Structural controls of the migration of mantle-derived CO2 offshore in the Santos Basin (Southeastern Brazil)

• DOI: 10.3389/feart.2023.1284151
• Publication Date: 2024-01-09T16:37:15Z
• Authors: Rafael André Belo...; Marcelo José Carv...; Cristiano Leite S...; Davy Raeder Brandão; Michelle Mepen; André Luiz Ferrari; Luiz Antônio Pier...
• Keywords: Lithology; Peridotite

We present a multi-scale conceptual model based on structural controls of the migration mantle-derived CO 2 offshore in Santos Basin (Southeastern Brazil). assembled from regional 2D seismic reflection line integrated with potential gravimetric field data and local 3D volume well (lithologies situ stress). (i) The geochemical isotope range δ 13 C CO2 falls mostly within −7‰ −5‰ shows relatively high values for 3 He/ 4 He represented by an R/Ra rate up to 5.60, indicating mantle generation degassing. (ii) Seismic interpretation feasibly validated responses crustal structure (Moho discontinuity) show through deep-seated faults region highly stretched continental crust oceanward uprising. (iii) Early Cretaceous basement highs generated obliquely syn-rift faulting system control accumulation thermogenic travertines (hydrothermal carbonate reservoirs lakes), Aptian evaporites subsequently trap it.