小波多尺度分析在重磁勘探位场解释中的应用

Application of multi-scale wavelet analysis in gravity data interpretation

在重磁勘探数据处理解释中,确定异常体源的深度至关重要.本文基于小波变换在重磁位场分析中的应用,通过正演模拟计算的方法,找到了小波变换细节所反映的深度与该细节分解尺度之间的关系,即小波各阶细节的分解尺度可以反映异常体源的深度.这一发现可以替代以往应用频谱分析来近似确定深度的方法,为重磁反演提供了定量反演深度的依据.将该方法应用于红旗岭铜镍矿的深部找矿实例,证明了该方法的有效性.

The determination of the abnormal sources depth is the very important in the processing and interpretation of gravity and magnetic data. Based on the wavelet transform in the gravity and magnetic field analysis,we find through the forward simulation the relationship between the depth reflected by the wavelet details and the decomposition scales. The order details of wavelet transform scale reflect the depth of abnormal sources. This provides the means to determine the abnormal depth of gravity and magnetic inversions that is more convenient and accurate than the traditional spectrum analysis. Application of method to Hongqiling Cu-Ni Sulfide Deposit proves the effectiveness of the proposed method.