三维多层介质重力-地震同步联合反演

3-D Joint Inversion of Gravity and Seismic Data for multilayer medium

联合反演是地球物理勘探的重要解释手段,能够提高模型参数的反演精度.本文在归纳和分析重力与地震资料联合反演的研究和应用现状的基础上,利用三维多层介质模型的地震走时和重力正演公式,推导了地震走时和重力异常对界面深度的雅可比矩阵,实现了三维重力-地震同步联合反演界面成像.最后进行了数值理论模型模拟和实例计算,结果表明地震走时和重力同步联合反演很好的重建了三维多层介质界面.

Joint inversion is an important means of geophysical interpretation, which can improve the accuracy of the inversion for the model parameters. This paper summarizes and analyzes the current state of the research and application of joint inversion using gravity and seismic data. Then, we employ the forward formula of seismic travel time and gravity anomaly in a 3D Multi-layer media model to deduce the Jacobian matrix of travel time and gravity anomaly with interface. On the base of these results, we implement the joint inversion of gravity and seismic data in a 3D Multi-layer media model for imaging interface. We perform a numerical simulation and calculation on real data to verify this method. The results show that joint inversion using gravity and seismic data can reconstruct the model interface well.