Clay minerals related to the hydrothermal activity of the Bouillante geothermal field (Guadeloupe)

Mas, Amédée; Guisseau, Delphine; Mas, Patricia Patrier; Beaufort, Daniel; Genter, Albert; Sanjuan, Bernard; Girard, Jean‐Pierre

doi:10.1016/j.jvolgeores.2006.07.010

Cited by 71 publications

(44 citation statements)

References 42 publications

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“…This pattern of hydrothermal alteration represents the commonly observed pattern of alteration observed in high-temperature geothermal systems hosted in andesite rocks [28]. Similar patterns of hydrothermal alteration are reported in the geologically similar neighbouring island of Guadeloupe [29,30]. This pattern of alteration is also used to interpret the resistivity anomalies associated with high temperature geothermal systems [15,31].…”

Section: Variations In Seismic Velocity With Depth and Temperature Atsupporting

confidence: 77%

Seismic Velocity/Temperature Correlations and a Possible New Geothermometer: Insights from Exploration of a High-Temperature Geothermal System on Montserrat, West Indies

Ryan

Shalev

2014

Energies

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Abstract:In 2013, two production wells were drilled into a geothermal reservoir on Montserrat, W.I. (West Indies) Drilling results confirmed the main features of a previously developed conceptual model. The results confirm that below ~220 °C there is a negative correlation between reservoir temperature and seismic velocity anomaly. However, above ~220 °C there is a positive correlation. We hypothesise that anomalous variations in seismic velocity within the reservoir are controlled to first order by the hydrothermal mineral assemblage. This study suggests a new geophysical thermometer which can be used to estimate temperatures in three dimensions with unprecedented resolution and to indicate the subsurface fluid pathways which are the target of geothermal exploitation.

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Section: Variations In Seismic Velocity With Depth and Temperature Atsupporting

confidence: 77%

Seismic Velocity/Temperature Correlations and a Possible New Geothermometer: Insights from Exploration of a High-Temperature Geothermal System on Montserrat, West Indies

Ryan

Shalev

2014

Energies

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“…The increasing demand for energy and a desire to increase energy autonomy in the Lesser Antilles (French West Indies) have resulted in a number of BRGM geothermal research projects focused on the islands of Guadeloupe (Traineau et al, 1997;Correia et al, 2000;Sanjuan et al, 2001;Fabriol et al, 2005;Mas et al, 2006) and Martinique (Sanjuan et al, 2002a(Sanjuan et al, , 2002bGenter et al, 2002;Sanjuan et al, 2005) over the past decade.…”

Section: Introductionmentioning

confidence: 99%

Lithium isotopes in island arc geothermal systems: Guadeloupe, Martinique (French West Indies) and experimental approach

Millot

Scaillet

Sanjuan

2010

Geochimica et Cosmochimica Acta

109

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. Lithium isotopes in island arc geothermal systems: Guadeloupe, Martinique (French West Indies) and experimental approach. Geochimica et Cosmochimica Acta, Elsevier, 2010, 74 (6) AbstractWe report Li isotopic measurements in seawater derived waters discharged from geothermal wells, thermal and submarine springs located in volcanic island arc areas in Guadeloupe (the Bouillante geothermal field) and Martinique (Lamentin plain and the Diamant areas). The lithium isotopic signatures of the geothermal fluids collected from deep reservoirs are homogeneous for a given site.However, the δ 7 Li signatures of each of these reservoirs are significantly different. We provide the first low temperature (25-250°C) experiments of Li isotope exchange during seawater/basalt interaction), which confirm that Li isotopic exchange is strongly temperature dependent, as previously inferred from natural studies. Li isotopic fractionation ranges from +19.4‰ (Δ solution -solid ) at 25°C to +6.7‰ at 250°C.The experiments also evidence the importance of Li isotopic fractionation during formation of Libearing secondary minerals by the uptake of lithium into the alteration minerals. Application of experimental results to the Bouillante area suggests that the geothermal water is in equilibrium at 250-260°C with a deep and large reservoir located in the transition zone possibly at the contact between volcanic flows and basaltic dikes. For the Lamentin and Diamant areas, the geothermal fluid appear to be partially in equilibrium at 90-120°C and 180°C, respectively, with reservoir sedimentary rocks. Our study highlights that lithium isotopic systematics is a powerful tool for the characterization of the origin of geothermal waters as well as the nature of their reservoir rocks.

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“…However, this original permeability has been completely obliterated. Exhaustive analysis of clay minerals from wells BO-5 (Figure 7), BO-6 and BO-7 (Mas, Guisseau et al 2006;Guisseau, Patrier Mas et al 2007) and from surface samples (Patrier, Beaufort et al 2003) shows that this obliteration can be explained by self sealing processes related to the alteration by circulation of hydrothermal fluids (smectite type clays down to about 250 m depth, partially replaced by kaolinite from 150 m down and, lower down, interbedded illite smectite). As the geological formations that had significant original permeability are at shallow depth within this particularly clogged zone, the geothermal system no longer comprises formations with a significant matrix or fissure permeability.…”

Section: Roles Of Fractures In the Hydrodynamic Properties Of The Geomentioning

confidence: 99%

“…The waters collected from hot springs, which are NaCl fluids and whose salinity is higher than 1 g/l (submarine springs, "Thomas, Cave BO-2, Bord de Mer and the neighbouring drillhole BO-BS drilled since 1999, Tuyau, Marsolle" springs - Figure 4), are a mixture in variable proportions of surface waters (fresh and/or sea water), and the deep geothermal fluid (Sanjuan, Lasne et al, 2001). The other thermal waters (Na-HCO 3 fluids with a salinity < 1 g/l) such as those collected from the springs "Bain du Curé, Lise or River Bouillante" (Figure 4) are only surface fresh waters heated by conduction (Mas, Guisseau et al 2006). …”

Section: Composition and Origin Of The Geothermal Fluidmentioning

confidence: 99%

Hydrogeological model of a high-energy geothermal field (Bouillante area, Guadeloupe, French West Indies)

Lachassagne¹,

Maréchal²,

Sanjuan

2009

Hydrogeol J

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The Bouillante geothermal field presently provides about 8% of the annual electricity needs of the French West Indies island of Guadeloupe. It has been the subject of a large number of studies covering various disciplines. These results enable the proposal of a hydrogeological conceptual model of the field. The reservoir consists of two perpendicular sets of fractures and faults, related to major regional tectonic structures. The capacitive and transmissive functions of the field are assured by these deep faults and fractures, which have been clogged near surface by self sealing and clay fill phenomena. The heat exchanges of the reservoir with the outside are thus reduced, through thermal and moreover hydraulic blanketing, to conductive transfers. Convection cells are active within the reservoir, ensuring its thermal and geochemical homogeneity. Heat exchange with the magmatic chamber is only conductive. The Na-Cl geothermal fluid in the reservoir is composed of about 60% sea water and 40% fresh water of meteoric origin and has reached a chemical equilibrium with a mineralogical assemblage at 250-260°C. This equilibrium state, the absence of tritium in solution, the low ratio between water in and out fluxes and the large reservoir volume (estimated at more than 30 millions m 3 using tracer tests) suggest a relatively long (>> 100 years) residence time of the geothermal fluid in the reservoir. Three main factors, all essential, explain the existence and location of the Bouillante geothermal field: a heat source (cooling hypovolcanic intrusion), a network of permeable fractures at the origin of the geothermal aquifer, and an impermeable surface cover, limiting the loss of energy and ensuring the durability of the field.

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Clay minerals related to the hydrothermal activity of the Bouillante geothermal field (Guadeloupe)

Cited by 71 publications

References 42 publications

Seismic Velocity/Temperature Correlations and a Possible New Geothermometer: Insights from Exploration of a High-Temperature Geothermal System on Montserrat, West Indies

Seismic Velocity/Temperature Correlations and a Possible New Geothermometer: Insights from Exploration of a High-Temperature Geothermal System on Montserrat, West Indies

Lithium isotopes in island arc geothermal systems: Guadeloupe, Martinique (French West Indies) and experimental approach

Hydrogeological model of a high-energy geothermal field (Bouillante area, Guadeloupe, French West Indies)

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