CSAMT数据三维可视化的方法

The 3D-visualization methods for CSAMT data

CSAMT(可控源音频大地电磁法)是地球物理勘探中电法勘探的一种经济且有效的方法,传统的方式是通过手动或自动的方法绘制剖面图、等值线图等来展示其探测的数据,这些方式往往具有数据展示不全面、效果不直观等缺点.为了克服这些缺点,本文利用计算机三维可视化技术,以甘肃玉门某地区的数据为例,探索并实现了CSAMT数据三维可视化构模的方法.文中首先分析了CSAMT数据的存储方式与空间分布,提出了一种高性能的数据读取与组织算法;接着文章根据原始的数据信息,提出了基于探测方向数据点生成TIN的方法,建立了测线模型;为了更好地预测勘探范围内的三维空间情形,文章实现了一种高效的CSAMT数据快速局部插值算法,进而实现了数据场模型的建立.本研究表明,通过三维可视化技术将CSAMT数据建立并绘制成三维虚拟模型,能更加直观、更加全面地展示该数据,可为地质解释与规划决策服务,具有较好的推广前景.

CSAMT （Controlled source audio magneto-telluric method） is an economical and effective method for geophysical electrical-exploration. To show the exploration data, the traditional ways are through manually or automatically drawing profiles, contour maps and etc. However, these ways are usually with the shortcoming of data showing incomplete, and the results are not intuitive. In order to overcome these shortcomings, in this paper we using the computer 3D-visualization technology, taking the data from an area in Gansu Yumen as an example, explore and realize the modeling methods for 3D-visualization of CSAMT data. Above all, we analyze the storage mode and spatial distribution of CSAMT data, and propose a high-performance algorithm for data reading and organization. According to the original data, we present a method of generating TIN based on the data points in exploration direction, and implement the modeling of exploration ling In order to predict the 3D spatial circumstances of exploration space, we also present an efficient and rapid partial interpolation method for CSAMT data, and then we create the models of data field. This paper indicates that the data will been shown more intuitively and comprehensively by using 3D-visualization technology to model and draw CSAMT data into virtual 3D-models, and can service for geologic interpretation and decision-making and planning, and also have good prospects for promotion.