Comparative Assessment of 3D Gravity Inversion Strategies Using SimPEG: A Case Study from Campos Basin, offshore Brazil

This work assesses 3D gravity inversion strategies in Campos Basin, Brazil, using SimPEG. It compares L2 and IRLS approaches, varying regularization weights and data uncertainties. L2 inversions produced smooth models; IRLS, especially with vertical regularization, yielded sharper, geologically plausible structures. Best models revealed distinct density contrast patterns at -10 km, -20 km, and -40 km depths. These findings highlight the importance of selecting appropriate inversion strategies and SimPEG's applicability in regional gravity studies. The proposed methodology provides a robust foundation for future joint inversions. A specific anomaly zone in the southwestern Campos Basin will be further investigated via magnetic and joint gravity-magnetic inversion, exploring its association with structurally controlled hydrothermal processes.