Method for applying seven-level anomaly division method to medium-large scale geochemical exploration data

The invention discloses a method for applying a seven-level anomaly division method to medium-large scale geochemical exploration data, which comprises the following steps of: S1, distributing data points on the center of a grid by adopting average value gridding interpolation because point positions of medium-large scale area survey discrete data are not positioned at the center position of the regular grid generally; s2, three-parameter calculation of WIG, Al2O3/TiO2 and K2O/SiO2 is conducted by means of 1: 200,000 geochemical exploration data of the research area, and three parameters of 1: 200,000 data are obtained; s3, performing nearest point gridding interpolation on the three parameters of the 1: 200,000 data according to the regular grids of the medium-large scale, so that the data gridding densities of the two parameters are the same; s4, matching the two kinds of grid data, and then performing anomaly determination and grading evaluation on medium and large scale geochemical exploration data by usi