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- W2046535109 abstract "Abstract The quantity and kind of hydrocarbon produced by organic rich shales is determined by the type, amount, distribution, and connectivity of the organics within the rock. The present study applies a new technique for mapping the distribution of organics using impedance contrast in Scanning Acoustic Microscope (SAM) images. Both SAM and SEM images were used to observe key features such as organic size, concentration, natural fractures, and organic lamination parallel to bedding. Complementary petrophysical and topological analyses were conducted with focus on the Wolfcamp shale formation. The low density and compressional velocity of organic matter resulted in lower impedances with respect to the matrix. This impedance contrast made the SAM a suitable instrument to map organics. With a transducer frequency of 100 MHz, we resolved organic features that were larger than 10 µm. Fine core sampling of the Wolfcamp formation exhibited cyclic variation of TOC content that correlated positively with total porosity and connected porosity. Microstructural studies revealed connected organic networks, organic porosity, and microfractures, especially in high TOC samples. NMR wettability studies showed that samples with low TOC tend to be water wet whereas high TOC samples imbibed more dodecane, indicating oil wettability. The topological study on the organics showed that organic particle size distribution is skewed to finer particle areas (average 3.6 ×106 µm2). The organic roundness analysis indicated that most of the particles are circular or elliptical with specific minor to major axis ratios of 0.5 to 0.7. Further topological studies of organics distributed parallel and perpendicular to the bedding plane will be key in elastic modeling. Microstructural studies with SEM and optical microscopes have been constrained to small areas at high resolution. This study indicates that acoustic microscopy can be used to analyze larger areas and provide a better understanding on the role of organic matter in shales at a larger scale." @default.
- W2046535109 created "2016-06-24" @default.
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- W2046535109 date "2013-09-30" @default.
- W2046535109 modified "2023-10-14" @default.
- W2046535109 title "Acoustic Mapping and Characterization of Organic Matter in Shales" @default.
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- W2046535109 doi "https://doi.org/10.2118/166331-ms" @default.
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