Study on initial model construction of full-waveform inversion in underground coal mine
In order to improve the operational efficiency of full-waveform inversion(FWI)in the working face of underground coal mine,a method for solving the time field of 3D functional equations was explored.The initial model was characterized by inversion from transmission initial travel time,and the reliability of the algorithm was verified by establishing a complex geological model with faults for theoretical calculation of forward and inversion modeling.Based on the actual data of Xiaobaodang No.2 Coal Mine working face,the coal rock boundary was preliminarily characterized,the initial model was improved,and the gradient results of FWI were enhanced through the effective information of refracted transverse and longitudinal waves,which indicated that the research results could be used for high-precision detection of coal mine working faces and the establishment of a more optimal FWI system.
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