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一个磁异常响应的解释工作包含了确定表征异常源的参数特征。构造顶部的深度一般是所求的一个参数,而场源参数成像(SPI~TM)方法是确定这种深度估算值的一种方法。SPI方法的一个优点是深度结果可以用图像来显示,一般情况下,可以有一个图像代表一个假设的接触带(断层)模型,而另一个图像代表一个假设的倾斜薄层(岩脉)模型,所获得的深度计算结果依赖于所假设的模型。场源参数成像方法的一个改进是将该方法扩展到水平圆柱体模型中并且同时能够自动地确定最合适的模型。这种模型可以显示在一个图像上,而且,也能确定每一个异常的正确深度估算值。因而,这些深度估算值能在一张不依赖于一个假设模型的图上进行求取。合成的和野外数据所产生的图像表明,改进的SPI方法使解释磁测数据的工作更加容易。
The interpretation of a magnetic anomaly response involves determining the characteristics of the parameters that characterize the source of the anomaly. The depth at the top of the structure is generally one of the parameters sought, and the field-source parametric imaging (SPI ~ TM) method is one way to determine this depth estimate. An advantage of the SPI method is that the depth results can be displayed graphically. In general, there can be an image representing a hypothetical contact zone (fault) model and another image representing a hypothetical oblique slice (dyke) model, The depth calculations obtained depend on the model assumed. An improvement of the field source imaging method is to extend the method to a horizontal cylinder model and at the same time automatically determine the most suitable model. This model can be displayed on an image, but it also determines the correct depth estimate for each anomaly. Therefore, these depth estimates can be calculated on a graph independent of a hypothetical model. The resulting images from the combined and field data suggest that the improved SPI method makes the task of interpreting magnetic data easier.