【摘要】 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。更多还原

【Abstract】 AVO(Amplitude Variation with Offset) inversion is a nonlinear optimization algorithm to find global optimum of an objective function.Synthetic reflection coefficient can be obtained from estimated lithologic parameters,thus to reconstruct the recorded seismic data.If there is no borehole data,the lithologic parameters can be obtained by AVO inversion with the geological information.Therefore,the spatial distributions of lithologic parameters will be estimated.In this paper,Simulated Annealing is used in AVO inversion,and the result of trial calculation based on the theory model is reasonable.The selection of control parameter is significant in Simulating Annealing.The range of the control parameter must be determined by trail aiming at the data that should be estimated.Improper selection of parameters may lead to the inaccuracy of estimated spatial distributions of lithologic properties.更多还原