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分析了近年利用重磁异常进行边界识别的方法,指出Tilt-angle法、Theta Map法等一类方法是通过计算重磁异常的高阶导数及其比值来增强地质边界信息,由于高通滤波对数据误差放大,在一个计算点上两种导数的比值可能会有比较大的波动,导致实际资料计算结果无法利用。为了避免在一个点计算比值造成波动的影响,笔者采用总水平导数均值归一的方法,避免了实际资料处理结果的振荡;同时,对不同强度的总水平梯度异常采用不同的均值进行归一,突出了弱地质边界信息。将该方法应用于大杉树钒钛磁铁矿远景区对辉长岩的边界识别,得到较好的地质效果。
This paper analyzes the methods of boundary recognition using gravity and magnetic anomalies in recent years and points out that the Tilt-angle method and the Theta Map method enhance the geological boundary information by calculating the high-order derivatives and their ratios of gravity and magnetic anomalies. Error amplification, in a calculation of the ratio of the two derivatives may be relatively large fluctuations, resulting in actual data calculation results can not be used. In order to avoid the influence of volatility caused by the ratio calculation at a single point, the author adopts the method of normalizing the mean of the total horizontal derivative to avoid the oscillation of the actual data processing result. At the same time, different mean total gradient errors of different intensities are normalized, Highlight the weak geological boundary information. The method is applied to the boundary recognition of gabbro in the prospective area of Dashashu vanadium-titanium magnetite to obtain a better geological effect.