Impact of reservoir parameters and wellbore permeability uncertainties on CO2 and brine leakage potential at the Shenhua CO2 Storage Site, China

Gan, Manguang; Nguyen, Minh C.; Zhang, Liwei; Wei, Ning; Li, Jun; Lei, Hongwu; Wang, Yan; Li, Xiaochun; Stauffer, Philip H.

doi:10.1016/j.ijggc.2021.103443

Impact of reservoir parameters and wellbore permeability uncertainties on CO₂ and brine leakage potential at the Shenhua CO₂ Storage Site, China

Journal Article · Wed Sep 08 04:00:00 EDT 2021 · International Journal of Greenhouse Gas Control

DOI:https://doi.org/10.1016/j.ijggc.2021.103443· OSTI ID:2532379

Gan, Manguang ^[1]; ^[2]; ^[1]; ^[1]; Li, Jun ^[3]; Lei, Hongwu ^[4]; Wang, Yan ^[4]; Li, Xiaochun ^[1]; Stauffer, Philip H. ^[5]

Chinese Academy of Sciences (CAS), Wuhan (China); University of Science and Technology Beijing (China)
University of Wyoming, Laramie, WY (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
China University of Geosciences (Wuhan) (CUG), (China)
Chinese Academy of Sciences (CAS), Wuhan (China)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Here, this paper describes a system-level risk assessment for the Shenhua CO₂ storage site, China, using the National Risk Assessment Partnership Integrated Assessment Model for Carbon Storage (NRAP-IAM-CS). Here, we begin by determining the optimal number of Monte Carlo (MC) simulations to achieve CO₂ and brine leakage result convergence. Then, we calculate mass CO₂ and brine leakage to the atmosphere and a hypothetical shallow aquifer. Finally, we assess the geochemical impacts in the event of leakage as if there were a shallow freshwater aquifer at the Shenhua site. Simulation results show that leakage results tend to stabilize after 300 Monte Carlo simulations. When the three wells on site are assigned a permeability of 10^-11 m² (representing significantly leaking wells), moderate CO₂ and brine leakages occur, and the percentage of CO₂ leakage exceeds the threshold value we set based on the Intergovernmental Panel on Climate Change (IPCC). This is, however, unlikely to be the case for the Shenhua site. For all the other scenarios, the CO₂ leakage is trivial although there is still the possibility of CO₂ leakage into the groundwater aquifer exceeding the 1% threshold over 1000 years, assuming constant legacy wellbore permeability. For the significantly leaking scenario, there is a 10% probability to have a moderate (2.7 × 10⁷ m³) leakage-affected volume in the shallow aquifer with the pH below 6.5, and a large (1.4 × 10⁸ m³) volume with the total dissolved solids (TDS) above 500 ppm, hence pH and TDS may be considered for site monitoring plans. Based on the simulation results, there is a very low probability of significant CO₂/brine leakage through the existing wells at the Shenhua CO₂ storage site.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Fossil Energy and Carbon Management (FECM); U.S.-China Clean Energy Research Center (CERC)

Grant/Contract Number:: 89233218CNA000001; PI0000017

OSTI ID:: 2532379

Report Number(s):: LA-UR--21-20782

Journal Information:: International Journal of Greenhouse Gas Control, Journal Name: International Journal of Greenhouse Gas Control Vol. 111; ISSN 1750-5836

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Impact of reservoir parameters and wellbore permeability uncertainties on CO2 and brine leakage potential at the Shenhua CO2 Storage Site, China

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