A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach

Dewandel, Benoı̂t; Lachassagne, Patrick; Boudier, Françoise; Al-Hattali, Saïd; Ladouche, Bernard; Pinault, Jean-Louis; Al-Suleimani, Zaher

doi:10.1007/s10040-005-0449-2

Cited by 81 publications

(86 citation statements)

References 56 publications

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“…The dissolution of magnesium silicate minerals and the precipitation of carbonate phases may also be spurred by the energy released from the carbonation reaction itself via a "self-heating effect" [14,18]. A principal challenge of achieving the geological storage of CO 2 in ultramafic massifs, however, is the characteristic low porosity and permeability of these rocks [19]. To bind CO 2 as a solid within the magnesium silicate mineral matrix, open space and permeability must be created by fracturing the rock in the subsurface.…”

Section: Introductionmentioning

confidence: 99%

The Force of Crystallization and Fracture Propagation during In-Situ Carbonation of Peridotite

et al. 2017

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Subsurface mineralization of CO 2 by injection into (hydro-)fractured peridotites has been proposed as a carbon sequestration method. It is envisaged that the expansion in solid volume associated with the mineralization reaction leads to a build-up of stress, resulting in the opening of further fractures. We performed CO 2 -mineralization experiments on simulated fractures in peridotite materials under confined, hydrothermal conditions, to directly measure the induced stresses. Only one of these experiments resulted in the development of a stress, which was less than 5% of the theoretical maximum. We also performed one method control test in which we measured stress development during the hydration of MgO. Based on microstructural observations, as well as XRD and TGA measurements, we infer that, due to pore clogging and grain boundary healing at growing mineral interfaces, the transport of CO 2 , water and solutes into these sites inhibited reaction-related stress development. When grain boundary healing was impeded by the precipitation of silica, a small stress did develop. This implies that when applied to in-situ CO 2 -storage, the mineralization reaction will be limited by transport through clogged fractures, and proceed at a rate that is likely too slow for the process to accommodate the volumes of CO 2 expected for sequestration.

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Section: Introductionmentioning

confidence: 99%

The Force of Crystallization and Fracture Propagation during In-Situ Carbonation of Peridotite

et al. 2017

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“…The mean transit time or (MTT) the time a water molecule or solute spends traveling along subsurface flow pathways to the stream network is a fundamental hydraulic descriptor that provides useful information about water sources and mixing processes, potential flow pathways, and storage capabilities within a particular catchment control volume [McGuire et al, 2002;Dunn et al, 2007;Soulsby et al, 2009;Stewart et al, 2012;Sanghyun and Sungwon, 2014]. However, despite its relevance, mean transit time has been poorly investigated in continental serpentinization studies [Dewandel et al, 2005]. Detailed description of MTT coupled with geochemical data from alkaline seepage could provide a quantitative descriptor of water-rock contact time.…”

Section: Serpentinization and Hydrology: The Role Of A Tropical Envirmentioning

confidence: 99%

“…Based on the Mulligan and Burke [2005] regionalized hydrological model, recharge may represent 18% of the available precipitation, whereas runoff may reach as much as 21%. Dewandel et al [2003Dewandel et al [ , 2004Dewandel et al [ , 2005 studied the base flow response within a similar ultramafic formation in Oman. Although Oman is located in a subtropical arid region with precipitation amounts of approximately 250 mm/yr, the hydraulic peridotite properties may share strong similarities.…”

Section: Serpentinization and Hydrology: The Role Of A Tropical Envirmentioning

confidence: 99%

Geochemical evidence for active tropical serpentinization in the Santa Elena Ophiolite, Costa Rica: An analog of a humid early Earth?

Sánchez‐Murillo

Gazel

Schwarzenbach

et al. 2014

Geochem Geophys Geosyst

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Serpentinization is a planetary process that has important consequences on geochemical cycles, supporting microbial activity through the formation of H 2 and CH 4 and having the potential to sequester atmospheric CO 2 . We present geochemical evidence of active serpentinization in the Santa Elena Ophiolite, Costa Rica which is sustained by peridotites with a degree of serpentinization less than 50% with no evidence of an internal heat source. Average spring water temperatures are 29.

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“…Dewandel et al (2005) proposed that Moench's model for a dual-porosity media is consistent with most of the pumping tests in karst aquifers.…”

Section: Pumping and Lugeon Testsmentioning

confidence: 74%

Comparison of the results of pumping and tracer tests in a karst terrain

Nassimi¹,

Mohammadi²

2016

JCKS

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Pumping and tracer tests are commonly used to measure aquifer parameters such as hydraulic conductivity. Hydraulic conductivity is, however, difficult to characterize; especially in heterogeneous karst terrain. In this research, results of pumping and tracer tests are combined to determine hydraulic conductivities of the karst terrain at the Salman Farsi Dam Site. Pumping test data were analyzed by dual-porosity analytical models. The tracer tests were used to determine seepage velocities based on the assumption of Darcy's law, with calculated Reynolds numbers consistent with laminar flow. Geometric means of the hydraulic conductivities calculated from tracer tests were consistently higher than results derived from pumping tests. Movement of injected dye in a natural groundwater flow system is strongly controlled by preferential flow paths; therefore the estimated hydraulic conductivity is mainly affected by major dissolution openings. However, estimated hydraulic conductivity based on the pumping-test data is representative of the average hydraulic conductivity. In addition, Lugeon (or packer) tests were used to delineate the distribution of hydraulic conductivity within three boreholes.

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A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach

Cited by 81 publications

References 56 publications

The Force of Crystallization and Fracture Propagation during In-Situ Carbonation of Peridotite

The Force of Crystallization and Fracture Propagation during In-Situ Carbonation of Peridotite

Geochemical evidence for active tropical serpentinization in the Santa Elena Ophiolite, Costa Rica: An analog of a humid early Earth?

Comparison of the results of pumping and tracer tests in a karst terrain

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