skip to main content

DOE PAGESDOE PAGES

Title: Injectivity Evaluation for Offshore CO 2 Sequestration in Marine Sediments

Global and regional climate change caused by greenhouse gases emissions has stimulated interest in developing various technologies (such as carbon dioxide (CO 2) geologic sequestration in brine reservoirs) to reduce the concentrations of CO 2 in the atmosphere. Our study develops a statistical framework to identify gravitational CO 2 trapping processes and to quantitatively evaluate both CO 2 injectivity (or storage capacity) and leakage potential from marine sediments which exhibit heterogeneous permeability and variable thicknesses. Here, we focus on sets of geostatistically-based heterogeneous models populated with fluid flow parameters from several reservoir sites in the U.S. Gulf of Mexico (GOM). A computationally efficient uncertainty quantification study was conducted with results suggesting that permeability heterogeneity and anisotropy, seawater depth, and sediment thickness can all significantly impact CO 2 flow and trapping. Large permeability/porosity heterogeneity can enhance gravitational, capillary, and dissolution trapping, which acts to deter CO 2 upward migration and subsequent leakage onto the seafloor. When log permeability variance is 5, self-sealing with heterogeneity-enhanced gravitation trapping can be achieved even when water depth is 1.2 km. This extends the previously identified self-sealing condition that water depth be greater than 2.7 km. Our results have yielded valuable insight into the conditions undermore » which safe storage of CO 2 can be achieved in offshore environments. The developed statistical framework is general and can be adapted to study other offshore sites worldwide.« less
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [1] ;  [3] ;  [2] ;  [4] ;  [5] ;  [5] ;  [1] ; ORCiD logo [1] ;  [6] ;  [7]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Earth and Environmental Sciences Division
  2. Univ. of Wyoming, Laramie, WY (United States). Dept. of Geology and Geophysics
  3. Univ. of Utah, Salt Lake City, UT (United States). Energy and Geosciences Inst.
  4. Petroleum Recovery Research Center, Socorro, NM (United States)
  5. Univ. of Texas, Austin, TX (United States). Bureau of Economic Geology
  6. The Ohio State Univ., Columbus, OH (United States). School of Earth Sciences
  7. The Ohio State Univ., Columbus, OH (United States). Dept. of Civil, Environmental, and Geodetic Engineering
Publication Date:
Report Number(s):
LA-UR-16-27675
Journal ID: ISSN 1876-6102
Grant/Contract Number:
AC52-06NA25396; FC26-05NT42591
Type:
Accepted Manuscript
Journal Name:
Energy Procedia
Additional Journal Information:
Journal Volume: 114; Journal Issue: C; Conference: GHGT-13 ; 2016-11-14 - 2016-11-18 ; Lausanne, Switzerland; Journal ID: ISSN 1876-6102
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; Earth Sciences; gravitational trapping; offshore sediment; CO2 sequestration; injectivity; leakage potential; sediment heterogeneity
OSTI Identifier:
1378916