Research on Array Lateral Logging Real-Time Inversions Based on Hybrid Simulated Annealing Algorithms

The real-time inversion of logging data is the basis for judging the field logging quality on-site and the subsequent detailed evaluations. By using the simulated annealing algorithm and Marquette algorithm, the hybrid inversion of three parameters (formation resistivity, radius of flushing zone and flushing zone resistivity) was carried out with the array lateral logging data, so as to further improve the inversion accuracy while ensuring the inversion speed of the conventional real-time inversion methods. The research showed that the selection of initial value had a clear effect on the results of hybrid inversion. A strategy for selecting the initial value of the radius of flushing zone can avoid the inversion result falling into the local minimum based on the resistivity amplitude difference. Further, it can speed up the inversion. The example application results indicated that the inversion speed of hybrid inversion algorithm could meet the real-time inversion requirements. The research also found that the inversion accuracy was higher than that of the traditional Marquette algorithm significantly. Remarkably, the inversion results were consistent with the test results, which verified the applicability of hybrid inversion algorithm. The hybrid simulated annealing algorithm has provided new idea and technical support for the inversion processing of field array lateral logging data.