The role of advection and dispersion in the rock matrix on the transport of leaking CO2-saturated brine along a fractured zone

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Ahmad, Nawaz,1972-KTH,Vattendragsteknik,Doctoral Program in Land and Water Resources Engineering (author)

The role of advection and dispersion in the rock matrix on the transport of leaking CO2-saturated brine along a fractured zone

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LIBRIS-ID:oai:DiVA.org:kth-184616
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-184616URI

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Language:English
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This manuscript is under review in the journal of Advances in Water Resources. The main funder for this study has been “Higher Education Commission (HEC) of Pakistan”. The study was also partly supported by Lars Erik Lundberg Scholarship Foundation, Sweden.
CO2 that is injected into a storage reservoir can leak in dissolved form because of brine displacement from the reservoir, which is caused by large-scale groundwater motion. Simulations of the reactive transport of leaking CO2aq along a conducting fracture in a clay-rich caprock are conducted to analyze the effect of various physical and geochemical processes. Whilst several modelling transport studies along rock fractures have considered diffusion as the only transport process in the surrounding rock matrix (diffusive transport), this study analyzes the combined role of advection and dispersion in the rock matrix in addition to diffusion (advection-dominated transport) on the migration of CO2aq along a leakage pathway and its conversion in geochemical reactions. A sensitivity analysis is performed to quantify the effect of fluid velocity and dispersivity. Variations in the porosity and permeability of the medium are observed in response to calcite dissolution and precipitation along the leakage pathway. We observe that advection and dispersion in the rock matrix play a significant role in the overall transport process. For the parameters that were used in this study, advection-dominated transport increased the leakage of CO2aq from the reservoir by nearly 305%, caused faster transport and increased the mass conversion of CO2aq in geochemical reactions along the transport pathway by approximately 12.20% compared to diffusive transport.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Naturresursteknik Mineral- och gruvteknik hsv//swe
ENGINEERING AND TECHNOLOGY Environmental Engineering Mineral and Mine Engineering hsv//eng
Reactive transport
Advection dominated transport
Diffusive transport
CO2-saturated brine leakage
Transport in fractures
Rock matrix
Calcite kinetic reaction
Byggvetenskap
Civil and Architectural Engineering
Chemical Engineering
Kemiteknik
Tillämpad matematik och beräkningsmatematik
Applied and Computational Mathematics
Land and Water Resources Engineering
Mark- och vattenteknik

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Wörman, AndersKTH,Vattendragsteknik(Swepub:kth)u1lfcm16 (author)
Sanchez-Vila, XavierUniversitat Politècnica de Catalunya, UPC-BarcelonaTech, 08034 Barcelona, Spain,Hydrogeology Group, Department of Geotechnical Engineering and Geosciences, Universitat Politècnica de Catalunya, UPC-BarcelonaTech, 08034 Barcelona, Spain (author)
Bottacin-Busolin, AndreaSchool of Mechanical, Aerospace and Civil Engineering, University of Manchester, United Kingdom (author)
KTHVattendragsteknik (creator_code:org_t)

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