中文摘要：

位场快速反演算法-位场视延拓成像法是利用向下延拓因子的泰勒级数展开代替理论向下延拓来进行近似延拓,然后再将近似延拓场向上延拓到某一深度上,最后将该深度上延拓场再次利用泰勒级数展开进行近似向下延拓实现的。该方法可以在无任何地质约束情况下快速有效地完成场源成像工作。滤波特性表明该方法属于中低通滤波,对高频干扰具有较强的压制能力。模型试验表明泰勒级数展开项数越少,成像异常的分辨率越高;且位场梯度数据的成像准确度更高;二维及三维实例应用表明视延拓成像方法可有效地反映出地质体的空间赋存状态,具有良好的纵向和横向分辨能力。

英文摘要：

This paper presents a fast inversion method called apparent continuation imaging method in potentialfield. This method can make imaging of field source without any priori geological information,and can be achieved by three steps. The first step is using Taylor series expansion of downward continuation operator to obtain approximate continuation field; The second step is taking the approximate continuation field above to be upward continuation of a certain depth; The last step is once again using Taylor series expansion of downward continuation operator to be downward continuation from the certain depth to the given depth. Filtering characteristic shows that the method presented by this paper is low-middle pass filtering and can reduce the high-frequency interference.The single model test indicates that field imaging resolution is higher when the number of Taylor series terms is smaller,and combined model including random noise shows that the accuracy of inverted result using gradient data is higher. Two and three real applications show that apparent continuation imaging method can reflect the spatial extension states of geological bodies with high resolution.