A magnetic interface inversion method for volcanic rock-type uranium deposits

Abstract

The invention belongs to the field of volcanic type uranium ore deposit magnetic data processing, in particular to a volcanic type uranium ore deposit magnetic interface retrieval method. The method specifically comprises the first step of obtaining magnetic survey data; the second step of obtaining precise longitude and latitude coordinates and elevation data of a measuring point; the third step of converting magnetic susceptibility data of rock mass and stratum in a prospecting region into CGS international system of units; the fourth step of obtaining an abnormal delta T value of the measuring point; the fifth step of conducting meshing processing on the elevation data and the magnetic abnormal delta T value of the gridding point; the sixth step of conducting pole change processing on magnetic abnormal delta T gridding data; the seventh step of establishing a constant gridding of an retrieval target interface; the eighth step of conducting retrieval on the target interface; the ninth step of amending an upper limit cutoff wavelength and a lower limit cutoff wavelength of a cosine filter parameter; the tenth step of obtaining a final magnetic interface grid. According to the technical scheme, quick and accurate exploration of underground mineral resources is achieved, and the volcanic type uranium ore deposit magnetic interface retrieval method has an importance practical significance in geological ore prospecting work.

Description

technical field [0001] The invention belongs to the field of magnetic data processing of volcanic rock type uranium deposits, and in particular relates to a magnetic interface inversion method of volcanic rock type uranium deposits. Background technique [0002] In the field of volcanic uranium deposit exploration, different types of rocks (such as broken porphyrylite, rhyolitic dacite, metamorphic rock, etc.) have obvious magnetic differences, and the intersection of different lithologies is often a favorable site for uranium mineralization. Therefore, the magnetic interface Information such as the ups and downs and depths of the rocks are particularly important. [0003] In the field of geophysical magnetic data processing, how to accurately infer the shape and depth of underground magnetic interface fluctuations in magnetic data processing and interpretation is often a difficult point in geophysical exploration. Due to the large magnetic difference between the volcanic c...

AI Technical Summary

Problems solved by technology

Due to the large magnetic difference between the volcanic caprock and the magnetic basement, conventional automatic gravity-magnetic interface inversion techniques such as the Parker inversion method can automatically determine the undulation depth of the magnetic interface, but due to the existence of the downward continuation factor, the inversion process Instability, and in areas with complex geological structures, there is error interference in the original data, and the downward continuation factor may lead to a decrease in the inversion accuracy or even divergence of the inversion results, which ultimately affects the accuracy of the depth of the magnetic interface

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