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Title: Impact of Pore Fluid Chemistry on Fine-Grained Sediment Fabric and Compressibility

Journal Article · · Journal of Geophysical Research. Solid Earth
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [5]
  1. U.S. Geological Survey, Woods Hole MA (United States); U. S. Geological Survey
  2. Louisiana State Univ., Baton Rouge, LA (United States). Civil and Environmental Engineering
  3. U.S. Geological Survey, Menlo Park, CA (United States)
  4. Louisiana State Univ., Baton Rouge, LA (United States). Civil and Environmental Engineering; Chungbuk National Univ., Chungbuk (South Korea). School of Civil Engineering
  5. U.S. Geological Survey, Woods Hole MA (United States)

Fines, defined here as grains or particles, less than 75µm in diameter, exist nearly ubiquitously in natural sediment, even those classified as coarse. Macroscopic sediment properties, such as compressibility, which relates applied effective stress to the resulting sediment deformation, depend on the fabric of fines. Unlike coarse grains, fines have sizes and masses small enough to be more strongly influenced by electrical interparticle forces than by gravity. These electrical forces acting through pore fluids are influenced by pore-fluid chemistry changes. Macroscopic property dependence on pore-fluid chemistry must be accounted for in sediment studies involving subsurface flow and sediment stability analyses, as well as in engineered flow situations such as groundwater pollutant remediation, hydrocarbon migration or other energy resource extraction applications. This study demonstrates how the liquid-limit-based electrical sensitivity index can be used to predict sediment compressibility changes due to pore-fluid chemistry changes. Laboratory tests of electrical sensitivity, sedimentation and compressibility illustrate mechanisms linking micro- and macro-scale processes for selected pure, endmember fines. In conclusion, a specific application considered here is methane extraction via depressurization of gas hydrate-bearing sediment, which causes a dramatic pore-water salinity drop concurrent with sediment being compressed by the imposed effective stress increase.

Research Organization:
Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0028966; FE0026166
OSTI ID:
1460770
Journal Information:
Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Journal Issue: 7 Vol. 123; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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