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Title: Internal Domains of Natural Porous Media Revealed: Critical Locations for Transport, Storage, and Chemical Reaction

Journal Article · · Environmental Science and Technology
 [1];  [2];  [3];  [4];  [1];  [1];  [5];  [6];  [6]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Pennsylvania State Univ., University Park, PA (United States)
  3. Univ. of Arizona, Tucson, AZ (United States)
  4. Iowa State Univ., Ames, IA (United States)
  5. Univ. of Tennessee, Knoxville, TN (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
+ Show Author Affiliations

Internal pore domains exist within rocks, lithic fragments, subsurface sediments and soil aggregates. These domains, which we term internal domains in porous media (IDPM), contain a significant fraction of their porosity as nanopores, dominate the reactive surface area of diverse porous media types, and are important locations for chemical reactivity and hydrocarbon storage. Traditionally difficult to interrogate, advances in instrumentation and imaging methods are providing new insights on the physical structures and chemical attributes of IDPM. In this review we: discuss analytical methods to characterize IDPM, evaluate what has been learned about their size distributions, connectivity, and extended structures; determine whether they exhibit unique chemical reactivity; and assess potential for their inclusion in reactive transport models. Three key findings are noteworthy. 1) A combination of methods now allows complete characterization of the porosity spectrum of natural materials and its connectivity; while imaging microscopies are providing three dimensional representations of the interconnected pore network. 2) Chemical reactivity in pores <10 nm is expected to be different from micro and macropores, yet research performed to date is inconclusive on the nature, direction, and magnitude of effect. 3) Existing continuum reactive transport models treat IDPM as a sub-grid feature with average, empirical, scale-dependent parameters; and are not formulated to include detailed information on pore networks. Overall we find that IDPM are key features controlling hydrocarbon release from shales in hydrofracking systems, organic matter stabilization and recalcitrance in soil, weathering and soil formation, and long term inorganic and organic contaminant behavior in the vadose zone and groundwater. We conclude with an assessment of impactful research opportunities to advance understanding of IDPM, and to incorporate their important effects in reactive transport models for improved environmental simulation and prediction.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; AC05-76RL01830
OSTI ID:
1279392
Alternate ID(s):
OSTI ID: 1254594
Report Number(s):
PNNL-SA-113657; KC0302060; ERKCC72
Journal Information:
Environmental Science and Technology, Vol. 50, Issue 6; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 69 works
Citation information provided by
Web of Science

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Predictions of non-Fickian solute transport in different classes of porous media using direct simulation on pore-scale images journal January 2013
Multispecies diffusion models: A study of uranyl species diffusion: MULTISPECIES DIFFUSION MODELS journal December 2011
Effect of quartz overgrowth precipitation on the multiscale porosity of sandstone: A (U)SANS and imaging analysis journal June 2015
New Approach to Measure Soil ParticulateOrganic Matter in Intact Samples Using X-ray Computed Microtomography journal January 2014
Molecular dynamics simulations of the orthoclase (001)- and (010)-water interfaces journal March 2008
Low Pore Connectivity Increases Bacterial Diversity in Soil journal April 2010
Spatial Patterns and Modeling of Reductive Ferrihydrite Transformation Observed in Artificial Soil Aggregates journal September 2009
Application of a multiprocess nonequilibrium sorption model to solute transport in a stratified porous medium journal April 1991
Microscopic reactive diffusion of uranium in the contaminated sediments at Hanford, United States: MICROSCOPIC REACTIVE DIFFUSION journal December 2006
Multi-scale characterization of pore evolution in a combustion metamorphic complex, Hatrurim basin, Israel: Combining (ultra) small-angle neutron scattering and image analysis journal November 2013
13. Mesoscale and Hybrid Models of Fluid Flow and Solute Transport book December 2015
Characterization and Analysis of Porosity and Pore Structures book December 2015
Precipitation in Pores: A Geochemical Frontier book December 2015
Ionic Transport in Nano-Porous Clays with Consideration of Electrostatic Effects book December 2015

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Interfacial reactions of Cu( ii ) adsorption and hydrolysis driven by nano-scale confinement journal January 2020
“On demand” triggered crystallization of CaCO3 from solute precursor species stabilized by the water-in-oil microemulsion text January 2018
Optical imaging of surface chemistry and dynamics in confinement journal July 2017
The interfacial structure of water droplets in a hydrophobic liquid journal May 2017
Optical Imaging of Surface Chemistry and Dynamics in Confinement text January 2017
Reactive infiltration instability amplifies the difference between geometric and reactive surface areas in natural porous materials text January 2017
The Effects of Natural Mineral Coatings on Metal Transport in Contaminated Aquifers book January 2019
Effects of a thermal perturbation on mineralogy and pore water composition in a clay-rock: An experimental and modeling study journal January 2017

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58 GEOSCIENCES
pore systems
characterization
gas shale