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Title: Self-Sealing Mafic Sills for Carbon and Hydrogen Storage

Journal Article · · Geological Society of London. Special Publication
 [1];  [2];  [3];  [3];  [2];  [3];  [3];  [3];  [4]
  1. West Virginia Univ., Morgantown, WV (United States); National Energy Technology Lab. (NETL), Morgantown, WV (United States)
  2. West Virginia Univ., Morgantown, WV (United States)
  3. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
  4. Pennsylvania Geological Survey, Middletown, PA (United States)

Tabular igneous intrusions (sills) are common features in sedimentary basins and have the potential to be useful seals for fluids (e.g., CO2 or H2) in geological storage scenarios, and may be important as the need for geologic carbon sequestration and alternative fuel storage increases. This is advantageous in regions without ready access to large-volume reservoirs in depleted hydrocarbon plays and saline aquifers, like the northeastern United States. Moreover, geological H2 storage requires more demanding conditions than typically associated with oil and gas. An enhanced seal will have the properties of a traditional seal - competent, low permeability, and laterally extensive - with the addition of being able to self-seal pre-existing and induced fractures. Self-sealing will occur along fluid pathways like fractures where CO2, water, and minerals like plagioclase, olivine, and pyroxene react together. Dolerite sills from the Gettysburg Basin, Pennsylvania, have remarkably low permeability and homogeneous compositions that include minerals that will readily react with CO2 dissolved in water. Here, we characterize the physical properties and chemical gradients within several mafic sills cored in five boreholes. In addition, preliminary CO2-reaction experiments on dolerite samples demonstrated rapid carbonate mineralization.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0004000; 89243318CFE000003
OSTI ID:
1884770
Report Number(s):
DOE/NETL-2022/3312
Journal Information:
Geological Society of London. Special Publication, Vol. 528, Issue 1; ISSN 0305-8719
Publisher:
Geological Society of LondonCopyright Statement
Country of Publication:
United States
Language:
English

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