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On Caprock Seal Integrity of Tuscaloosa Mudstone at Cranfield, MS (USA), CO2 Injection Site

Journal Article · · Sustainability (Basel)
DOI:https://doi.org/10.3390/su16135758· OSTI ID:2397249
 [1];  [2];  [1]
  1. National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States)
  2. National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States); NETL Support Contractor, Pittsburgh, PA (United States)
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Saline formations deep underground are among the most promising targets for large-scale geologic carbon storage. The caprock seal integrity evaluation is an important component of commercial-scale CO2 sequestration projects. Measurements of the porosity and permeability of mudstone samples from the NETL-supported Cranfield Project were performed using a helium porosimeter and a core flow apparatus, before and after exposure in a CO2-saturated brine environment. The permeability of the core samples rapidly decreased with the increase in confining pressure and did not fully recover after decompression. On the other hand, exposure to CO2 led to an increase in the permeability by at least an order of magnitude. The porosity changes after the exposure were not substantial. The post-exposure increase in permeability was subsequently offset by its rapid decrease during the higher-pressure confinement. Extrapolation of the observed permeability trends to in situ reservoir conditions suggests that Tuscaloosa mudstone can effectively serve as a natural seal.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy and Carbon Management (FECM)
OSTI ID:
2397249
Journal Information:
Sustainability (Basel), Journal Name: Sustainability (Basel) Journal Issue: 13 Vol. 16; ISSN 2071-1050
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

References (14)

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Related Subjects

58 GEOSCIENCES
mudstone
permeability
porosity