Geotectonic Controls on CO<sub>2</sub> Formation and Distribution Processes in the Brazilian Pre-Salt Basins
Exploratory work for hydrocarbons along the southeastern Brazilian Margin discovered high concentrations of CO<sub>2</sub> in several fields, setting scientific challenges to understand these accumulations. Despite significant progress in understanding the consequences of high CO<sub&...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2019-06-01
|
Series: | Geosciences |
Subjects: | |
Online Access: | https://www.mdpi.com/2076-3263/9/6/252 |
id |
doaj-805cc4e56d2641be9563c01cf1d05f37 |
---|---|
record_format |
Article |
spelling |
doaj-805cc4e56d2641be9563c01cf1d05f372020-11-24T23:55:24ZengMDPI AGGeosciences2076-32632019-06-019625210.3390/geosciences9060252geosciences9060252Geotectonic Controls on CO<sub>2</sub> Formation and Distribution Processes in the Brazilian Pre-Salt BasinsLuiz Gamboa0André Ferraz1Rui Baptista2Eugênio V. Santos Neto3Geology & Geophysical Department, Universidade Federal Fluminense, UFF, Niterói 2410-364, BrazilGeology & Geophysical Department, Universidade Federal Fluminense, UFF, Niterói 2410-364, BrazilGeology Department, F. Ciências Universidade de Lisboa, 1749-016 Lisboa, PortugalIndependent Consultant, Rio de Janeiro 22271-110, BrazilExploratory work for hydrocarbons along the southeastern Brazilian Margin discovered high concentrations of CO<sub>2</sub> in several fields, setting scientific challenges to understand these accumulations. Despite significant progress in understanding the consequences of high CO<sub>2</sub> in these reservoirs, the role of several variables that may control such accumulations of CO<sub>2</sub> is still unclear. For example, significant differences in the percentages of CO<sub>2</sub> 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 CO<sub>2</sub>-rich accumulations. CO<sub>2</sub>-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 CO<sub>2</sub> 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.https://www.mdpi.com/2076-3263/9/6/252carbon dioxideSantos Basinpotential methodsgravimetric datamagnetic datamantellic sourceBouguer anomalySão Paulo Plateau |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Luiz Gamboa André Ferraz Rui Baptista Eugênio V. Santos Neto |
spellingShingle |
Luiz Gamboa André Ferraz Rui Baptista Eugênio V. Santos Neto Geotectonic Controls on CO<sub>2</sub> Formation and Distribution Processes in the Brazilian Pre-Salt Basins Geosciences carbon dioxide Santos Basin potential methods gravimetric data magnetic data mantellic source Bouguer anomaly São Paulo Plateau |
author_facet |
Luiz Gamboa André Ferraz Rui Baptista Eugênio V. Santos Neto |
author_sort |
Luiz Gamboa |
title |
Geotectonic Controls on CO<sub>2</sub> Formation and Distribution Processes in the Brazilian Pre-Salt Basins |
title_short |
Geotectonic Controls on CO<sub>2</sub> Formation and Distribution Processes in the Brazilian Pre-Salt Basins |
title_full |
Geotectonic Controls on CO<sub>2</sub> Formation and Distribution Processes in the Brazilian Pre-Salt Basins |
title_fullStr |
Geotectonic Controls on CO<sub>2</sub> Formation and Distribution Processes in the Brazilian Pre-Salt Basins |
title_full_unstemmed |
Geotectonic Controls on CO<sub>2</sub> Formation and Distribution Processes in the Brazilian Pre-Salt Basins |
title_sort |
geotectonic controls on co<sub>2</sub> formation and distribution processes in the brazilian pre-salt basins |
publisher |
MDPI AG |
series |
Geosciences |
issn |
2076-3263 |
publishDate |
2019-06-01 |
description |
Exploratory work for hydrocarbons along the southeastern Brazilian Margin discovered high concentrations of CO<sub>2</sub> in several fields, setting scientific challenges to understand these accumulations. Despite significant progress in understanding the consequences of high CO<sub>2</sub> in these reservoirs, the role of several variables that may control such accumulations of CO<sub>2</sub> is still unclear. For example, significant differences in the percentages of CO<sub>2</sub> 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 CO<sub>2</sub>-rich accumulations. CO<sub>2</sub>-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 CO<sub>2</sub> 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. |
topic |
carbon dioxide Santos Basin potential methods gravimetric data magnetic data mantellic source Bouguer anomaly São Paulo Plateau |
url |
https://www.mdpi.com/2076-3263/9/6/252 |
work_keys_str_mv |
AT luizgamboa geotectoniccontrolsoncosub2subformationanddistributionprocessesinthebrazilianpresaltbasins AT andreferraz geotectoniccontrolsoncosub2subformationanddistributionprocessesinthebrazilianpresaltbasins AT ruibaptista geotectoniccontrolsoncosub2subformationanddistributionprocessesinthebrazilianpresaltbasins AT eugeniovsantosneto geotectoniccontrolsoncosub2subformationanddistributionprocessesinthebrazilianpresaltbasins |
_version_ |
1725462728691154944 |