CO2 rock physics as part of the Weyburn-Midale geological storage project

Njiekak, Gautier; Schmitt, Douglas R.; Yam, Helen; Kofman, R.

doi:10.1016/j.ijggc.2013.02.007

Cited by 41 publications

(27 citation statements)

References 18 publications

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“…Figure a and b shows wiggle‐trace plots corresponding to the change in V p and V s of Corvio sandstone for 5 MPa steps, following the display used by Njiekak et al . (). We observe that, when increasing confining pressure, both velocities increase from 2.92 to 3.69 km s −1 and 1.51 to 2.09 km s −1 , respectively.…”

Section: Resultsmentioning

confidence: 97%

“…V p and V s velocities were axially measured on 50 mm diameter X-plugs following a loading/unloading path from 0.5 to 35 MPa; the pressure steps were 2.5 and 5 MPa for nonhydrostatic and hydrostatic conditions, respectively. Figure 7a and b shows wiggle-trace plots corresponding to the change in V p and V s of Corvio sandstone for 5 MPa steps, following the display used by Njiekak et al (2013). We observe that, when increasing confining pressure, both velocities increase from 2.92 to 3.69 km s −1 and 1.51 to 2.09 km s −1 , respectively.…”

Section: P-and S-wave Velocitiesmentioning

confidence: 82%

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Characterisation and multifaceted anisotropy assessment of Corvio sandstone for geological CO₂ storage studies

Falcón-Suarez

Canal-Vila

Martín

et al. 2016

Geophysical Prospecting

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We present a comprehensive characterization of the physical, mineralogical, geomechanical, geophysical and hydrodynamic properties of Corvio sandstone. This information, together with a detailed assessment of anisotropy, is needed to establish Corvio sandstone as a useful laboratory rock-testing standard for wellconstrained studies of thermo-hydro-mechanical-geochemical coupled phenomena associated with CO 2 storage practices and for geological reservoir studies in general. More than 200 core plugs of Corvio sandstone (38.1 and 50 mm diameter, 2:1 length to diameter ratio) were used in this characterization study, with a rock porosity of 21.7 ± 1.2%, dry density 2036 ± 32 kg m -3, and unconfined compressive and tensile strengths of 41 ± 3.28 and 2.3 ± 0.14 MPa, respectively. Geomechanical tests show that the rock behaves elastically between ~10 and ~18 MPa under unconfined conditions with associated Young's modulus and Poisson's ratio of 11.8 ± 2.8 GPa and 0.34 ± 0.01, respectively. Permeability decreases abruptly with confining pressure up to ~10 MPa and then stabilizes at ~1 mD. Ultrasonic P-and Swave velocities vary from about 2.8 to 3.8 km s -1 and 1.5 to 2.4 km s -1 , respectively, over confining and differential pressures between 0.1 -35 MPa, allowing derivation of associated dynamic elastic moduli. Anisotropy was investigated using oriented core plugs for electrical resistivity, elastic wave velocity and attenuation, permeability and tracer injection tests. Corvio sandstone shows weak transverse isotropy (symmetry axis normal to bedding) of <10% for velocity and <20% for attenuation.

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Section: Resultsmentioning

confidence: 97%

Section: P-and S-wave Velocitiesmentioning

confidence: 82%

Characterisation and multifaceted anisotropy assessment of Corvio sandstone for geological CO₂ storage studies

Falcón-Suarez

Canal-Vila

Martín

et al. 2016

Geophysical Prospecting

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“…With the exception of the work of Njiekak et al (2013) focused on carbonate lithologies, most of the above mentioned studies focused on the effects of fluid substitution and partial saturation on the CO 2 /pore fluid/rock system. As such, interpretation of the experimental data is complicated by the uncertainty in accurately determining the rock's saturation state and in assessing its consequences on the measured velocities.…”

Section: Introductionmentioning

confidence: 99%

Effects of water and supercritical CO2 on the mechanical and elastic properties of Berea sandstone

Piane

Sarout

2016

International Journal of Greenhouse Gas Control

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“…Adam and Otheim (2013) experimentally measure bulk and shear moduli dispersion of basalts saturated with water and liquid CO 2 at seismic frequencies. Njiekak et al (2013) report results of comprehensive study of scCO 2 saturated samples from Weyburn-Midale geologic project. Siggins et al (2010) performs the first measurements on reservoir samples from the CRC-1 well in the Otway Basin, Australia.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of acoustic responses on the injection of supercritical CO2 into sandstones from the Otway Basin

et al. 2013

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Quantitative knowledge of the acoustic response of rock from an injection site on supercritical CO 2 (scCO 2 ) saturation is crucial for understanding the feasibility of time-lapse seismic monitoring of CO 2 plume migration. A suite of shaley sandstones from the injection interval of the CRC-2 well, Otway Basin, Australia is tested to reveal the effects of supercritical CO 2 injection on acoustic responses. CO 2 is first injected into dry samples, flushed out with brine and then injected again into brine-saturated samples. Such a suite of experiments allows us to obtain acoustic velocities of the samples for a wide range of CO 2 /brine saturations from 0% to 100%. On injection of scCO 2 into brine-saturated samples, the rocks exhibit a decrease of compressional velocities by about 7% with the increase of CO 2 saturation from 0% to a maximum of about 50%. Anisotropy of the shaley sandstones from the Otway Basin must be taken into account as the difference in the velocities normal and parallel to bedding is comparable with the perturbation due to CO 2 injection and the samples of different orientations exhibit transition from Gassmann-Hill to Gassmann-Wood bound at different scCO 2 saturations. Changes of the dry samples before and after the CO 2 injection (if any) are not traceable by acoustic methods.

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CO2 rock physics as part of the Weyburn-Midale geological storage project

Cited by 41 publications

References 18 publications

Characterisation and multifaceted anisotropy assessment of Corvio sandstone for geological CO₂ storage studies

Characterisation and multifaceted anisotropy assessment of Corvio sandstone for geological CO₂ storage studies

Effects of water and supercritical CO2 on the mechanical and elastic properties of Berea sandstone

An experimental study of acoustic responses on the injection of supercritical CO2 into sandstones from the Otway Basin

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CO2 rock physics as part of the Weyburn-Midale geological storage project

Cited by 41 publications

References 18 publications

Characterisation and multifaceted anisotropy assessment of Corvio sandstone for geological CO2 storage studies

Characterisation and multifaceted anisotropy assessment of Corvio sandstone for geological CO2 storage studies

Effects of water and supercritical CO2 on the mechanical and elastic properties of Berea sandstone

An experimental study of acoustic responses on the injection of supercritical CO2 into sandstones from the Otway Basin

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Characterisation and multifaceted anisotropy assessment of Corvio sandstone for geological CO₂ storage studies

Characterisation and multifaceted anisotropy assessment of Corvio sandstone for geological CO₂ storage studies