Item talk:Q263828
From geokb
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"abstract": "Raman spectroscopy\u00a0has recently received attention as a means to estimate\u00a0thermal maturity\u00a0of organic matter in\u00a0petroleum\u00a0generating source rocks to complement more traditional approaches such as\u00a0vitrinite reflectance\u00a0and programmed\u00a0pyrolysis. While many studies have observed positive correlations between source rock thermal maturity and Raman spectral parameters, little attention has been given to the degree of variation in the Raman response across individual organic grains, especially for\u00a0shales\u00a0or\u00a0mudrocks\u00a0with highly dispersed organic matter. Here the spatial variation in Raman estimates of thermal maturity within individual organic grains is assessed from shales from the Boquillas, Marcellus, Niobrara, and Woodford Formations. The thermal maturity parameters extracted from\u00a0Raman spectra\u00a0can vary widely across distances of \u22645\u202f\u03bcm within the same organic grain. These results illustrate the high degree of chemical heterogeneity inherent to the organic matter within these source rocks. Additionally, the spatial pattern of the Raman parameters, as revealed by 2D Raman mapping, imply that organic matter structure is influenced by associations with\u00a0mineral surfaces\u00a0within the surrounding rock matrix. Chemical heterogeneity and matrix effects directly impact the Raman response from these types of materials and thus the extracted thermal maturity estimate. These findings highlight the care which must be adopted when making Raman measurements of organic matter within source rock matrices, especially for samples which feature highly dispersed, heterogeneous organic matter as found in petroliferous mudrocks.",
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