Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (6): 97-101.doi: 10.3969/j.issn.1673-8926.2011.06.018

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Prediction of Sulige gas reservoir with multi-wave pre-stack inversion based on dual γ models

ZHAO Wanjin， ZHANG Qiaofeng， ZHANG Jianxin， LI Hailiang， SUN Hui   

  1. Research Institute of Petroleum Exploration & Development-Northwest， PetroChina， Lanzhou 730020， China
  • Online:2011-12-20 Published:2011-12-20

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Abstract:

The He 8 member of Shihezi Formation in Sulige Gas Field of Ordos Basin mainly developed fluvial facies reservoir which is characterized by strong heterogeneity and vertically superimposed sand bodies with fast lateral variation. So, conventional inversion can not be used to distinguish the tight sand fromgas-bearing sandstone effectively. The pre-stack multi-wave inversion based on dual γ model and simulated annealing was applied to carry out the reservoir prediction. The method makes use of time-travel and amplitude energy to calculate each ratio（γ） of P-wave velocity and S-wave velocity, and then estimate the best γ by simulated annealing, making the P-wave and S-wave match the best, finally, carry out the P-wave and S-wave velocity inversion with P-wave intercept, gradient and S-wave gradient. Simulate annealing method, which uses interval quartation to determine critical temperature, can be used to obtain global optimumvalue for object function accurately and steadily. The actual data inversion result proves the validity and applicability of this method.

Key words: sedimentary facies, carbonate rocks, diagenesis, reservoir, Oxfordian, Agayry area, Amu Darya Basin

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