Journal of Geo-information Science >
A Methodology for 3D Geological Mapping Based on Geophysical Data Grids and Its Implementation
Received date: 2015-08-05
Request revised date: 2015-10-29
Online published: 2016-06-10
Copyright
The geophysical methods (gravity, seismic, electric etc.) are the major tools used in geological investigation and mapping. From the 2D geological mapping to the 3D geological mapping, the amount of data and work has rapidly increased. This requires some improvements in processing the geophysical data interpretation to promote and strengthen its role in the 3D geological mapping works. Since the geophysical data are recorded in forms of data grids, traditionally, people need to extract the geological information from various data grids acquired from different geophysical methods, and then manually integrate the information to construct a 3D geological model. This usually causes inconveniences and inefficiencies. Therefore, this study proposes a methodology of 3D geological mapping with the geophysical data grids. It firstly constructs some visualization models from different geophysical data grids. Then, it subsequently integrates these models for interpretation using the mapping rules adopted from the physical properties of rock samples measured in laboratory. And finally, it converts the interpreted visualization model into the 3D geological model. Based on this methodology, we implement the corresponding system which accomplishes the above processes efficiently. As an example, we presented a detailed description for constructing the 3D lithological model using the methodology mentioned above with the geological survey data acquired in the geological investigation of western Jungger, Xinjiang in China. The practical application demonstrates that the methodology has a high degree of automation and it can effectively solve the problems of 3D geological mapping in cases such as the lack of sufficient geological sampling information while having enriched geophysical data.
YU Xiangyu , XU Yixian . A Methodology for 3D Geological Mapping Based on Geophysical Data Grids and Its Implementation[J]. Journal of Geo-information Science, 2016 , 18(6) : 742 -748 . DOI: 10.3724/SP.J.1047.2016.00742
Fig. 1 Process of the method图1 方法流程 |
Fig. 2 The visualization model of resistivity图2 电阻率可视化模型 |
Fig. 3 The visualization model of S-wave velocity图3 S波速度可视化模型 |
Fig. 4 The visualization model of resistivity after reconciliation图4 变换后的电阻率可视化模型 |
Tab. 1 Comparison of the results for several models表1 几种模型比较结果 |
模型名称 | 准确性/(%) | 收敛能力 | 泛化能力 |
---|---|---|---|
模糊神经网络(FNN) | 85.4 | 好 | 很好 |
模糊聚类 (FCM) | 76.6 | 很好 | 好 |
硬聚类(HCM) | 68.8 | 很好 | 差 |
BP神经网络(BPNN) | 81.6 | 差 | 差 |
支持向量机(SVM) | 79.5 | 差 | 很好 |
Fig. 5 Architecture of the FNN model图5 模糊神经网络结构 |
Tab. 2 Interpretation functions of different fuzzy rules表2 几种解释函数形式 |
函数类型 | 函数形式 |
---|---|
常数型 | |
线性函数 | |
二次函数 | |
变形二次函数 |
Fig. 6 An example of cell decomposition图6 格网单元分解示例 |
Fig. 7 The 3D geological model of lithology图7 岩性三维地质模型 |
Fig. 8 The 3D model of a specific lithology图8 特定岩性分布模型 |
Fig. 9 The analysis model of a cut effect in software图9 剖切分析模型效果 |
The authors have declared that no competing interests exist.
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