An invernsion scheme with lateral segmented-combined constraints for time-domain airborne electromagnetic data
LIN Xingyuan1, LU Congde1, ZHONG Binghui2, FAN Chongxiao1
1. College of Geophysics, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. College of Information Science and Technology, Chengdu University of Technology, Chengdu, Sichuan 610059, China
Abstract：In order to ensure lateral continuity,lateral roughness constraints are applied in the inversion of time-domain airborne electromagnetic data.However,the lateral roughness constraint inversion requires multiple points to be calculated simultaneously and the calculation time of inversion increases sharply when the number of points increases up to a certain amount.Taking into account the lager data set of time-domain airborne electromagnetic,we propose an inversion scheme with lateral segmented-combined constraints.First,observation points are segmented.Then the lateral and vertical roughness constraints are used simultaneously in each data segment,and the lateral priori information constraint is used between the segments.Finally,effects of lateral and vertical roughness constraints and lateral prior information constraints on inversion accuracy and computation time are analyzed.The proposed inversion scheme can effectively reduce the calculation time with the segmentation.The lateral and vertical roughness constraints can ensure high inversion accuracy.Test of modeling data and real data verify the validity,calculation effectivity,and applicability of the proposed invernsion scheme.
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