波阻抗反演的快速模拟退火算法

Fast simulated annealing algorithm for wave impedance inversion

波阻抗反演是储层参数及砂体预测不可缺少的内容,在地震勘探中占有重要位置.使用快速模拟退火算法(FSA)进行波阻抗反演,能避免目标函数值陷入局部极值区并可获得全局最优解.因此,用快速模拟退火算法进行波阻抗反演,并通过理论模型试算和实际资料的反演验证了该算法的应用效果.结果表明,FSA反演结果不依赖于初值,FSA收敛速度比常规模拟退火算法(SA)收敛速度更快,井点处的波阻抗反演结果与测井数据基本吻合.

Wave impedance inversion is essential in predicting reservoir properties and sand-body distribution, and plays an important role in seismic survey. In consideration of the fact that the fast simulated annealing (FSA) algorithm for wave impedance inversion may prevent the objective function from getting into local extreme ranges, and obtain the global optimum solution, the algorithm was adopted in this study, and the effectiveness of the algorithm was verified by trial calculation of theoretical model and inversion of measured data. The result indicates that the FSA result does not depend on the initial value, that the convergent speed of FSA is higher than that of the conventional simulated annealing (SA) algorithm, and that the FSA result of wave impedance inversion is coincident with well-logging data in boreholes.