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Geotectonic Controls on CO2 Formation and Distribution Processes in the Brazilian Pre-Salt Basins

1
Geology & Geophysical Department, Universidade Federal Fluminense, UFF, Niterói 2410-364, Brazil
2
Geology Department, F. Ciências Universidade de Lisboa, 1749-016 Lisboa, Portugal
3
Independent Consultant, Rio de Janeiro 22271-110, Brazil
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(6), 252; https://doi.org/10.3390/geosciences9060252
Received: 7 March 2019 / Revised: 14 May 2019 / Accepted: 16 May 2019 / Published: 5 June 2019
(This article belongs to the Special Issue Gas Hydrate: Environmental and Climate Impacts)
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Abstract

Exploratory work for hydrocarbons along the southeastern Brazilian Margin discovered high concentrations of CO2 in several fields, setting scientific challenges to understand these accumulations. Despite significant progress in understanding the consequences of high CO2 in these reservoirs, the role of several variables that may control such accumulations of CO2 is still unclear. For example, significant differences in the percentages of CO2 have been found in reservoirs of otherwise similar prospects lying close to each other. In this paper, we present a hypothesis on how the rifting geodynamics are related to these CO2-rich accumulations. CO2-rich mantle material may be intruded into the upper crustal levels through hyper-stretched continental crust during rifting. Gravimetric and magnetic potential methods were used to identify major intrusive bodies, crustal thinning and other geotectonic elements of the southeastern Brazilian Margin. Modeling based on magnetic, gravity, and seismic data suggests a major intrusive magmatic body just below the reservoir where a high CO2 accumulation was found. Small faults connecting this magmatic body with the sedimentary section could be the fairway for the magmatic sourced gas rise to reservoirs. Mapping and understanding the crustal structure of sedimentary basins are shown to be important steps for “de-risking” the exploration process. View Full-Text
Keywords: carbon dioxide; Santos Basin; potential methods; gravimetric data; magnetic data; mantellic source; Bouguer anomaly; São Paulo Plateau carbon dioxide; Santos Basin; potential methods; gravimetric data; magnetic data; mantellic source; Bouguer anomaly; São Paulo Plateau
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Gamboa, L.; Ferraz, A.; Baptista, R.; Neto, E.V.S. Geotectonic Controls on CO2 Formation and Distribution Processes in the Brazilian Pre-Salt Basins. Geosciences 2019, 9, 252.

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