Method for automatically extracting structural framework from potential field data

A computer-implemented method for automatically extracting a structural framework, comprising the following steps:

• preprocessing magnetic data or gravity survey data from a study area to obtain total magnetic intensity (TMI) anomaly data or Bouguer gravity anomaly data;
• gridding the TMI anomaly data or the Bouguer gravity anomaly data, and upward continuing the gridded TMI anomaly data or the Bouguer gravity anomaly data for a plurality of predetermined heights to obtain a plurality of gridded TMI anomaly data or Bouguer gravity anomaly data Th at corresponding scales to the plurality of predetermined heights, wherein h represents height after upward continuation;
• respectively calculating a tilt derivative TDRh of the TMI anomaly data or the Bouguer gravity anomaly data at each of the corresponding scales from the gridded TMI anomaly data or Bouguer gravity anomaly data Th at each of the corresponding scales;
• applying multidirectional edge detection based on a horizontal gradient respectively to the tilt derivative of the gridded TMI anomaly data or Bouguer gravity anomaly data at each of the corresponding scales to obtain edges of source bodies of magnetic or gravity anomalies at the corresponding scales;
• and
• thinning the obtained edges of source bodies of magnetic or gravity anomalies at the corresponding scales respectively into single-pixel width with a morphological skeleton algorithm to obtain a plurality of structural framework maps at the corresponding scales, wherein information is obtained from the plurality of structural framework maps about geological structures controlling a formation of ore deposits to achieve localization of targets of the ore deposits.