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The role of advection and dispersion in the rock matrix on the transport of leaking CO2-saturated brine along a fractured zone
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering. KTH Royal Institute of Technology. (Doctoral Program in Land and Water Resources Engineering)ORCID iD: 0000-0002-6871-8540
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering.ORCID iD: 0000-0003-2726-6821
Universitat 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)
(School of Mechanical, Aerospace and Civil Engineering, University of Manchester, United Kingdom)
(English)Manuscript (preprint) (Other academic)
Abstract [en]

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. 

Keyword [en]
Reactive transport, Advection dominated transport, Diffusive transport, CO2-saturated brine leakage, Transport in fractures, Rock matrix, Calcite kinetic reaction
National Category
Mineral and Mine Engineering
Research subject
Civil and Architectural Engineering; Chemical Engineering; Applied and Computational Mathematics; Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-184616OAI: oai:DiVA.org:kth-184616DiVA: diva2:916390
Funder
StandUp
Note

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.

Available from: 2016-04-01 Created: 2016-04-01 Last updated: 2016-04-04Bibliographically approved
In thesis
1. REACTIVE TRANSPORT MODELLING OF DISSOLVED CO2 IN POROUS MEDIA: Injection into and leakage from geological reservoirs
Open this publication in new window or tab >>REACTIVE TRANSPORT MODELLING OF DISSOLVED CO2 IN POROUS MEDIA: Injection into and leakage from geological reservoirs
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The geological sequestration of carbon dioxide (CO2) is one of the options of controlling the greenhouse gas emissions. However, leakage of CO2 from the storage reservoir is a risk associated with geological sequestration. Over longer times, large-scale groundwater motion may cause leakage of dissolved CO2 (CO2aq).

The objectives of this thesis are twofold. First, the modelling study analyzes the leakage of CO2aq along the conducting pathways. Second, a relatively safer mode of geological storage is investigated wherein CO2aq is injected in a carbonate reservoir. A reactive transport model is developed that accounts for the coupled hydrological transport and the geochemical reactions of CO2aq in the porous media. The study provides a quantitative assessment of the impact of advection, dispersion, diffusion, sorption, geochemical reactions, temperature, and heat transport on the fate of leaking CO2aq.

The mass exchange between the conducting pathway and the rock matrix plays an important role in retention and reactions of leaking CO2aq. A significant retention of leaking CO2aq is caused by its mass stored in aqueous and adsorbed states and its consumption in reactions in the rock matrix along the leakage pathway. Advection causes a significant leakage of CO2aq directly from the reservoir through the matrix in comparison to the diffusion alone in the rock matrix and advection in a highly conducting, but thin fracture. Heat transport by leaking brine also plays an important role in geochemical interactions of leaking CO2aq

Injection of CO2aq is simulated for a carbonate reservoir. Injected CO2-saturated brine being reactive causes fast dissolution of carbonate minerals in the reservoir and fast conversion of CO2aq through considered geochemical reactions. Various parameters like dispersion, sorption, temperature, and minerals reaction kinetics are found to play important role in the consumption of CO2aq in reactions.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. xii, 59 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2016-04
Keyword
CO2 geological storage and safety, leakage of brine saturated with dissolved CO2, reactive transport, fracture, advection, dispersion and diffusion, sorption, carbonate minerals kinetic reactions, calcite, dolomite, siderite, porosity, permeability, heat transport
National Category
Mineral and Mine Engineering
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-184204 (URN)978-91-7595-911-5 (ISBN)
Public defence
2016-04-20, F3, Lindstedstsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
StandUpSwedish Research Council, VR621-2007-4440
Note

Research Funders:

(i) Higher Education Commission (HEC) of Pakistan

(ii) Lars Erik Lundberg Scholarship Foundation, Sweden

Available from: 2016-04-04 Created: 2016-03-30 Last updated: 2016-05-02Bibliographically approved

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Ahmad, NawazWörman, Anders

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