Well productivity controlling factors in crystalline terrains of southeastern Brazil

Neves, Mirna Aparecida; Morales, Norberto

doi:10.1007/s10040-006-0112-6

Cited by 41 publications

(24 citation statements)

References 23 publications

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“…, 1990; Key, 1992; Wright, 1992; Faillat et al. , 1999; Lasm and Razack, 2001; Razack and Lasm, 2006; Neves and Morales, 2007; Bamory et al. , 2008; Batte et al.…”

Section: Discussion Of Some ‘Established’ Concepts In Hr Hydrogeologymentioning

confidence: 99%

“…, 2007), pre‐existing heterogeneities within the HR such as veins (quartz veins, pegmatite, aplite, etc. ), dykes, ancient fractures or joints, or even contacts between different geological units (see for instance Neves and Morales, 2007; Le Borgne et al. , 2004, 2006a,b; Durand et al.…”

Section: The Fracture Permeability Of Hra Is Due To Weatheringmentioning

confidence: 99%

“…Several other authors have described and ⁄ or characterized the assumed structure of HRA and stated that their fracturing is of tectonic origin (see for instance Guiraud et al, 1990;Key, 1992;Wright, 1992;Faillat et al, 1999;Lasm and Razack, 2001;Razack and Lasm, 2006;Neves and Morales, 2007;Bamory et al, 2008;Batte et al, 2008;Kouame´et al, 2010). And yet they did not demonstrate that hypothesis.…”

Section: Genetics Of the Fissured Layer By Tectonic Fracturingmentioning

confidence: 99%

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The fracture permeability of Hard Rock Aquifers is due neither to tectonics, nor to unloading, but to weathering processes

Lachassagne

Wyns

Dewandel³

2011

Terra Nova

210

154

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Terra Nova, 23, 145–161, 2011 Abstract The hydrogeology of superficial (∼0–100 m b.g.l.) Hard Rock Aquifers (HRA; i.e. plutonic and metamorphic rocks) has so far been dominated by a few concepts considered to be relevant by a large majority of the HRA community. One of the most fundamental of these concepts is that their (secondary, fissure/fracture) permeability is either of tectonic origin or related to unloading processes. We will show that these genetic concepts are erroneous. We will demonstrate how the hydraulic conductivity of HRAs is a consequence of the (palaeo) weathering processes, with a stratiform fissured layer located immediately below the unconsolidated saprolite and, to a lesser extent, a verticalized fissured layer at the periphery of (or within) pre‐existing discontinuities (veins, joints, ancient faults, lithological contacts, etc.). This result opens up large perspectives in terms of applied hydrogeology and applied geology. A specifically dedicated methodological toolkit well adapted to the operational survey, management and protection of HRAs is briefly presented.

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“…, 1990; Key, 1992; Wright, 1992; Faillat et al. , 1999; Lasm and Razack, 2001; Razack and Lasm, 2006; Neves and Morales, 2007; Bamory et al. , 2008; Batte et al.…”

Section: Discussion Of Some ‘Established’ Concepts In Hr Hydrogeologymentioning

confidence: 99%

Section: The Fracture Permeability Of Hra Is Due To Weatheringmentioning

confidence: 99%

Section: Genetics Of the Fissured Layer By Tectonic Fracturingmentioning

confidence: 99%

See 1 more Smart Citation

The fracture permeability of Hard Rock Aquifers is due neither to tectonics, nor to unloading, but to weathering processes

Lachassagne

Wyns

Dewandel³

2011

Terra Nova

210

154

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“…The low storativity of the local fractured bedrock can be also compensated either by matrix water stored in adjacent rock (Moench, 1984;Warren and Root, 1963) or by storage in connected reservoirs (Dewandel et al, 2011;Leray et al, 2013;Neves and Morales, 2006;Roques et al, 2014;Stober and Bucher, 2006). In the case of fault, models of transient hydrodynamic behaviour during pumping are now well established (Anderson, 2006;Dewandel et al, 2014Dewandel et al, , 2011Rafini and Larocque, 2012;Roques et al, 2014).…”

Section: Introductionmentioning

confidence: 98%

“…Fault zones are characterized by an internal structural complexity (Bense et al, 2013;Caine et al, 1996) which control their capacity to drain or to act as barrier to groundwater flow. High permeable fault zones have been described at relatively great depth (>200 m) in the Armorican Massif Le Borgne et al, 2006;Leray et al, 2013;Roques, 2013;Roques et al, 2014) and in other crystalline basements (Holland and Witthüser, 2011;Mabee, 1999;Masset and Loew, 2010;Neves and Morales, 2006;Seebeck et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Groundwater sources and geochemical processes in a crystalline fault aquifer

Roques

Aquilina

Bour

et al. 2014

Journal of Hydrology

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International audienceThe origin of water flowing in faults and fractures at great depth is poorly known in crystalline media.This paper describes a field study designed to characterize the geochemical compartmentalization of adeep aquifer system constituted by a graben structure where a permeable fault zone was identified. Analysesof the major chemical elements, trace elements, dissolved gases and stable water isotopes reveal theorigin of dissolved components for each permeable domain and provide information on various watersources involved during different seasonal regimes. The geochemical response induced by performinga pumping test in the fault-zone is examined, in order to quantify mixing processes and contributionof different permeable domains to the flow. Reactive processes enhanced by the pumped fluxes are alsoidentified and discussed.The fault zone presents different geochemical responses related to changes in hydraulic regime. Theyare interpreted as different water sources related to various permeable structures within the aquifer.During the low water regime, results suggest mixing of recent water with a clear contribution of olderwater of inter-glacial origin (recharge temperature around 7 C), suggesting the involvement of watertrapped in a local low-permeability matrix domain or the contribution of large scale circulation loops.During the high water level period, due to inversion of the hydraulic gradient between the major permeablefault zone and its surrounding domains, modern water predominantly flows down to the deep bedrockand ensures recharge at a local scale within the graben.Pumping in a permeable fault zone induces hydraulic connections with storage-reservoirs. The overlaidregolith domain ensures part of the flow rate for long term pumping (around 20% in the present case).During late-time pumping, orthogonal fluxes coming from the fractured domains surrounding the majorfault zone are dominant. Storage in the connected fracture network within the graben structure mainlyensures the main part of the flow rate (80% in the present case). Reactive processes are induced by mixingof water from different sources and transfer conditions. A specific approach is applied to quantify thereaction rate involved along the pumping time. Autotrophic denitrification coupled with iron mineralsoxidation is highlighted and water rock interaction is clearly enhanced by the flux changes induced bypumping

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Hydrogeological properties of fractured rocks (granites, metasediments and volcanites) under the humid tropical climate of West Africa

Koïta

Jourde

2011

Advances in the Research of Aquatic Environment

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Well productivity controlling factors in crystalline terrains of southeastern Brazil

Cited by 41 publications

References 23 publications

The fracture permeability of Hard Rock Aquifers is due neither to tectonics, nor to unloading, but to weathering processes

The fracture permeability of Hard Rock Aquifers is due neither to tectonics, nor to unloading, but to weathering processes

Groundwater sources and geochemical processes in a crystalline fault aquifer

Hydrogeological properties of fractured rocks (granites, metasediments and volcanites) under the humid tropical climate of West Africa

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