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为解决Tilt梯度存在的“解析奇点”这一问题,介绍了Tilt梯度位场边界识别方法,并提出了改进算法.理论分析与模型计算表明,改进的Tilt梯度方法继承了垂向一次导数与传统Tilt梯度以零值线识别边界的性质,相对其他的导数类方法(如水平总梯度模等)能够更好地识别深部弱异常;此外,改进的Tilt梯度方法物理意义明确,从理论上避免了方法的畸变性.对韦岗矿区磁异常分析表明,除工区南侧由东向西分布的A、B、C 3个主体异常外,尤其是工区5号线以北的弱异常D得到显著增强.结合钻孔资料以及磁异常反演结果,认为弱异常D可能是由深部隐伏矿体的影响产生,结合二度半人机交互反演推测矿体埋藏深度在1 000~1 200m.6号线上的DH6-6见矿钻孔位于异常D的东侧,该钻孔钻遇的薄层铁矿体位置与弱异常D的范围相吻合;另外DH6-7未见矿钻孔位于该弱异常范围以外,若向西在5号线以北布置钻孔,则有见矿可能.
In order to solve the problem of “analytic singularity” existing in Tilt gradients, the method of boundary recognition of Tilt gradient field is introduced and an improved algorithm is proposed.Theoretical analysis and model calculation show that the modified Tilt gradient method inherits the vertical one Derivatives and traditional Tilt gradients recognize the boundary by zero-valued lines, which can identify deep weak anomalies better than other derivative class methods (such as horizontal total gradient modes). In addition, the improved Tilt gradient method has a clear physical meaning. From the theory The analysis of magnetic anomalies in Weigang mining area shows that except for A, B and C anomalies distributed from east to west on the south side of the work area, especially the weak anomaly D The results show that the weak anomaly D may be caused by the influence of the deep concealed orebodies. Combined with the second-half man-machine interactive inversion, it is inferred that the burial depth of the ore body is in the range of 1 000-1 200 m The DH6-6 mine borehole on line 6 is located on the east side of the anomaly D and the thin iron ore body intersected by this borehole coincides with the range of weak anomaly D. In addition, no mine borehole is found in DH6-7 Located outside the area of weak anomaly, west if it is north of line 5 Drilling set, there may see mine.