Aquifer disposal of CO2-rich greenhouse gases: Extension of the time scale of experiment for CO2-sequestering reactions by geochemical modelling

Gunter, William D.; Wiwehar, B.; Perkins, E.H.

doi:10.1007/bf01163065

Cited by 399 publications

(260 citation statements)

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“…The overall data of the total rock composition of before and after SC CO 2 -brine exposure do not show important precipitation/dissolution of mineral phases. We can conclude that the reactions between minerals and fluids were not significant (Gunter et al, 1997;Hitchon, 1996), and the changes in the porosity configuration measured (Table 1) are limited to external areas of the sandstone blocks exposed to CO 2 -rich brine and probably due to local chemical changes; and may represent the early physical display of the chemical influence of the CO 2 -rich brine on the rock.…”

Section: Discussionmentioning

confidence: 99%

Qualitative and quantitative changes in detrital reservoir rocks caused by CO2–brine–rock interactions during first injection phases (Utrillas sandstones, northern Spain)

2016

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Abstract. The aim of this article is to describe and interpret qualitative and quantitative changes at rock matrix scale of lower-upper Cretaceous sandstones exposed to supercritical (SC) CO 2 and brine. The effects of experimental injection of CO 2 -rich brine during the first injection phases were studied at rock matrix scale, in a potential deep sedimentary reservoir in northern Spain (Utrillas unit, at the base of the Cenozoic Duero Basin).Experimental CO 2 -rich brine was exposed to sandstone in a reactor chamber under realistic conditions of deep saline formations (P ≈ 7.8 MPa, T ≈ 38 • C and 24 h exposure time). After the experiment, exposed and non-exposed equivalent sample sets were compared with the aim of assessing possible changes due to the effect of the CO 2 -rich brine exposure. Optical microscopy (OpM) and scanning electron microscopy (SEM) aided by optical image analysis (OIA) were used to compare the rock samples and get qualitative and quantitative information about mineralogy, texture and pore network distribution. Complementary chemical analyses were performed to refine the mineralogical information and to obtain whole rock geochemical data. Brine composition was also analyzed before and after the experiment.The petrographic study of contiguous sandstone samples (more external area of sample blocks) before and after CO 2 -rich brine injection indicates an evolution of the pore network (porosity increase ≈ 2 %). It is probable that these measured pore changes could be due to intergranular quartz matrix detachment and partial removal from the rock sample, considering them as the early features produced by the CO 2 -rich brine. Nevertheless, the whole rock and brine chemical analyses after interaction with CO 2 -rich brine do not present important changes in the mineralogical and chemical configuration of the rock with respect to initial conditions, ruling out relevant precipitation or dissolution at these early stages to rock-block scale. These results, simulating the CO 2 injection near the injection well during the first phases (24 h) indicate that, in this environment where CO 2 enriches the brine, the mixture principally generates local mineralogical/textural readjustments on the external area of the samples studied.The application of OpM, SEM and optical image analysis have allowed an exhaustive characterization of the sandstones studied. The procedure followed, the porosity characterization and the chemical analysis allowed a preliminary approximation of the CO 2 -brine-rock interactions and could be applied to similar experimental injection tests.

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Section: Discussionmentioning

confidence: 99%

Qualitative and quantitative changes in detrital reservoir rocks caused by CO2–brine–rock interactions during first injection phases (Utrillas sandstones, northern Spain)

2016

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“…Exploratory studies of geochemical effects have also been conducted, using a zerodimensional batch reaction approach to model the chemical reactions that would take place when different mineral assemblages are exposed to CO 2 at high pressures in the presence of brine (Perkins and Gunter, 1996;Gunter et al, 1997;Xu et al, 2004a). The present study combines the simple 1-D radial model previously investigated by Pruess et al (2003) with the batch chemical reaction model of Xu et al (2004a), to model the coupled processes of fluid flow and chemical reactions near a CO 2 injection well.…”

Section: Definition Of Test Problemmentioning

confidence: 99%

TOUGHREACT User's Guide: A Simulation Program for Non-isothermal Multiphase Reactive Geochemical Transport in Variably Saturated Geologic Media, V1.2.1

Xu¹,

Sonnenthal²,

Spycher³

et al. 2008

197

359

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“…As CO2 is injected into shale reservoirs, it dissolves into waters or brines and changes the acidbase equilibrium which triggers the dissolution and precipitation of minerals [5,6]. Ketzer et al [7] observed the dissolution of feldspars and calcite cement and the precipitation of dickite, opal and calcite, and reported that the dissolution of Ca and Fe cations limited the precipitation of carbonate.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mechanical Properties of Black Shales after CO2-Water-Rock Interaction

Lyu¹,

Ranjith²,

Long³

et al. 2016

Preprint

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Abstract:The effects of CO2-water-rock interactions on the mechanical properties of shale are essential for estimating the possibility of sequestrating CO2 in shale reservoirs. In this study, uniaxial compressive strength (UCS) tests together with an acoustic emission (AE) system and SEM and EDS analysis were performed to investigate the mechanical properties and microstructural changes of black shales with different saturation times (10 days, 20 days and 30 days) in water dissoluted with gaseous/super-critical CO2. According to the experimental results, the values of UCS, Young's modulus and brittleness index decrease gradually with increasing saturation time in water with gaseous/super-critical CO2. Compared to samples without saturation, 30-day saturation causes reductions of 56.43% in UCS and 54.21% in Young's modulus for gaseous saturated samples, and 66.05% in UCS and 56.32% in Young's modulus for super-critical saturated samples, respectively. The brittleness index also decreases drastically from 84.3% for samples without saturation to 50.9% for samples saturated in water with gaseous CO2, to 47.9% for samples saturated in water with super-critical carbon dioxide (SC-CO2). SC-CO2 causes a greater reduction of shale's mechanical properties. The crack propagation results obtained from the AE system show that longer saturation time produces higher peak cumulative AE energy. SEM images show that many pores occur when shale samples are saturated in water with gaseous /super-critical CO2. The EDS results show that CO2-water-rock interactions increase the percentages of C and Fe and decrease the percentages of Al and K on the surface of saturated samples when compared to samples without saturation.

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Aquifer disposal of CO2-rich greenhouse gases: Extension of the time scale of experiment for CO2-sequestering reactions by geochemical modelling

Cited by 399 publications

References 31 publications

Qualitative and quantitative changes in detrital reservoir rocks caused by CO<sub>2</sub>–brine–rock interactions during first injection phases (Utrillas sandstones, northern Spain)

Qualitative and quantitative changes in detrital reservoir rocks caused by CO<sub>2</sub>–brine–rock interactions during first injection phases (Utrillas sandstones, northern Spain)

TOUGHREACT User's Guide: A Simulation Program for Non-isothermal Multiphase Reactive Geochemical Transport in Variably Saturated Geologic Media, V1.2.1

Experimental Investigation of Mechanical Properties of Black Shales after CO<sub>2</sub>-Water-Rock Interaction

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Aquifer disposal of CO2-rich greenhouse gases: Extension of the time scale of experiment for CO2-sequestering reactions by geochemical modelling

Cited by 399 publications

References 31 publications

Qualitative and quantitative changes in detrital reservoir rocks caused by CO&lt;sub&gt;2&lt;/sub&gt;–brine–rock interactions during first injection phases (Utrillas sandstones, northern Spain)

Qualitative and quantitative changes in detrital reservoir rocks caused by CO&lt;sub&gt;2&lt;/sub&gt;–brine–rock interactions during first injection phases (Utrillas sandstones, northern Spain)

TOUGHREACT User's Guide: A Simulation Program for Non-isothermal Multiphase Reactive Geochemical Transport in Variably Saturated Geologic Media, V1.2.1

Experimental Investigation of Mechanical Properties of Black Shales after CO<sub>2</sub>-Water-Rock Interaction

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Qualitative and quantitative changes in detrital reservoir rocks caused by CO<sub>2</sub>–brine–rock interactions during first injection phases (Utrillas sandstones, northern Spain)

Qualitative and quantitative changes in detrital reservoir rocks caused by CO<sub>2</sub>–brine–rock interactions during first injection phases (Utrillas sandstones, northern Spain)