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AVO(振幅随入射角变化)反演是一个非线性的组合最优化过程,运用弹性介质模型参数正演生成合成记录,以拟合观测数据。对于没有井资料的地区,结合勘探区域的地质情况对地震数据进行反演,最终得到勘探区域岩石物性参数。采用模拟退火算法进行AVO无井约束反演,对理论模型进行了试算,证明了模拟退火算法在AVO无井约束反演中的可行性。在模拟退火过程中,控制参数选择是重要的一步,要针对所要处理数据进行试验来确定这些参数的合理范围,如果参数选择不当,容易陷入局部极值,得到不理想的结果。
AVO (amplitude variation with angle of incidence) inversion is a nonlinear combinatorial optimization process. Synthetic records are generated forwardly using elastic media model parameters to fit the observed data. For areas without well data, the seismic data are retrieved according to the geology of the exploration area, and finally the petrophysical parameters of the exploration area are obtained. The simulated annealing algorithm was used to conduct the inversion of AVO without wells, and the theoretical model was tested. The feasibility of the simulated annealing algorithm in the inversion of AVO without wells was proved. In the simulated annealing process, the choice of control parameters is an important step to be tested for the data to be processed to determine the reasonable range of these parameters, if the parameters are not properly selected, easy to fall into the local extremes, get unsatisfactory results.