CO2 data on gas and pore water sampled in situ in the Opalinus Clay at the Mont Terri rock laboratory

Vinsot, Agnès; Appelo, C.A.J.; Cailteau, C.; Wechner, Stefan; Pironon, Jacques; Donato, P. De; Cannière, P. De; Mettler, S.; Wersin, Paul; Gäbler, Hans-Eike

doi:10.1016/j.pce.2008.10.050

Cited by 48 publications

(53 citation statements)

References 11 publications

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“…During this phase, the test interval was purged twice with argon after 44 and 231 days. The most consistent set of data was obtained over 70 days after the second purge, when a uniform gas pressure along the whole gas circuit was obtained (Vinsot et al 2008). The continuous extraction of seepage water from the test interval had started just before the second purge and the chemical composition of seepage water has been analysed in two water samples before the end of the first year (Vinsot et al 2008).…”

Section: Tests Chronologymentioning

confidence: 82%

“…In borehole BPC-C1, the CO 2 concentration in the gas was lower by 0.5 log unit than those at equilibrium with the pore-water calculated from the measurements of pH, alkalinity, and total inorganic carbon and this discrepancy was not understood (Vinsot et al 2008). In borehole BHT-1, the CO 2 concentrations in the gas are very variable, unexpectedly low and far lower than those at equilibrium with the pore-water calculated from the measurements of pH, alkalinity, and total inorganic carbon .…”

Section: Natural Gas Contentmentioning

confidence: 85%

“…In spite of the low hydraulic conductivity value of the rock (below 3 9 10 -12 m/s), the difference in pressure between the interval and the rock induces a 3 to 20 mL/day water seepage flow rate from the rock to the interval (Vinsot et al 2008. The water seeping into the interval accumulates at the bottom due to gravity.…”

Section: Experimental Layoutmentioning

confidence: 99%

“…In the case of BPC-C1, an uncertainty subsisted regarding the origin of N 2 because the test interval of this borehole had been cored with N 2 (Vinsot et al 2008). In the case of borehole BHT-1, for which argon was used when coring, the increase of N 2 content in the circulating gas over time showed that this gas arises from pore-water.…”

Section: Natural Gas Contentmentioning

confidence: 99%

“…The method is based on gas circulation, at a pressure between 1 and 2 bar, in the packed off interval of a 15-m long ascending borehole (Vinsot et al 2008). This experiment, named pore-water chemistry (PC-C) gave a series of data on natural Opalinus Clay gases.…”

Section: Introductionmentioning

confidence: 99%

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Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)

Vinsot

Appelo²,

Lundy

et al. 2017

Swiss J Geosci

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Two experiments have been installed at Mont Terri in 2004 and 2009 that allowed gas circulation within a borehole at a pressure between 1 and 2 bar. These experiments made it possible to observe the natural gases that were initially dissolved in pore-water degassing into the borehole and to monitor their content evolution in the borehole over several years. They also allowed for inert (He, Ne) and reactive (H 2 ) gases to be injected into the borehole with the aim either to determine their diffusion properties into the rock pore-water or to evaluate their removal reaction kinetics. The natural gases identified were CO 2 , light alkanes, He, and more importantly N 2 . The natural concentration of four gases in Opalinus Clay porewater was evaluated at the experiment location: N 2 2.2 mmol/L ± 25%, CH 4 0.30 mmol/L ± 25%, C 2 H 6 0.023 mmol/L ± 25%, C 3 H 8 0.012 mmol/L ± 25%.Retention properties of methane, ethane, and propane were estimated. Ne injection tests helped to characterize rock diffusion properties regarding the dissolved inert gases. These experimental results are highly relevant towards evaluating how the fluid composition could possibly evolve in the drifts of a radioactive waste disposal facility.

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Section: Tests Chronologymentioning

confidence: 82%

Section: Natural Gas Contentmentioning

confidence: 85%

Section: Experimental Layoutmentioning

confidence: 99%

Section: Natural Gas Contentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)

Vinsot

Appelo²,

Lundy

et al. 2017

Swiss J Geosci

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Well integrity assessment under temperature and pressure stresses by a 1:1 scale wellbore experiment

Manceau

Trémosa

Audigane

et al. 2015

Water Resources Research

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A new in situ experiment is proposed for observing and understanding well integrity evolution, potentially due to changes that could occur during a well lifetime. The focus is put on temperature and pressure stresses. A small section of a well is reproduced at scale 1:1 in the Opalinus Clay formation, representative of a low permeable caprock formation (in Mont Terri Underground Rock Laboratory, Switzerland). The well-system behavior is characterized over time both by performing hydro-tests to quantify the hydraulic properties of the well and their evolution, and sampling the fluids to monitor the chemical composition and its changes. This paper presents the well integrity assessment under different imposed temperature (17-528C) and pressure (10-28 bar) conditions. The results obtained in this study confirm the ability of the chosen design and observation scale to estimate the evolution of the well integrity over time, the characteristics of the flow along the well-system and the reasons of the observed evolution. In particular, the estimated effective well permeability is higher than cement or caprock intrinsic permeability, which suggest preferential flow pathways at interfaces especially at the very beginning of the experiment; the significant variations of the effective well permeability observed after setting pressure and temperature stresses indicate that operations could influence well integrity in similar proportions than the cementing process.

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Development of quantitative detection method for mass spectrometry coupled to an infrared laser spectroscope (Picarro) to monitor in nitrogen matrix a complex gas mixture of H₂, He, CO, N₂, Ne, O₂, Ar, CO₂, H₂S, CH₄, C₂H₄, C₂H₆, C₃H₆, C₃H₈, i‐C₄H₁₀, n‐C₄H₁₀, and C₅H₁₂

Keita¹,

Noirez

Berthe

et al. 2023

Rapid Comm Mass Spectrometry

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RationaleThe deep geological repository is considered the international reference for radioactive waste management. All gas exchanges must be understood in the context of the feasibility of such a repository. The technological challenge is to continuously monitor a wide range of gaseous molecules at low concentrations in confined spaces.MethodsA gas monitoring station, composed of two complementary analyzers, was developed: an electron impact quadrupole mass spectrometer (HPR‐20 R&D Hiden Analytical) and an infrared laser spectroscope (Picarro). The spectrometer was calibrated using simple mixtures (i.e., C2H6 in N2) and multiple mixtures (i.e., H2, He, CO2, CH4, and O2 in N2) at different concentrations to correct interferences. A matrix calculation is proposed to calculate the relative concentrations.ResultsThe method developed allows the measurement of gaseous species: light hydrocarbons, noble gases, sulfides, greenhouse gases, oxygen, hydrogen, and nitrogen in the same mixture. For each gas, the SDs and the limits of detection and quantification were calculated. The method was validated by comparing the concentrations of the measured gas species with the reference values of two standard gas cylinders.ConclusionsCalibration of a complex gas mixture remains a challenge because fragmentation of molecules, especially hydrocarbons, reduces the sensitivity of the method. The method developed is suitable for continuous gas monitoring in a confined environment and can be implemented to perform experiments in underground structures: galleries, microtunnels (cells), and boreholes.

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CO2 data on gas and pore water sampled in situ in the Opalinus Clay at the Mont Terri rock laboratory

Cited by 48 publications

References 11 publications

Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)

Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)

Well integrity assessment under temperature and pressure stresses by a 1:1 scale wellbore experiment

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CO2 data on gas and pore water sampled in situ in the Opalinus Clay at the Mont Terri rock laboratory

Cited by 48 publications

References 11 publications

Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)

Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)

Well integrity assessment under temperature and pressure stresses by a 1:1 scale wellbore experiment

Development of quantitative detection method for mass spectrometry coupled to an infrared laser spectroscope (Picarro) to monitor in nitrogen matrix a complex gas mixture of H2, He, CO, N2, Ne, O2, Ar, CO2, H2S, CH4, C2H4, C2H6, C3H6, C3H8, i‐C4H10, n‐C4H10, and C5H12

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