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Title: U.S. DOE NETL methodology for estimating the prospective CO 2 storage resource of shales at the national and regional scale

While the majority of shale formations will serve as reservoir seals for stored anthropogenic carbon dioxide (CO2), hydrocarbon-bearing shale formations may be potential geologic sinks after depletion through primary production. Here in this paper we present the United States-Department of Energy-National Energy Technology Laboratory (US-DOE-NETL) methodology for screening-level assessment of prospective CO 2 storage resources in shale using a volumetric equation. Volumetric resource estimates are produced from the bulk volume, porosity, and sorptivity of the shale and storage efficiency factors based on formation-scale properties and petrophysical limitations on fluid transport. Prospective shale formations require: (1) prior hydrocarbon production using horizontal drilling and stimulation via staged, high-volume hydraulic fracturing, (2) depths sufficient to maintain CO 2 in a supercritical state, generally >800 m, and (3) an overlying seal. The US-DOE-NETL methodology accounts for storage of CO 2 in shale as a free fluid phase within fractures and matrix pores and as an sorbed phase on organic matter and clays. Uncertainties include but are not limited to poorly-constrained geologic variability in formation thickness, porosity, existing fluid content, organic richness, and mineralogy. Knowledge of how these parameters may be linked to depositional environments, facies, and diagenetic history of the shale will improve themore » understanding of pore-to-reservoir scale behavior, and provide improved estimates of prospective CO 2 storage.« less
ORCiD logo [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [4] ;  [1]
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
  2. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
  3. Illinois State Geological Survey, Champaign, IL (United States)
  4. Univ. of North Dakota, Grand Forks, ND (United States). Energy & Environmental Research Center
Publication Date:
Report Number(s):
Journal ID: ISSN 1750-5836; PII: S1750583616302109
Accepted Manuscript
Journal Name:
International Journal of Greenhouse Gas Control
Additional Journal Information:
Journal Volume: 51; Journal Issue: C; Journal ID: ISSN 1750-5836
Research Org:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org:
Country of Publication:
United States
25 ENERGY STORAGE; Carbon Sequestration; storage resource; shale; carbon dioxide
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1325371