Processing and analysis of geophysical data based on GIS

摘要

With rapid development of geophysical surveying in China, the geophysical data are increasing quickly. It is still a challenge how to apply these achievements of geophysical exploration in mineral resource evaluation. In recent years, Geographic Information System (GIS) has been widely applied in geophysical domain. GIS is a powerful tool to process, manage, analyze, and display geophysical spatial data. Taking the data of Lingshan area in Guangxi Province as an example, this paper presents the methods of data processing, integration, analysis and interpretation based on GIS. By using GIS spatial overlay analysis, the geophysical data were integrated and analyzed, and the relationships among relevant geophysical data and between geophysical data and subsurface structure were studied. The study has indicated that the northeast gravity anomaly treads is located on three northeast fault belts, and the aeromagnetic anomaly isolines extend basically along boundary fault and change abruptly along the fault boundary. The correlation analysis between middle and intense seism and gravity anomaly, anomaly aeromagnetic anomaly shows a close correlation between many middle and intense seism and gravity anomaly, aeromagnetic block anomaly tread and the location of boundary fault. This study shows that the GIS approach eases geophysical data analysis and interpretation.