3D Probabilistic Inversion of Potential Fields Data using Geological Constraints

In geological and mining exploration applications, seismic profiles as well as gravity and magnetic data are often available. Interpreted seismic cross-sections directly provide data that can be processed directly as geometric constraints for 3D modelling. On the other hand gravity and magnetic data provide indirect constraints. Presently, a 3D geological model is considered as the initial state of a constrained inverse modelling of this data. That inversion is based on an iterative method (Bosch et al. 2001), which is applied to a discrete version of the domain under study. This inversion formulation allows separate inversion of either gravity or magnetic data or simultaneous inversion of both datasets and tensor components of gravity and magnetic field. The final result is a probabilistic 3D geological model. We will illustrate the method of a combined gravity and magnetic inversion with different examples.