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- W2465380960 abstract "Abstract This paper focuses on the measurement of pore-scale geometrical and topological properties of heterogeneous Middle East carbonates using scanning electron microscopy (SEM), image analysis, and mercury porosimetry. Quantitative pore network descriptors including porosity, pore body and throat sizes, coordination number (number of throats per pore), shape factor (pore area to perimeter ratio), aspect ratio (pore body to throat size ratio), and their distributions are determined from SEM-based images of thin sections at multiple resolutions as well as physical core measurements. Image analysis revealed pore bodies in 2D images whereas their connecting throat sizes are derived from mercury intrusion data. To compensate for pore sizes that vary over several orders of magnitude, SEM images are collected at 75× and 750× with pixel resolutions of 2.63 and 0.077 µm, respectively. Mosaics (75X) reveal abundant evidence of textural and structural differences within and between the carbonate samples. SEM pore-size distributions generated by merging data from both 75× and 750× images incorporate microporous features as small as 0.077 µm and macropores as large as 310 µm into a single multiscale pore system. A pore-throat classification method was developed relating mercury volume invaded through throats of a given size to the corresponding pore area as derived from SEM data. Four pore-throat classes were identified with unique pore- and throat-size distributions ranging from 0.077 to 310.34 µm and 0.007–23.703 µm, respectively. The average coordination number ranges mostly from 3 to 5, and irregular triangle-shaped cross-sections dominate the carbonate pore system. The pore to throat aspect ratio is generally large (>3), indicating the potential for significant residual oil saturation. These pore system parameters and their distributions provide the basis for future pore network modeling studies and allow for improved understanding of pore structure and network framework and their influence on multiphase transport properties and, accordingly, secondary and enhanced oil recovery efficiency in carbonate reservoirs." @default.
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- W2465380960 date "2016-10-01" @default.
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- W2465380960 title "Multiscale pore structure characterization of middle east carbonates" @default.
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- W2465380960 doi "https://doi.org/10.1016/j.petrol.2016.07.018" @default.
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