J4 ›› 2010, Vol. 40 ›› Issue (5): 1199-1204.

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Inversion of Array Laterolog by Improved Difference Evolution

LI Zhi-qiang1,2, FAN Yi-ren1, DENG Shao-gui1, |JI Xiu-feng2, LI Hu1   

  1. 1.Faculty of Geo-Resource and Information,China University of Petroleum, Dongying,Shandong 257061|China;
    2.China Research Institute of Radiowave Propagation,Xinxiang,Henan 453003|China
  • Received:2010-01-12 Online:2010-09-26 Published:2010-09-26

Abstract:

According to the problem of array laterolog inversion being affected by the given initial value, a new algorithm based on improved difference evolution inversion is proposed. The inversion of array laterolog response is transformed into an unconstrained nonlinear global optimization problem. Compared with improved differential evolution algorithm and differential evolution algorithm in 30 times randomly calculation, the results show that the searching optimization success rate of the improved algorithm reach to 93.3%, while the average evolutional generation decrease to 1/8 of the original, and the optimum fitness is also only half of the difference evolution inversion method. The inversion results for array laterolog model show that the improved difference evolution algorithm can meet the needs of electric logging inversion. This method is more independent of the initial value than the traditional optimal algorithm.

Key words: improved difference evolution algorithm, array laterolog, inversion, robustness

CLC Number: 

  • P631.811
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