期刊
ENERGY & FUELS
卷 30, 期 6, 页码 4438-4449出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.5b02878
关键词
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资金
- National Science Foundation [DMR-0944772]
- Laboratory Directed Research and Development Program of Oak Ridge National Laboratory
- Pittsburgh Association of Petroleum Geologists Named Grant (AAPG Foundation)
- NSF [OCE 11-40159]
- DOE OBES Grant [DE-FG02-OSER15675]
- Oak Ridge National Laboratory [DE-AC05-00OR22725]
- U.S. Department of Energy [DE-AC05-00OR22725]
- DOE Energy Frontier Research Center (EFRC) Nanoscale Control of Geologic CO2 [698077]
- NSF Dimensions Program, Division of Environmental Biology [DEB-1342701]
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy
- NSF Critical Zone Observatory program [EAR 12-39285, EAR 13-31726]
- Penn State's Forestland Management Office in the College of Agricultural Sciences
- Direct For Biological Sciences
- Division Of Environmental Biology [1342701] Funding Source: National Science Foundation
Pores within organic matter (OM) are a significant contributor to the total pore system in gas shales. These pores contribute most of the storage capacity in gas shales. Here we present a novel approach to characterize the OM pore structure (including the porosity, specific surface area, pore size distribution, and water accessibility) in Marcellus shale. By using ultrasmall and small-angle neutron scattering, and by exploiting the contrast matching of the shale matrix with suitable mixtures of deuterated and protonated water, both total and water-accessible porosity were measured on centimeter-sized samples from two boreholes from the nanometer to micrometer scale with good statistical coverage. Samples were also measured after combustion at 450 degrees C. Analysis of scattering data from these procedures allowed quantification of OM porosity and water accessibility. OM hosts 24-47% of the total porosity for both organic-rich and-poor samples. This porosity occupies as much as 29% of the OM volume. In contrast to the current paradigm in the literature that OM porosity is organophilic and therefore not likely to contain water, our results demonstrate that OM pores with widths >20 nm exhibit the characteristics of water accessibility. Our approach reveals the complex structure and wetting behavior of the OM porosity at scales that are hard to interrogate using other techniques.
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