Thermal and solubility effects on fault leakage during geologic carbon storage
- Univ. of Southern California, Los Angeles, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Freshwater Trust, Portland, OR (United States)
- Univ. of Southern California, Los Angeles, CA (United States)
Geologic carbon storage (GCS) is a promising method for reducing anthropogenic CO2 emissions to the atmosphere. To safely deploy GCS in the field, it is necessary to assess risks and the effect of uncertainty on safe storage. The effect of uncertainty can be quantified using batches of simulations, but the high computational costs of high-resolution simulations necessitate use of reduced-order models (ROMs). Previous work involves ROMs for quantifying the risk of different potential leakage paths from storage reservoirs to shallow formations. However, previous studies on development of fault-leakage ROMs have limited numbers of uncertain parameters and do not explicitly examine impacts of CO2 solubility and thermal stresses on fault reactivation, which can generate high-permeability pathways and compromise CO2 storage. Here, we analyze an ensemble of simulations considering CO2 leakage from a storage reservoir to a shallow aquifer through a fault while varying a number of uncertain parameters related to thermo-hydro-mechanical properties and CO2 injection. We show the effects of solubility on: free-phase CO2-leakage rates, brine-leakage rates, and poroelastic fault destabilization. We find that CO2 solubility is more important for estimating free-phase CO2-leakage rates compared to brine-leakage rates or poroelastic fault destabilization. We also find that thermal stresses and overpressures have different spatial distributions within the fault, indicating that the spatial variability of overpressures due to variation in flow parameters does not necessarily make the spatial variability of thermal stresses negligible. We suggest the use of the CO2 phase-change path as a variable in future fault-leakage ROMs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE), Clean Coal and Carbon Management
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1866957
- Report Number(s):
- LA-UR-21-24959
- Journal Information:
- International Journal of Greenhouse Gas Control, Journal Name: International Journal of Greenhouse Gas Control Vol. 116; ISSN 1750-5836
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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