Speaker
Description
The carbon geological storage (CGS) remains one of the most valuable practical means for the mitigation of global warming problem. Since the beginning of the pioneering industrial pilot on CO2 storage in deep saline aquifer (DNA, [1]), the gas injection and related trapping mechanisms have become one of principal targets of the related research fields [2].
The estimation of CGS-related risks and its efficiency are often based on numerical analysis making use of dedicated dynamic reservoir models. Among other information these models incorporate a lot of realistic data about reservoirs structure and properties controlling the subsurface CO2 migration and trapping. Without taking this into consideration the assessment of the CO2 plume evolution characteristics is hardly possible [3,4]. The main objective of our work is the determination of permeability heterogeneity impact on dynamic CO2 dissolution rate at reservoir scale which is an important factor in the description of the CO2 plume dynamics and its geometry.
Taking advantage of a recently gained understanding of CO2-dissolved single-phase mixing dynamics in homogeneous media, the large-scale consideration of the typical heterogeneity cases and its impact on conventional scenarios and general behavior of the fingers pattern from the onset to the late shut-down stage, have been tried, cf. [5]. In particular, the adaptation of known approaches for corresponding permeability variations has been done. As it could be expected, the differences of the convective dissolution (CD) behavior in homogeneous and some heterogeneous reservoirs may incorporate various scenarios of global CD rate evolution with numerous onset, steady-state (SS) or even shut-down (SD) stages for the latter case, reflecting the dynamic interaction between global concentration field and CO2-rich layer. The list above can include some other CO2 dissolution regimes not presented in homogeneous media.
The results of numerical analysis revealed that the properly shaped reference homogeneous medium scaling of the dissolution rate (this includes also properties anisotropy and some other features, cf. [5,6]) may serve as a basis for the realization and assessment of the dissolution rate in case of some continuous permeability variations with depth.
The introduction of key characteristics of the heterogeneous permeability field into relevant stability criteria and numerical models turned out to be a challenge for current research. Methodological aspects of large-scale dynamic simulation of CO2 dissolution in heterogeneous aquifers related to the impact of local properties variation on the global dissolution rate, are first presented and illustrated using most recent results of numerical simulation.
Then the large-scale examples of the dissolution rate upscaling for different characteristics of the continuous permeability variation and corresponding generalized description of the global CD rate evaluation, are considered and discussed. Some details of the upscaling methodology are illustrated in order to specify its possible applicability and generalization on other types of properties heterogeneity.
Considerations of such a kind can provide a valuable information for adaptation of design and monitoring strategy to potential CGS sites.
| References | [1] Ringrose, Ph. S., Furre, Anne-Kari, Gilfillan, Stuart M.V., Krevor, S., Landrø, M., Leslie, R, Meckel, T., Nazarian, B., and A. Zahid (2021) Storage of Carbon Dioxide in Saline Aquifers: Physicochemical Processes, Key Constraints, and Scale-Up Potential, Annu. Rev. Chem. Biomol. Eng. 2021,12:1,471-494. [2] Emami-Meybodi E., H. Hassanzadeh, C. P. Green, J. Ennis-King (2015) Convective dissolution of CO2 in saline aquifers: Progress in modeling and experiments. Int. J. Greenhouse Gas Control 40, 238. https://doi.org/10.1016/j.ijggc.2015.04.003. [3] Simmons, C. T. (2005). Variable density groundwater flow: From current challenges to future possibilities. Hydrogeology Journal, 13, 116-119. [4] Leslie, R., Cavanagh, A. J., Haszeldine, R. S., Johnson, G., Gilfillan, S. M. (2021). Quantification of solubility trapping in natural and engineered CO2 reservoirs. Petroleum Geoscience, 27(4), petgeo2020-120. [5] Bogdanov, I., Blondeau, C. (2024) Simulation of Dynamic CO2 Dissolution During Geological Storage in Heterogeneous Aquifers. GHGT-17 Conference, Available at SSRN 5068926. [6] Erfani, H., Babaei, M., Berg, C. F., et al. Scaling CO2 convection in confined aquifers: Effects of dispersion, permeability anisotropy and geochemistry. Advances in Water Resources, 2022, 164: 104191. |
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| Country | FRANCE |
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