti-alias filter through interpolation of migration data before and after application of imaging condition equation.Practical application shows that prestack depth migration technique based on wave equation is obviously better than conventional techniques in respects of resolution of wave-groups,detail of fault,imaging accuracy of deep target and preservation of amplitude,etc.

Key words: wavefield continuation, datum correction, velocity model, anti-alias filter, depth imaging technique

CLC Number: