固定点源测深激电异常研究

The study of 3-D IP anomaly by fixed point source sounding

电阻率法三维有限元数值模拟方法的实现,给研究形状复杂的地质体的电性异常提供了有力工具.本文利用该数值模拟程序,通过先模拟计算模型的视电阻率,然后利用视电阻率和视极化率的转换公式转换,从而实现对激电异常的数值模拟.文章计算并分析了固定点源测深法在各种1-D、2-D、3-D模型下的激电异常规律及定量解释结果,力求使人们从空间不同角度了解该方法的IP异常规律,从而指导野外生产实践,提高解释效率和精度.

The realization of 3-D FEM of resistivity gives a powerful tool for studying a multi-shape geologic body. In this paper, the author has implemented the 3-D IP modeling. Firstly, the approximate resistivity of models have been computed. And then the approximate polarizability has been transformed by formula. This paper analyzes the IP anomaly and results of quantitative interpretation of FPS on 1-D,2-D and 3-D models with FEM. People could know the IP anomaly laws from several directions of half space, and then we could instruct in the practice and improve the efficient and accuracy of interpretation.