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重磁场二次导数法是对复杂重磁异常进行滤波的一种重要手段,研究基底构造,突出隐伏在区域背景场中的局部异常,都能取得良好效果.在已发表的文献中,对各类地质体的二次导数异常的特征,均未作过详细介绍.本文从理论上并结合一些实践经验,探讨几种形状规则的地质体的二次导数异常的特征,并对如何利用重磁场二次导数异常来推断地质体的度数、埋深、边界、构造线部位等问题提出一些看法.另外还讨论了在计算时选择最佳计算半径等问题.
The second derivative method of heavy and magnetic field is an important method to filter complex gravity and magnetic anomalies, and it can achieve good results by studying the basement structure and highlighting the local anomalies concealed in the regional background field.In the published literature, The characteristics of the second derivative anomaly of the geologic body have not been described in detail.Based on some theoretical and practical experiences, this paper explores the characteristics of the second derivative anomaly of several regular geological bodies, The second derivative anomaly to infer the degree of geological body, burial depth, boundary, tectonic line and other issues put forward some views.In addition, the calculation of the choice of the optimal calculation of the radius and other issues.