3D MAGNETIC INVERSION METHOD BASED ON THE ASSEMBLAGE OF 2D FORWARD MODELING AND INVERSION AS A TECHNIQUE TO REFLECT THE A-PRIORI INFORMATION

摘要

The present invention proposes a method for reflecting three-dimensional (3D) advance information and, particularly, a 3D magnetic inversion method for reflecting advance information using two-dimensional (2D) forward modeling and 2D inversion, which is capable of forming a 3D advance information model and a 3D initial magnetic susceptibility model based on a combination of 2D forward modeling and 2D inversion and performing 3D magnetic inversion based on the models. The proposed method of the present invention comprises the steps of: selecting a region of interest to perform 3D magnetic inversion on a magnetic anomaly map for a research area and separating 2D measuring lines in the selected region of interest; forming a combination of 2D measuring lines using data on the 2D measuring lines separated in the region of interest, respectively performing 2D forward modeling and 2D inversion for 2D measuring lines included in advance information, respectively generating a set of 2D weighting function sections and a set of 2D magnetic susceptibility sections for the 2D measuring line data, and respectively a 3D advance information model and a 3D initial model using the set of 2D weighting function sections and the set of 2D magnetic susceptibility sections; progressing 3D magnetic inversion for the region of interest using the 3D advance information model and the 3D initial model; and displaying a magnetic susceptibility cube for the region of interest. Thus, the method for reflecting advance information using 2D forward modeling and 2D inversion of the present invention is a practical technique capable of successively lessening non-uniqueness of 3D magnetic inversion and drawing geologically meaningful, reasonable inversion results. [Reference numerals] (S11) Input a magnetic anomaly map for a research area; (S13) Display a region of interest on the magnetic anomaly map; (S15) Display 2D measuring lines in the region of interest; (S21-1) 2D forward modeling; (S21-2) 2D inversion; (S23-1) Generate 2D weighting function sections; (S23-2) Generate 2D magnetic susceptibility sections; (S25-1,S25-2) Input all the advance information; (S27-1) Generate a 3D advance information model; (S27-2) Generate a 3D initial model; (S30) 3D inversion; (S40) Analyze a magnetic susceptibility cube