Modelling the porewater chemistry of the Callovian–Oxfordian formation at a regional scale

Gaucher, Éric C.; Blanc, Philippe; Bardot, F.; Braibant, Gilles; Buschaert, Stéphane; Crouzet, Catherine; Gautier, Anne; Girard, Jean‐Pierre; Jacquot, Emmanuel; Lassin, Arnault; Negrel, Gabrielle; Tournassat, Christophe; Vinsot, Agnès; Altmann, Scott

doi:10.1016/j.crte.2006.06.002

Cited by 140 publications

(116 citation statements)

References 20 publications

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“…However, the geochemical system is less known and more complicated on the pore scale. Clayrocks have been chosen by many countries for long-term storage of radioactive waste primarily due to its favorable pore water geochemical environment (Gaucher et al, 2006(Gaucher et al, , 2009. Some significant characteristics of the pore water composition in clay-rocks are identified from studies similar to clay-rich caprock for nuclear storage purposes.…”

Section: Discussion On Pore Water Chemistry Of Clayrockmentioning

confidence: 99%

CO2–brine–caprock interaction: Reactivity experiments on Eau Claire shale and a review of relevant literature

Liu

Lü

Griffith

et al. 2012

International Journal of Greenhouse Gas Control

199

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a b s t r a c tLong term containment of stored CO 2 in deep geological reservoirs will depend on the performance of the caprock to prevent the buoyant CO 2 from escaping to shallow drinking water aquifers or the ground surface. Here we report new laboratory experiments on CO 2 -brine-caprock interactions and a review of the relevant literature.The Eau Claire Formation is the caprock overlying the Mount Simon sandstone formation, one of the target geological CO 2 storage reservoirs in the Midwest USA region. Batch experiments of Eau Claire shale dissolution in brine were conducted at 200• C and 300 bars to test the extent of fluid-rock reactions. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis indicate minor dissolution of K-feldspar and anhydrite, and precipitation of pore-filling and pore-bridging illite and/or smectite, and siderite in the vicinity of pyrite.We also reviewed relevant reactivity experiments, modeling work, and field observations in the literature in an attempt to help define the framework for future studies on the geochemical systems of the caprock overlain on geological CO 2 storage formations. Reactivity of the caprock is generally shown to be low and limited to the vicinity of the CO 2 -caprock interface, and is related to the original caprock mineralogical and petrophysical properties. Stable isotope studies indicate that CO 2 exists in both free phase and dissolved phase within the caprock. Carbonate and feldspar dissolution is reported in most studies, along with clay and secondary carbonate precipitation. Currently, research is mainly focused on the micro-fracture scale geochemistry of the shaly caprock. More attention is required on the potential pore scale reactions that may become significant given the long time scale associated with geological carbon storage.

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Section: Discussion On Pore Water Chemistry Of Clayrockmentioning

confidence: 99%

CO2–brine–caprock interaction: Reactivity experiments on Eau Claire shale and a review of relevant literature

Liu

Lü

Griffith

et al. 2012

International Journal of Greenhouse Gas Control

199

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“…Model phases were prepared in the Ca-(Ca-SM), Na-(Na-SM) and "Na"-(Na-ILL) forms. In addition to the two model phases, MX-80 bentonite (MX- (Gaucher et al 2006). …”

Section: Methodsmentioning

confidence: 99%

Porosities accessible to HTO and iodide on water-saturated compacted clay materials and relation with the forms of water: A low field proton NMR study

Montavon

Guo

Tournassat

et al. 2009

Geochimica et Cosmochimica Acta

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. Porosities accessible to HTO and iodide on water-saturated compacted clay materials and relation with the forms of water: A low field proton NMR study. Geochimica et Cosmochimica Acta, Elsevier, 2009, 73 (24) AbstractThe aim of the present work was to quantify accessible porosities for iodide and for a water tracer (HTO) on water-saturated compacted clay samples (illite, montmorillonite and MX-80 bentonite) and to relate these macroscopic values to the forms of water in these porosities (surface/bulk water, external/internal water). Low field proton NMR was used to characterize and quantify the forms of water. This enabled the three different populations (structural OH, external surface and internal surface water) to be differentiated on hydrated clays by considering the difference in proton mobility. An accurate description of the water forms within the different populations did not appear possible when water molecules of these populations were in contact because of the occurrence of rapid exchange reactions. For this 2 reason, it was not possible to use the low resolution NMR method to quantify external surface and bulk water in fully water-saturated compacted clay media at room temperature. This latter information could however be estimated when analyzing the samples at -25°C. At this temperature, a distinction based on the difference in mobility could be made since surface water remained in a semi-liquid state whereas bulk water froze. In parallel, accessible porosities for anions and HTO were determined by an isotopic dilution method using capillaries to confine the materials. HTO was shown to probe the whole pore volume (i.e. the space made of surface and bulk water). When the surface water volume was mainly composed of interlayer water (case of montmorillonite and bentonite), iodide was shown to be located in the pore space made of bulk water. When the interlayer water was not present (case of illite), the results showed that iodide could access a small fraction of the surface water volume localized at the external surface of the clay particles.

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“…After verification, these two values were due to the presence of gypsum that dissolved during sample leaching; consequently the C leached,SO4 measured in these two samples cannot be considered as representative of the C poro,SO4 , although C leached,SO4 were correlated with solid/liquid ratios. In the lower part of the Tégulines Clay, the C poro,SO4 deduced from leaching of samples conditioned in liquid nitrogen was lower than 10 mmol/L PW, whereas C poro,SO4 deduced from leaching of samples conditioned in aluminum bags were systematically higher (9-30 mmol/L PW), confirming the importance of the sample conditioning [46,47]. These values were not further discussed.…”

Section: 2mentioning

confidence: 52%

A Deep Alteration and Oxidation Profile in a Shallow Clay Aquitard: Example of the Tégulines Clay, East Paris Basin, France

Lerouge

Robinet²,

Debure

et al. 2018

Geofluids

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The oxidation profile of a surficial clay aquitard was studied on a 35-meter borecore from the Albian Tégulines Clay near Brienne-leChâteau (Paris Basin, France). Mineralogical, geochemical, and petrophysical data showed evidences of gradual oxidation taking place down to a depth of 20 m. Below 20 m, the clay material was nonplastic and nonfractured, and it inherited reduced redox conditions from bacterial sulfate reduction that occurred after sediment deposition. Above 20 m, the clay material was plastic. Up to a depth of 10-11 m, only rare yellowish aggregates of glauconite attested to limited oxidation, and pore water chemistry was unmodified. The 5-11 m depth interval was characterized by intensive pyrite oxidation, calcite dissolution, and formation of sulfate and iron hydroxide minerals. The upper 2-3 m was ochrous and entirely oxidized. These mineralogical changes were mirrored with pore water chemistry modifications such as an increase of alkalinity and sulfate concentration in the upper part of the profile. The presence of siderite at ∼11 m evinced the reactivity of Fe(II) in the structure of clay minerals with dioxygen from meteoric waters that infiltrated into the Tégulines Clay through vertical fractures.

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Modelling the porewater chemistry of the Callovian–Oxfordian formation at a regional scale

Cited by 140 publications

References 20 publications

CO2–brine–caprock interaction: Reactivity experiments on Eau Claire shale and a review of relevant literature

CO2–brine–caprock interaction: Reactivity experiments on Eau Claire shale and a review of relevant literature

Porosities accessible to HTO and iodide on water-saturated compacted clay materials and relation with the forms of water: A low field proton NMR study

A Deep Alteration and Oxidation Profile in a Shallow Clay Aquitard: Example of the Tégulines Clay, East Paris Basin, France

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