重磁及其张量数据自动解释的不同阶梯度比值法

重磁异常梯度的比值能有效地均衡不同深度地质体异常的幅值，可提高对较小范围和较大埋深地质体的分辨率，且随着重磁勘探数据量和数据参数的不断增加自动解释方法受到越来越多的青睐。本项目将开发分辨率更高、实用性更强的不同阶梯度比值法来自动地完成场源体边界识别和位置参数计算，主要研究内容包括：1）不同阶梯度比值的构建及空间特征分析，给出不同阶梯度比值与地质体边界的对应关系；2）开发空间归一化不同阶梯度比值法来直接描述地质体的空间分布；3）推导不同阶梯度比值与场源体位置参数的对应方程，并讨论方程中有无构造指数（表征地质体类型的量）对反演结果精度的影响；4）重磁全张量数据自动解释的不同阶梯度比值会存在多个分量，讨论各分量加权方式对求解结果精度的影响。本项目所开发方法能有效地提高对地质体的分辨率，对于矿产资源勘探具有较强的实用价值，且求解方程形式和加权方式的探讨对于其它解释方法的应用具有宝贵的借鉴价值。

The gradient ratio of gravity and magnetic anomalies can balance the amplitude of the anomalies generated by the geologic bodies with different depths, and can improve the resolution to the sources with lesser extent and deeper depth, and the automatic interpretation methods have drawn more and more attention as the increasing of data volume and parameters of gravity and magnetic prospecting. This project will develop higher-resolution and more practical different-order gradient ratio method to automatically accomplish the edge detection and the computation of location parameters of the sources, and the main research contents contain: 1) Building the different-order gradient ratio and analyzing its spatial distribution features, and providing the corresponding relationship between the different-order gradient ratio and the edges of the source. 2) Developing the spatial normalized different-order gradient ratio method to directly delineate the distribution of geologic bodies. 3) Deriving the corresponding equations between the different-order gradient ratio and source location parameters, and discussing the presence of structural index (characterize the nature of the source) on the accuracy of the inversion results. 4) The different-order gradient ratio for the automatic interpretation of gravity and magnetic tensor gradient data has several components, and analyzing the weighting method of the components on the accuracy of the inversion results. The method developed by this project can improve the resolution to the geologic bodies, and has fairly practicality in the prospecting of mineral resources, and the discussion of the equation formation and weighting method has important value to the other interpretation methods.