Journal
MARINE AND PETROLEUM GEOLOGY
Volume 104, Issue -, Pages 331-345Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2019.03.008
Keywords
Thermal maturity; Raman spectroscopy; Palynomorph Darkness Index; Multivariate data analysis
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Funding
- MIUR Roma Tre Postdoctoral Grant (2017-2020) [REP. 22 -PROT. 219]
- Fondo Ricerca di Base 2018 (SPIRICBAS2018), Department of Physics and Geology, University of Perugia
- Grant of Excellence Departments, MIUR (ARTICOLO 1) [COMMI 314-337 LEGGE 232/2016]
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Thermal maturity of six organic rich samples from Jurassic continental successions cropping out in the Holy Cross Mountains in Central Poland, has been characterized by classic thermal maturity indicators, micro-Raman spectroscopy and Palynomorph Darkness Index, in order to create a multi-method workflow for complex palynofacies thermal maturity assessment. Transmitted light observations on dispersed organic matter define a Hettangian lacustrine depositional environment, characterized by periods of reducing/oxidizing conditions and variable sedimentation rates. Thermal maturity detected by classical maturity indicators and PDI indicates an early maturation stage of hydrocarbon generation and is in agreement with spectroscopic analyses performed on phytoclast groups. Moreover, Raman parameters in the sporomorph group indicate a systematic shift toward a lower degree of aromatization compared to the phytoclast group. Finally, the multivariate statistical analysis performed on Raman spectra is found to be a promising tool to define and predict the heterogeneity of dispersed organic matter in sediments.
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