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Title: System-level risk assessment of carbon sequestration into a naturally fractured aquifer at Kevin Dome, Montana

Abstract

As actual CO2 injection is unlikely to take place at Kevin Dome, Montana, the Big Sky Carbon Sequestration Partnership has turned to maximizing the value of existing data acquired at the site. We present the risk assessment work done using the National Risk Assessment Partnership (NRAP) to Kevin Dome, Montana. Geologic CO2 sequestration in saline aquifers poses certain risks including CO2/brine leakage through wells or non-sealing faults into ground water or land surface. These risks are difficult to quantify due to data availability and uncertainty. One solution is running large numbers of numerical simulations on the primary CO2 injection reservoir, shallow reservoirs/aquifers, faults, and wells to assess leakage risks and uncertainties. However, a full-physics simulation is usually too computationally expensive. NRAP integrated assessment model (NRAP-IAM) uses reduced order models (ROMs) developed from numerical reservoir simulations of a primary CO2 injection reservoir to address this issue. A powerful stochastic framework allows NRAP-IAM to explore complex interactions among many uncertain variables and evaluate the likely performance of potential sequestration sites. In this study, we investigate the sensitivity of a variety of uncertain parameters to CO2/brine leakage through (1) legacy wellbore and (2) fault pathways. We found major uncertain parameters to which themore » potential CO2 leakage through legacy wellbore is sensitive including values of fracture permeability, end-point CO2 relative permeability, capillary pressure, and permeability of confining rocks. CO2 and brine leakage through fault pathways is sensitive to fracture permeability, length of the faults, and fault displacement.« less

Authors:
 [1];  [2];  [2];  [2];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); University of Wyoming
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. University of Wyoming
Publication Date:
Research Org.:
Montana State University
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1463668
DOE Contract Number:  
FC26-05NT42587
Resource Type:
Conference
Resource Relation:
Conference: 10th Annual Meeting of Interpore, New Orleans, LA, May 14-17, 2018
Country of Publication:
United States
Language:
English

Citation Formats

Nguyen, Minh, Onishi, Tsubasa, Stauffer, Phil, J., Carey William, and Zhang, Ye. System-level risk assessment of carbon sequestration into a naturally fractured aquifer at Kevin Dome, Montana. United States: N. p., 2018. Web.
Nguyen, Minh, Onishi, Tsubasa, Stauffer, Phil, J., Carey William, & Zhang, Ye. System-level risk assessment of carbon sequestration into a naturally fractured aquifer at Kevin Dome, Montana. United States.
Nguyen, Minh, Onishi, Tsubasa, Stauffer, Phil, J., Carey William, and Zhang, Ye. Thu . "System-level risk assessment of carbon sequestration into a naturally fractured aquifer at Kevin Dome, Montana". United States. https://www.osti.gov/servlets/purl/1463668.
@article{osti_1463668,
title = {System-level risk assessment of carbon sequestration into a naturally fractured aquifer at Kevin Dome, Montana},
author = {Nguyen, Minh and Onishi, Tsubasa and Stauffer, Phil and J., Carey William and Zhang, Ye},
abstractNote = {As actual CO2 injection is unlikely to take place at Kevin Dome, Montana, the Big Sky Carbon Sequestration Partnership has turned to maximizing the value of existing data acquired at the site. We present the risk assessment work done using the National Risk Assessment Partnership (NRAP) to Kevin Dome, Montana. Geologic CO2 sequestration in saline aquifers poses certain risks including CO2/brine leakage through wells or non-sealing faults into ground water or land surface. These risks are difficult to quantify due to data availability and uncertainty. One solution is running large numbers of numerical simulations on the primary CO2 injection reservoir, shallow reservoirs/aquifers, faults, and wells to assess leakage risks and uncertainties. However, a full-physics simulation is usually too computationally expensive. NRAP integrated assessment model (NRAP-IAM) uses reduced order models (ROMs) developed from numerical reservoir simulations of a primary CO2 injection reservoir to address this issue. A powerful stochastic framework allows NRAP-IAM to explore complex interactions among many uncertain variables and evaluate the likely performance of potential sequestration sites. In this study, we investigate the sensitivity of a variety of uncertain parameters to CO2/brine leakage through (1) legacy wellbore and (2) fault pathways. We found major uncertain parameters to which the potential CO2 leakage through legacy wellbore is sensitive including values of fracture permeability, end-point CO2 relative permeability, capillary pressure, and permeability of confining rocks. CO2 and brine leakage through fault pathways is sensitive to fracture permeability, length of the faults, and fault displacement.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {5}
}

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