The static effect is a commonly-existent technical problem in MT method,and its influence could lead to an unacceptable result of the observation data.According to the distinguishing method,correction method and the data collection system,the authors put forward a spatial-domain topological processing method based on the original data.Through the analysis of the cause and representation of the static effect and the superposition characteristics of electric field components,the authors began with the essence of space sampling and completed the formula for obtaining the topological curve,finally got the observation resuh with different pole distances at the same site and found out the implicit observation information in the observation system of continuous arrays.According to the analytical result of theoretical model,the authors established the model of all the possible static migrations of the record site with the change of pole distance in different parts of local inhomogeneous body and,in addition,established the basic topological result graphic display and interpretation method including using sites to do pseudo-section processing and using the fixed frequency result of all sites in a profile painting pseudo-planar graph.The authors also compiled the software of topological processing and finished this new method of using topological processing method to analyze the static effect of MT both in theory and in application.The test result proves that the topological processing could improve the quality of data.With this technique,the discrimination of static effect could begin with many aspects,could find out the spatial distribution of the distorted electrical field caused by local inhomogeneous body,and could find out the location and spatial distribution of the local inhomogeneous body,thus providing researchers with real information on the surface electric structure.The topological processing could also get the result of changing arrays,and this means the emerging of a new method for inhibiting interference.%静态效应是大地电磁测深中普遍存在的技术难题,这一影响使得观测结果的处理解释出现无法接受的误差.针对现有大地电磁测深静态效应判别、校正及数据采集装置,提出了以野外实际观测资料为基础的空间域拓扑处理技术.在分析静态效应的成因、表象以及平面波电场分量叠加特性的基础上,从空间采样的实质出发,完善了拓扑点曲线求取公式,获取了同一记录点不同极距的观测结果,提取了连续阵列观测装置中所隐含的变极距观测信息;依据理论模型分析建立了局部不均匀体上不同部位各记录点随拓扑观测极距变化可能出现的静态偏移模型,初步建立了以点进行拟剖面处理,以剖面上所有点的单一频点构成拟平面图来进行拓扑结果图形展示和分析解释的基本方法,并编制了相应的软件包,从理论和实践上初步建立了空间域拓扑处理研究静态效应这一全新的方法技术.实验结果表明,拓扑叠加处理会使资料品质提高,静态偏移效应的判别可从多个方面进行,可有效反映出不均匀体所产生的畸变电场的空间分布,从而可在一定程度上显示出不均匀体的空间位置和分布形态,为认识表层电性结构提供了一种客观的实测信息.同时,由于拓扑处理使观测装置的各种变化所能测得的结果被提取出来,意味着一种新的抑制干扰方法的出现.
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