Unified water isotherms for clayey porous materials

Revil, A.; Lu, Ning

doi:10.1002/wrcr.20426

Cited by 108 publications

(47 citation statements)

References 34 publications

(69 reference statements)

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“…The lower saturation limit corresponds to RH ¼ 0.336AE 0.003 for which we used an MgCl desiccant at 25°C. This low RH implies that the saturation corresponds approximately to a monolayer of water covering the surface of the minerals Revil and Lu, 2013). The first sample was pressurized at 10.34 MPa for a period of 72 h, and it was left to equilibrate within a saturated jacket for an additional 120 days (flooded with a drained, saturated pore line P p ¼ 0 Pa).…”

Section: Samplementioning

confidence: 97%

Laboratory determination of the complex conductivity tensor of unconventional anisotropic shales

2014

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We developed a four-electrode acquisition system to measure the complex conductivity tensor of tight and anisotropic shale cores using an accurate impedance meter. The complex conductivity tensor was obtained by inverting complex electrical potential data (amplitude and phase) acquired over a distributed array of electrodes. Inversion of the acquired data was performed with a Markov chain Monte Carlo (McMC) sampler that can explicitly take into account the nonuniqueness of the inverse problem. This approach was validated with direct measurements of impedance tensor eigenvalues with a single-component measurement technique. Consistent results were obtained using these two methods validating those obtained through the McMC sampling strategy. Both the in-phase and quadrature conductivities were anisotropic with the same anisotropic ratio in agreement with a recently developed petrophysical model based on volume averaging. The type of anisotropy of the Bakken and Haynesville core samples was found to be transverse isotropic, with the anisotropic ratio on the order of 10. In-phase conductivity was found to be independent of frequency up to 100 Hz, while the magnitude of the quadrature conductivity increased with frequency in the range from 0.1 to 45 kHz. Both components were sensitive to water saturation. Surface conductivity could be reliably predicted from the quadrature conductivity in agreement with the model prediction. The relationship between surface and quadrature conductivities was independent on saturation and anisotropy.

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Section: Samplementioning

confidence: 97%

Laboratory determination of the complex conductivity tensor of unconventional anisotropic shales

2014

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“…There have been a few attempts to quantify water sorption hysteresis for both soil samples and source clay minerals. For example, film flow hysteresis was included when Revil and Lu () developed a unified CEC‐normalized water vapour sorption isotherm model for porous clayey materials. Also, we previously suggested a single parameter non‐singularity model to account for sorption hysteresis in 21 Arizona soils (Arthur et al, ).…”

Section: Introductionmentioning

confidence: 99%

Clay content and mineralogy, organic carbon and cation exchange capacity affect water vapour sorption hysteresis of soil

Arthur

Tuller

Møldrup

et al. 2019

European J Soil Science

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The hysteretic behaviour of the dry region (<−1.5 MPa) of the soil water characteristic, which is of the essence for accurate characterization and modelling of bio‐physicochemical soil processes under dry conditions, is well documented. However, knowledge about how to best quantify water vapour sorption hysteresis and about the effects of soil properties on dry‐region hysteretic behaviour is limited. To overcome this knowledge gap, we proposed a new method for quantifying sorption hysteresis and evaluated its applicability based on measured sorption isotherms of four source clay minerals and 147 soil samples. Furthermore, the effects of clay mineralogy, clay content, soil organic carbon (SOC) and cation exchange capacity (CEC) on the magnitude of sorption hysteresis were investigated. For the clay minerals, kaolinite did not exhibit hysteretic behaviour, illite showed some hysteresis, whereas Na‐ and Ca‐smectite exhibited strong hysteretic behaviour. The average hysteresis, corrected for clay and SOC contents, was strongly reflective of the dominant clay mineralogy of the soil samples. For the soil samples with low SOC content, the average hysteresis significantly increased with increasing clay content (R2 = 0.92), except for the kaolinite‐rich samples (R2 = 0.35). The SOC‐rich samples that exhibited illitic clay mineralogy and similar soil texture showed a significant increase in average hysteresis with increasing organic carbon content (R2 = 0.93). For all soil samples combined, the CEC was the strongest indicator for the magnitude of water vapour sorption hysteresis. Highlights A new index for quantification of soil vapour sorption hysteresis was proposed Large SOC and clay content increased sorption hysteresis For soil samples, dominant clay mineralogy controlled the magnitude of hysteresis Cation exchange capacity was the best predictor of hysteresis for all soil types

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“…Revil and Lu,18). By only considering capillary effects, the suction s exerted when desaturating 32 nm diameter pores is given by the Young-Laplace equation: (1) in which  w/a is the water/air interfacial tension equal to COx claystone, confirming the predominance of capillary effects in the clay water interaction in these inter-platelets pores schematically represented in Figure 3.…”

Section: Discussionmentioning

confidence: 78%

Stress release and suction generation in the Callovo-Oxfordian claystone

et al. 2016

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Abstract. Stress release effects in a specimen of claystone extracted at great depth (465 m) in the layer of the Callovo-Oxfordian claystone in Eastern France is examined by mimicking the stress change during extraction in the oedometer. To do so, a specimen first submitted to hydration with swelling impeded is afterwards unloaded at constant water content. Comparable mercury intrusion pore size distribution curves are obtained before and after stress release, showing little change in the configuration of inter-platelets pores within the clay matrix of the claystone. The swelling observed at constant water content is then related, to a water transfer from inter-platelets pores to intra-platelets pores, resulting in crystalline swelling within the smectite fraction of the inter-layer illitesmectite minerals.

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Unified water isotherms for clayey porous materials

Cited by 108 publications

References 34 publications

Laboratory determination of the complex conductivity tensor of unconventional anisotropic shales

Laboratory determination of the complex conductivity tensor of unconventional anisotropic shales

Clay content and mineralogy, organic carbon and cation exchange capacity affect water vapour sorption hysteresis of soil

Stress release and suction generation in the Callovo-Oxfordian claystone

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