改进的位场相关成像方法  

Improved Potential Field Correlation Imaging Method

作　　者：马国庆[1] 杜晓娟[1] 李丽丽[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,吉林长春130026

出　　处：《地球科学（中国地质大学学报）》2013年第5期1121-1127,共7页Earth Science-Journal of China University of Geosciences

基　　金：深部探测技术与实验研究专项SinoProbe-09-01(No.201011078)

摘　　要：位场相关成像是根据实测异常与地下不同位置地质体所产生异常之间的相关系数来快速获得地质体的空间位置.现有的相关成像方法是利用球体模型来模拟地下地质体的形状,当场源体的实际形状与球体相差较大时,计算结果势必出现较大误差.为了解决这一问题,对该方法进行改进,以不同模型来模拟地下地质体形状,计算其产生异常与实测数据的相关系数,理论上使相关系数取得最大值的模型与实际地质体情况一致.因此,改进后的方法不仅可以获得地质体的位置参数,还可以对地质体的类型(构造指数)进行估计.磁异常的相关成像计算采用异常的解析信号来完成,这样可有效地避免磁化方向的干扰,且计算公式相对简单.通过理论模型试验,证明此方法可以成功地完成位场数据的反演工作,且稳定性较高.最后将其应用于上海实测磁异常数据的解释中,获得了地下未爆炸物的分布情况.Potential correlation imaging method uses the correlation coefficient of the anomaly generated by the different location of geologic bodies and the observed data to rapidly obtain the location of the causative sources.The existing correlation imaging methods only use the sphere to simulate the shape of the geologic bodies,when the real shape of the source is different from sphere,and the inversion results suffer large errors.To solve this problem,we present improved correlation imaging method,which computes the correlation coefficients of the observed anomaly and the anomalies generated by different types of the model,respectively,and the larger one of the maxima of the correlation coefficients calculated by different models corresponds to the true model.The improved method can both obtain the depth and the nature（structural index）of the source.We use the analytic signal to compute the correlation coefficient of magnetic anomaly,which can avoid the interference of magnetization direction,and the calculation equation is simpler.We try the method on synthetic potential field data,and the inversion results indicate that the method can successfully finish the inversion of potential field data,and produce more stable results.We have also applied it to measured magnetic data,and we obtain the distribution of the unexploited body.

关 键 词：地质模型 位场 相关成像 类型 解析信号 数据处理 

分 类 号：P31[天文地球—固体地球物理学]