Inversion of gravity full tensor gradient data based on U-Rnet network
Gravity inversion is one of the important means to obtain the spatial structure and physical properties of underground geological bodies through surface information,and each gravity gradient component represents different geological body information.Gravity inversion combined with gravity gradient components can better reflect the shape and distribution of underground abnormal bodies.In this paper,a neural network-based algo-rithm for gravity full tensor data inversion is proposed.The U-Rnet network is applied to three-dimensional gravity full tensor data inversion.In order to test the effectiveness of the algorithm,six representative models are used for simulation experiments,and inversion results with clear boundaries and sparsity are obtained.Firstly,by comparing the inversion results of L2 and Tversky loss functions,it is found that the inversion re-sults corresponding to Tversky loss functions can clearly represent the boundary position of the model.Then,by comparing the inversion results of different gradient tensor combinations,the results of four tests show diffe-rent inversion accuracy on three directions(x,y,z),and the test 4 shows the lowest fitting error.Finally,the proposed method is applied to the FTG data of Vinton Salt Dome in Texas,USA,and the inversion results are consistent with the real geological information.
gradient tensorU-Rnet networkforward simulationgravity inversionVinton Salt Dome
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