物化探等值线图数据提取方法研究与应用OA

The secondary development research of old geological data is an important part of geological exploration.With the continuous advancement of new data processing technologies,many new insights and significant geological exploration achievements have been yielded.However,this historical data,which is often outdated and lacks original datasets,poses new challenges for secondary development.This study takes the contour plan from old geological data as a starting point and extracts the area data from it with commonly used geological exploration software,providing the foundation for further processing and analyzing data with various advanced technological means.By extracting data from the 1∶50 000 aerial magnetic survey ΔT contour plan of the coverage area around Huajialing in Tongwei county of Gansu province,and comparing it with the original data in terms of average relative error and results,the performance indicators were evaluated.After calculation,the average relative error is 3.28 nT,and the regional features and local details on the two contour plans are almost identical,and complete information of the original data was obtained,showing the quality and accuracy of the extracted data are reliable.Horizontal and vertical derivatives were analyzed on the extracted area data,5 fault structures were identified and the range of hidden rock masses was delineated,providing a direct basis for further analysis of the prospecting background.