Earth Tides and H2 Venting in the Sao Francisco Basin, Brazil

Simon, Jacob B.; Fulton, P. M.; Prinzhofer, Alain; Cathles, L. M.

doi:10.3390/geosciences10100414

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…The origin of this periodic signal remains a matter of debate but it could come from atmospheric pressure variations (Cathles and Prinzhofer, 2020) or cyclic pulses in-depth (Myagkiy et al, 2020a,b). The earth's tide, on the opposite, happened to be neglectable and unable to explain the single daily maximum (Simon et al, 2020).…”

Section: Long-term Monitoringmentioning

confidence: 99%

Natural H₂ exploration: tools and workflows to characterize a play

Lévy,

Roche,

Pasquet

et al. 2023

Sci. Tech. Energ. Transition

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Natural dihydrogen (H2) exploration is now active in various countries, but tools and workflows that help to characterize prospective zones are still poorly defined. This review paper is dedicated to share our experience in characterizing H2 plays based on exploration efforts carried out in many countries in Europe, North and South America, Africa, and Oceania between 2017 and 2023. We decided to focus on onshore exploration where three main reactions are generating H2: (i) redox reactions between Fe2+ and H2O, (ii) radiolysis of water and, (iii) organic late maturation where H2 comes from hydrocarbons. This leads to classify the H2 generating rocks (H2_GR) into four types that seem us the more likely to be of economic interest: basic and ultrabasic rocks of oceanic/mantellic affinity (H2_GR1), iron-rich bearing sedimentary and intrusive rocks, (H2_GR2), radioactive continental rocks (H2_GR3) and organic matter-rich rocks (H2_GR4). For the pre-fieldwork, the workflow aims to target new promising areas for H2 exploration. Cross-referencing the presence of H2_GR in the basement, classical geological-hydrodynamic features (fault, water source), and already-known H2 occurrences at the surface remain essential but should be accompanied by remote sensing analyses to detect possible H2 occurrences. For the fieldwork, the focus is made on gas and rocks. A discussion is led concerning the importance of punctual measurements and long-term monitoring of gas seepages, that allow to conclude on dynamics of H2 leakage from depth through space and time. For the post-fieldwork, we present the most useful analytical tools to characterize H2 gas seepages and the suspected H2_GR. The critical parameters to estimate the H2 potential of a rock are the content in Fe2+/Fetot (H2_GR1 and H2_GR2), the content of radioactive elements U, Th, K (H2_GR3), and the total organic content (H2_GR4). The hydrogen exploration is in its infancy and all the profession is attempting to define an automated and fast workflow. We are still far away from it due to a lack of data, yet this review presents a practical guide based on the current knowledge.

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Section: Long-term Monitoringmentioning

confidence: 99%

Natural H₂ exploration: tools and workflows to characterize a play

Lévy,

Roche,

Pasquet

et al. 2023

Sci. Tech. Energ. Transition

View full text Add to dashboard Cite

show abstract

“…Finally, Simon et al [16] discount the possibility that solid Earth tides could be the cause of the variable venting in the Sao Francisco Basin by showing that solid Earth tides at the site have two co-equal peaks per day, but the H 2 venting has only one. We are just beginning to understand the H 2 system.…”

Section: H 2 Basin Resourcesmentioning

confidence: 99%

A Summary of “Future Advances in Basin Modeling: Suggestions from Current Observations, Analyses and Simulations”

Cathles

Fjeldskaar

2020

Geosciences

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“…The importance of this study is related to its immense potential for groundwater and also because the BSB karst may constitute important reservoirs of natural gas (Reis et al 2017, Alkmim 2018) and Pb-Zn-Ag and fluorine deposits related to hydrothermalism that occurred in the basin (Misi et al 2004, Nobre-Lopes 2002, Costa 2011. More recently, research has been carried out on the potential for natural H2 production (Prinzhofer et al 2019, Donzé et al 2020, Simon et al 2020.…”

Section: Introductionmentioning

confidence: 99%

Neoproterozoic-Cambrian structures as a guide to the evolution of the Bambuí karst in the Vieira river basin, Montes Claros, North of Minas Gerais, Brazil

Cavalcanti¹

2022

JGSB

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The Neoproterozoic-Cambrian deformation imposed on the rocks of the Bambuí sedimentary basin, in the northern region of Minas Gerais, generated a system of folds, faults and joints. These structures were studied on a regional (1:100,000), semi detail (1:50,000 and 1:25,000) and detail scales in the maps of caves (1:100). Based on these studies, it was concluded that in the region there is a cropping karst (epigenetic) in the limestones of the Lagoa do Jacaré Formation and another non-outcropping (hypogenic) in the limestones of Sete Lagoas Formation and that the main structures that controlled its development are the folds, joints (F1 and F2) and bedding (S 0 ). The F1 joints have NNE-SSW direction, are parallel to the front thrust and to the folds' axial planes, control the geometry of the surface drainage network, are the main directions of the rock faces of the limestone massifs, the karstic valleys and the conducts of the studied caves. Whereas the F2 joints have WNW-ESE direction, are perpendicular to the F1 family, control the surface drainage network and the directions of the cave conducts. The intersection planes between the bedding and the joints and/or among different joints is what defines the geometry of the karstic features in the area. The F1 joints also coincide with the direction of the normal fault that controls the São Francisco river direction in this region. The faults, which are the deepest structures, can function as a connection among the different aquifers of the area, including the recharge of the non-outcropping karstic aquifers of Sete Lagoas Formation.Neoproterozoic-Cambrian structures as a guide to the evolution of the Bambuí karst in the Vieira river basin,

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Earth Tides and H2 Venting in the Sao Francisco Basin, Brazil

Cited by 6 publications

References 9 publications

Natural H₂ exploration: tools and workflows to characterize a play

Natural H₂ exploration: tools and workflows to characterize a play

A Summary of “Future Advances in Basin Modeling: Suggestions from Current Observations, Analyses and Simulations”

Neoproterozoic-Cambrian structures as a guide to the evolution of the Bambuí karst in the Vieira river basin, Montes Claros, North of Minas Gerais, Brazil

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Earth Tides and H2 Venting in the Sao Francisco Basin, Brazil

Cited by 6 publications

References 9 publications

Natural H2 exploration: tools and workflows to characterize a play

Natural H2 exploration: tools and workflows to characterize a play

A Summary of “Future Advances in Basin Modeling: Suggestions from Current Observations, Analyses and Simulations”

Neoproterozoic-Cambrian structures as a guide to the evolution of the Bambuí karst in the Vieira river basin, Montes Claros, North of Minas Gerais, Brazil

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Resources

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Natural H₂ exploration: tools and workflows to characterize a play

Natural H₂ exploration: tools and workflows to characterize a play