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• W2079431344 abstract "Four Haynesville Shale and four Bossier Shale samples were investigated using a combination of Scanning Electron Microscopy (SEM) and Broad Ion Beam (BIB) polishing. This approach enables the microstructure and porosity to be studied down to the mesopore size (<50 nm) in representative areas at the scale of the BIB cross-sections. The samples vary in mineralogy, grain size and TOC and the maturity ranges from 2.42 to 2.58 VRr in the Haynesville Shale to 1.79–2.26 VRr in the Bossier Shale. This variety within the samples enabled us to study controls on the porosity distribution in these shales. Visible pores exist as intraparticle pores mainly in carbonate grains and pyrite framboids and as interparticle pores, mainly in the clay-rich matrix. Pores in organic matter show a characteristic porosity with respect to the type of organic matter, which mainly consists of mixtures of amorphous organic matter and minerals, organic laminae and discrete macerals. A clear positive trend of organic-matter porosity with maturity was found. Pore sizes are power law distributed in the range of 4.4 μm to at least 36 nm in equivalent diameter. The differences in power law exponents suggest that a more grain supported, coarse-grained matrix may prevent pores from mechanical compaction. Porosities measured in the BIB cross-sections were significantly lower in comparison to porosities obtained by Mercury Intrusion Porosimetry (MIP). This difference is mainly attributed to the different resolution achieved with BIB-SEM and MIP and type of pore network. Extrapolation of pore size distributions (PSDs) enables the BIB-SEM porosity to be estimated down to the resolution of the MIP and thus to upscale microstructural observation at the confined space of the BIB-SEM method to bulk porosity measurement. These inferred porosities are in good agreement with the MIP determined porosities, which underpins the assumption that pores segmented in BIB-SEM mosaics are representative of the MIP methodology." @default.
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• W2079431344 date "2015-01-01" @default.
• W2079431344 modified "2023-10-01" @default.
• W2079431344 title "BIB-SEM characterization of pore space morphology and distribution in postmature to overmature samples from the Haynesville and Bossier Shales" @default.
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• W2079431344 doi "https://doi.org/10.1016/j.marpetgeo.2014.09.020" @default.
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