Method of self-structure-constrained inversion of magnetic anomalies and their magnetic gradients and its application in the exploration of coal burning area
With the development of aeromagnetic measurement technology,aeromagnetic measurement can carry out the measurement of the original field and the gradient field,the gradient field has a higher resolution,so its combination measurement has been widely used.In order to effectively extract high-resolution physical structures of underground geologic bodies and obtain higher resolution results based on magnetic and magnetic gradients,a self-structure-constrained magnetic and magnetic gradient collaborative inversion method is developed,which uses the inversion results of single-component data as the structural constraint term of the joint inversion of data of different parameters.Therefore,the resolution features of different data are effectively used as constraints to obtain more accurate results.In addition,a collaborative inversion method based on unstructured tetrahedral mesh is established based on its advantages of good terrain,applicability of irregular geological bodies and resolution.Model tests show that the unstructured tetrahedral mesh collaborative inversion method has higher accuracy for subsurface field source recovery.Two aeromagnetic measurements show that the burning area is still in a burning state and develops in both horizontal and vertical directions at a rate of about 0.5 m/day.
Magnetic and magnetic gradient collaborative inversionUnstructured gridSelf-structured constrained inversionAeromagnetic measurementBurning area
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