天然源大地电磁法在构造勘察中的应用研究

Research on Application of Natural Source Audio Frequency Magnetotellurics in Structure Exploration

研究目的:近年来,随着铁路的建设,铁路线位深入到丘陵山区的情况越来越多,在铁路断层构造勘察中,传统物探方法的局限性越来越明显。针对断层构造勘察,对天然源(音频)大地电磁法(AMT)的处理和解释等方面进行深入的研究,目的是提高物探对断层构造勘察的精度及使断层构造勘察基本不受限制。研究结论:(1)在铁路断层构造勘查中,天然源(音频)大地电磁法(AMT)与传统物探方法相比,具有受地形影响小,快捷,勘探深度大,成本低等优势;(2)自主研发的数据处理方法,将天然源(音频)大地电磁法(AMT)与人工源(可控源音频)大地电磁法(CSAMT)使用同一平台进行数据处理,解决了以往存在反演过于平滑,异常均一化的缺陷,断层构造勘察效果更加明显,查明了断层构造分布格局;(3)为对铁路选线提供了有力的依据,对类似情况的铁路断层构造勘察具有很强的指导意义。

Research purposes： With the rapid railway construction, more and more railway lines pass through the bill and mountain areas in recent years, the limitations of the conventional geophysical methods are more and more obvious when they are used for the fault structure exploration for railway. The research is done on the data processing and interpretation of the natural source audio frequency magnetollurics for the fault structure exploration for the purpose of improving the accuracy of fauh structure survey and basically having no limitation in the faut structure survey. Research conclusions： In the fault structure exploration for railway, compared with the conventional geophysical methods, the natural source audio frequency magnetotellurics has the features of the rapid survey with less topographical limitation, big survey depth and low cost. With the self- developed data processing methods, the same platform can be used for processing the data of the natural source audio frequency magnetollurics and CSAMT to solve the defect that the inversion is too smooth and abnormal homogenization, getting good survey effect on the fault structure exploration and finding out the distribution pattern of fault structure. It provides a strong basis for the railway alignment and guiding significance to the similar works.