模拟退火法计算大定源瞬变电磁法的视电阻率  

Calculation of apparent resistivity in large fixed loop TEM by simulated annealing algorithm

作　　者：李建慧[1] 朱自强[1] 刘树才[2] 曾思红[1] 赵云威[1] 

机构地区：[1]中南大学信息物理工程学院,湖南长沙410083 [2]中国矿业大学(徐州)资源与地球科学学院,江苏徐州221116

出　　处：《石油地球物理勘探》2011年第1期138-142,164+175,共5页Oil Geophysical Prospecting

基　　金：国家重点基础研究发展计划(973)项目(2007CB209400)

摘　　要：利用模拟退火法拟合理论感应电动势和实测感应电动势,可获得大定源瞬变电磁法矩形发射回线内测点的视电阻率,本文采用均匀半空间和三层地电模型验证了算法的精度和稳定性。以均匀半空间地电模型验证时,采用不同初始模型运行该算法20次,得到的视电阻率大部分与真实电阻率误差在0.5%以内,部分误差在1.5%~6.0%之间,这些误差较大的时刻随机分布。每次迭代计算约40次即可获得高精度的视电阻率值。以三层地电模型验证时,通过与翁爱华利用二分法计算的视电阻率比较,进一步验证了本文算法的正确性。The apparent resistivity of measured point inside rectangular transmitting loop in large fixed loop TEM can be calculated by using simulated annealing algorithm to fit theoretical induction electromotive force and measured induction electromotive force.The precision and stability of algorithm is verified by using the homogeneous half-space and 3-layerd geoelectric models in the paper.The algorithm is run for twenty times with different initial model in verification using homogeneous half space geoelectric model.The calculated results showed the most errors between apparent resistivity and true resistivity are within 0.5% and part errors which meet the random distribution are between 1.5~6.0%.It only requires about forty times of calculation in each iteration procedure,and then the high precision apparent resistivity can be obtained.When using 3-layered geoelectric model in verification,the comparison with Weng Ai-hua's apparent resistivity calculated using dichotomy further proved the correctness of the algorithm presented in this paper.

关 键 词：模拟退火法 大定源瞬变电磁法 矩形回线 视电阻率 

分 类 号：P631[天文地球—地质矿产勘探]