重磁资料面积处理中的滤波增强技术与应用

Filtering enhancement of gravity and magnetic data in the dense ladder-like zone.

在磁法资料面积处理中,为了突出断层信息,有效地进行异常体边界划分,提出了一种梯级带滤波增强非线性滤波技术。该方法打破传统的窗口加权平均的经典模式,将一个统一的加权区域采用4种不同分割方式划分成2个子域,在给定的准则下,选择其中均方差最小的子域的异常均值作为整个窗口滑动滤波处理的均值进行处理,这样对断层及异常边界的划定更为精确。选取了西部敦煌盆地的航磁资料,该区表层火成岩出露广,磁性强,断层模糊,通过梯级带滤波增强非线性滤波技术处理,断层和异常体边界十分明显,为地质资料的准确解释提供了保证。

In order to position the faults and outline the boundary of anomaly, a technology of filtering enhancement in the dense ladder-like zone was put forth. Unlike the traditional model in which weighted window was used, the weighted area are divided into two sub-areas with four different kinds of division rules. In each sub-area residuum was calculated. The average value of anomaly in sub-area with minimal residuum was chosen to processing the whole window data This guarantees the technology is in focus of faults and boundaries. Aero-magnetic data in northwest China was used to test the validity, the result shows that the faults and the boundaries of anomalies are identified clearly, thus the geological interpretation precision is improved.