Journal
INTERNATIONAL JOURNAL OF COAL GEOLOGY
Volume 231, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.coal.2020.103608
Keywords
Atomic force microscopy-based infrared spectroscopy (AFM-IR); Eagle Ford; Mudstone; Organic matter; Unconventional oil and gas
Categories
Funding
- Energy Resources Program of the U.S. Geological Survey
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The nanoscale molecular composition of sedimentary organic matter is challenging to characterize in situ given the limited tools available that can adequately interrogate its complex chemical structure. This is a particularly relevant issue in source rocks, as kerogen composition will strongly impact its reactivity and so is critical to understanding petroleum generation processes during catagenesis. The recent advent of tip-enhanced analytical methods, such as atomic force microscopy-based infrared spectroscopy (AFM-IR), has allowed for the major compositional features of kerogen and other types of in situ organic matter to be elucidated at spatial resolutions at or below 50 nm. Here AFM-IR was applied to examine inertinite, an important organic matter type, present in a thermally immature Eagle Ford calcareous mudstone. The data show that the nanoscale molecular composition of the examined inertinite is (i) less heterogeneous than solid bitumen in more thermally mature Eagle Ford samples and (ii) more hydrogenand oxygen-rich than inertinite examined in the New Albany Shale.
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