时间域电磁勘探数据的模拟退火法反演研究

A Simulated Annealing Method for Time-domain Electromagnetic Survey Data Inversion

地电模型的高度非线性和非惟一性限制了模拟退火法反演在电磁勘探领域中的应用。该文采用改进的模拟退火算法,实现了时间域电磁法数据的模拟退火法反演。首先通过双重数字滤波方法简化了正演计算过程,然后将非线性反演问题转化为最优化问题,采用模拟退火算法搜索全局最优解。改进的搜索策略能自适应地调整搜索步长,提高了最优解的搜索效率。与传统反演方法进行对比实验,结果表明该方法能有效获得全局最优解,得到更加准确的地电模型参数。

The highly nonlinearity and non-uniqueness of the geoelectric model constrain the application of simulated annealing method in the Time-domain Electro Magnetic（TEM） explorations. A simulating annealing inversion method is presented to get the geoelectric model from the data of the TEM method. Firstly, by the dual digital filtering method, the fast and accurate forward problem is settled. Furthermore, the inversion is converted into an optimization issue and the simulating annealing inversion method is applied to the search for the global optimal solution, of which the search step can be adjusted adaptively, hence improving the searching effeciency. The comparison results with conventional inversion methods show that the proposed method can achieve the global optimal solution and a more accurate result of the geoelectric model.