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Joint Inversion of Gravity and Magnetic Data Based on Improved Correlation Constraint
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019, Jun 2019, Volume 2019, p.1 - 5
Abstract
This paper proposed a kind of correlation constraint based on sine function for joint inversion of gravity and magnetic data. This new constraint is developed by conventional linear correlation constraint, but has better stability. At the same time, considering that the density contrast and magnetic contrast of the geological anomalies are not always of same sigh, which causes the density model and the magnetic model to be locally correlated but not globally correlated, we used the square of the density and the square of the magnetic instead of the density and the magnetic parameter to define the proposed correlation constraint. Then we gave the explicit form of the derivative of the proposed constraint with respect to the weighted density and magnetic parameter, which makes it easy to obtain the optimal solution of the objective function by the conjugate gradient algorithm in the weighted parameter domain. The method was applied to one model test to verify the feasibility.