Numerical Simulation of Pore Size Dependent Anhydrite Precipitation in Geothermal Reservoirs

Murmann, M.; Kühn, Michael; Pape, H.; Clauser, Christoph

doi:10.1016/j.egypro.2013.08.014

Cited by 5 publications

(6 citation statements)

References 19 publications

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“…Such changes in ion concentration may influence polymorph formation, where it has been suggested that higher concentrations of carbonate promote aragonite formation (55). This is further supported by numerical simulations which predict lower ion activity coefficients adjacent to a charged membrane surface, and thus preferential formation of crystals in the center of pores (56). Unfortunately, it is not currently possible to measure the ionic profiles next to a charged surface in submicron pores.…”

Section: Discussionmentioning

confidence: 85%

Confinement generates single-crystal aragonite rods at room temperature

Zeng

Kim

Anduix‐Canto

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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The topic of calcite and aragonite polymorphism attracts enormous interest from fields including biomineralization and paleogeochemistry. While aragonite is only slightly less thermodynamically stable than calcite under ambient conditions, it typically only forms as a minor product in additive-free solutions at room temperature. However, aragonite is an abundant biomineral, and certain organisms can selectively generate calcite and aragonite. This fascinating behavior has been the focus of decades of research, where this has been driven by a search for specific organic macromolecules that can generate these polymorphs. However, despite these efforts, we still have a poor understanding of how organisms achieve such selectivity. In this work, we consider an alternative possibility and explore whether the confined volumes in which all biomineralization occurs could also influence polymorph. Calcium carbonate was precipitated within the cylindrical pores of track-etched membranes, where these enabled us to systematically investigate the relationship between the membrane pore diameter and polymorph formation. Aragonite was obtained in increasing quantities as the pore size was reduced, such that oriented single crystals of aragonite were the sole product from additive-free solutions in 25-nm pores and significant quantities of aragonite formed in pores as large as 200 nm in the presence of low concentrations of magnesium and sulfate ions. This effect can be attributed to the effect of the pore size on the ion distribution, which becomes of increasing importance in small pores. These intriguing results suggest that organisms may exploit confinement effects to gain control over crystal polymorph.

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Section: Discussionmentioning

confidence: 85%

Confinement generates single-crystal aragonite rods at room temperature

Zeng

Kim

Anduix‐Canto

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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“…The persistence of open pores in the submicron range could be the result of pore-size controlled solubility, but this does not explain the differences when the pore sizes are much larger. Some other systematic effect of surface to volume ratio of the pores, such as the surface-charge model suggested by Mürmann et al (2013) or effects related to solute transport into pores of different sizes may be important.…”

Section: Discussionmentioning

confidence: 98%

“…Mürmann et al (2013) modifi ed this model by considering that the surface charge on the pore walls will interact with the ions in the fl uid and change their activity and hence the supersaturation of the fl uid. Using a numerical simulation they calculated the relationship between pore size and the crystallization as a function of supersaturation and showed that by including the surface charge the pore radius at which pore-size-controlled solubility is relevant is shifted from the nanometre to the micrometre range.…”

Section: What Inhibits Nucleation In Small Pores?mentioning

confidence: 99%

Transient Porosity Resulting from Fluid–Mineral Interaction and its Consequences

Putnis

2015

Reviews in Mineralogy and Geochemistry

118

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“…Table 1. Porosities and permeabilities along a 0.5 m Bentheim core observed during a core flooding experiment (Bartels et al, 2002 actants transported to the fluid-mineral interface (Noiriel and Daval, 2017), and (2) a uniform precipitation independent of the fluid flow, that represents a surface reaction-controlled process, whereby the chemical reaction rate limits precipitation and pore space alters homogeneously (Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

Digital rock physics approach to simulate hydraulic effects of anhydrite cement in Bentheim sandstone

2020

Self Cite

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Abstract. Cementation of potential reservoir rocks is a geological risk, which may strongly reduce the productivity and injectivity of a reservoir, and hence prevent utilisation of the geologic subsurface, as it was the case for the geothermal well of Allermöhe, Germany. Several field, laboratory and numerical studies examined the observed anhydrite cementation to understand the underlying processes and permeability evolution of the sandstone. In the present study, a digital rock physics approach is used to calculate the permeability variation of a highly resolved three-dimensional model of a Bentheim sandstone. Porosity-permeability relations are determined for reaction- and transport-controlled precipitation regimes, whereby the experimentally observed strong decrease in permeability can be approximated by the transport-limited precipitation assuming mineral growth in regions of high flow velocities. It is characterised by a predominant clogging of pore throats, resulting in a drastic reduction in connectivity of the pore network and can be quantified by a power law with an exponent above ten. Since the location of precipitation within the pore space is crucial for the hydraulic rock properties at the macro scale, the determined porosity-permeability relations should be accounted for in large-scale numerical simulation models to improve their predictive capabilities.

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Numerical Simulation of Pore Size Dependent Anhydrite Precipitation in Geothermal Reservoirs

Cited by 5 publications

References 19 publications

Confinement generates single-crystal aragonite rods at room temperature

Confinement generates single-crystal aragonite rods at room temperature

Transient Porosity Resulting from Fluid–Mineral Interaction and its Consequences

Digital rock physics approach to simulate hydraulic effects of anhydrite cement in Bentheim sandstone

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