Vitrinite Reflectance Analysis

2021 ◽  
pp. 1-14
Author(s):  
Paul C. Hackley
Keyword(s):  
Vitrinite Reflectance ◽  
Reflectance Analysis

scholarly journals Evaluating Molecular Evolution of Kerogen by Raman Spectroscopy: Correlation with Optical Microscopy and Rock-Eval Pyrolysis

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1406 ◽  
Author(s):  
Seyedalireza Khatibi ◽  
Mehdi Ostadhassan ◽  
David Tuschel ◽  
Thomas Gentzis ◽  
Humberto Carvajal-Ortiz
Keyword(s):  
Raman Spectroscopy ◽  
Organic Matter ◽  
Structural Information ◽  
Vitrinite Reflectance ◽  
Nondestructive Method ◽  
Thermal Maturity ◽  
Shale Formations ◽  
Reflectance Analysis ◽  
Rock Eval ◽  
Maturity Parameters

Vitrinite maturity and programmed pyrolysis are conventional methods to evaluate organic matter (OM) regarding its thermal maturity. Moreover, vitrinite reflectance analysis can be difficult if prepared samples have no primary vitrinite or dispersed widely. Raman spectroscopy is a nondestructive method that has been used in the last decade for maturity evaluation of organic matter by detecting structural transformations, however, it might suffer from fluorescence background in low mature samples. In this study, four samples of different maturities from both shale formations of Bakken (the upper and lower members) Formation were collected and analyzed with Rock-Eval (RE) and Raman spectroscopy. In the next step, portions of the same samples were then used for the isolation of kerogen and analyzed by Raman spectroscopy. Results showed that Raman spectroscopy, by detecting structural information of OM, could reflect thermal maturity parameters that were derived from programmed pyrolysis. Moreover, isolating kerogen will reduce the background noise (fluorescence) in the samples dramatically and yield a better spectrum. The study showed that thermal properties of OM could be precisely reflected in Raman signals.

scholarly journals THE ZONATION OF COAL RANK IN MUARA ENIM FORMATION BASED ON THE REFLECTION STUDY

2021 ◽  
Vol 56 (4) ◽  
pp. 484-490
Author(s):  
Irfan Marwanza ◽  
Chairul Nas ◽  
Masagus Ahmad Azizi ◽  
Riskaviana Kurniawati ◽  
Ardiansyah
Keyword(s):  
Vitrinite Reflectance ◽  
Volatile Matter ◽  
Plant Residue ◽  
Petrographic Analysis ◽  
Coal Rank ◽  
Anthracite Coal ◽  
Reflectance Analysis ◽  
Southwest Region ◽  
Physical Changes ◽  
Descriptive Method

Coal is a sedimentary rock containing approximately 50% to 70% carbon derived from the accumulation of plant residue that had undergone chemical and physical changes. In this research, the petrographic analysis method of coal was conducted based on the following parameters, measuring vitrinite reflectance (Ro%), estimation of moisture, volatile matter, and carbon-hydrogen content. This study aims to determine the zonation of coal rank through the vitrinite reflectance analysis in Maura Enim Formation. The samples observed were obtained from the Muara Enim Formation, which had undergone certain geological events to form lignite and anthracite coal ranks, then analyzed using the descriptive method. The results showed that the reflectance value of vitrinite was between 0.20% - 0.44%, which was utilized in the sorting of coal from lignite - sub-bituminous, according to ASTM D2798-06 (2006). Furthermore, in the Southwest region, coal is formed through greater pressure than those in the Northeast. Generally, the level of difference is caused by pressure, temperature, and time factor. Therefore, this study is recommended as a guideline in determining coal rank through vitrinite reflectance analysis in different formations.

Diagenetic to incipient metamorphic zones of the Benton Uplift, Ouachita Orogen, Arkansas, USA

2019 ◽  
Vol 132 (5-6) ◽  
pp. 977-986
Author(s):  
Harold E. Johnson ◽  
David V. Wiltschko ◽  
John P. Harris
Keyword(s):  
Vitrinite Reflectance ◽  
Maximum Temperature ◽  
Burial Depth ◽  
Heat Sources ◽  
Illite Crystallinity ◽  
Pluton Emplacement ◽  
Additional Heat ◽  
Wide Range ◽  
Reflectance Analysis ◽  
The Mean

Abstract Vitrinite reflectance analysis and the mean diameter of metamorphosed quartz, suggest that the eastern Ouachita region, Arkansas, USA reached the lower greenschist facies, regardless of burial depth. An increase in “crystallinity” may explain that the maturation is from the exhumation of the rocks from a greater depth. Shale and sandstone samples collected from outcrops along the crest of the Benton Uplift exhibit illite and chlorite crystallinities that yield higher indices compared to younger rocks adjacent to this crustal-scale anticlinal structure. Illite crystallinity d(001) of air-dried, fine (<0.2 μm) authigenic clays (Δ°2θ (CuKα) = 0.417° to 0.875°) yield a range of conditions from diagenetic temperature to lower anchizone temperatures up to ∼200 °C. Air-dried, fine authigenic chlorite clays (Δ°2θ (CuKα) = 0.259° to 1.570°) yield a wide range of diagenetic to metamorphic conditions that span the diagenetic zone through epizone, which indicate a maximum temperature slightly above ∼300 °C. These results are in contrast to prior thermal maturation data. No additional heat sources, such as from pluton emplacement, were identified by major areas of anomalous high maturation based on crystallinity. Regionally, the illite and chlorite crystallinity increases toward the central axis of the Benton Uplift. Exhumation of the rocks from greater depth is all that is required to explain the illite and chlorite crystallinity data.

Thermal maturity of a fold–thrust belt based on vitrinite reflectance analysis in the Western Foothills complex, western Taiwan

2007 ◽  
Vol 443 (3-4) ◽  
pp. 220-232 ◽  
Author(s):  
Arito Sakaguchi ◽  
Akiko Yanagihara ◽  
Kohtaro Ujiie ◽  
Hidemi Tanaka ◽  
Masanori Kameyama
Keyword(s):  
Vitrinite Reflectance ◽  
Thermal Maturity ◽  
Thrust Belt ◽  
Reflectance Analysis

The Concentration of Environmentally Important Trace Elements in Permian Coals in Xinan Coalfield, Henan, China

2013 ◽  
Vol 807-809 ◽  
pp. 2215-2219
Author(s):  
Xiao Mei Wang ◽  
Yang Quan Jiao ◽  
Xiao Ming Wang ◽  
Li Qun Wu ◽  
Lei Qiao ◽  
...  
Keyword(s):  
Trace Elements ◽  
Vitrinite Reflectance ◽  
Volatile Matter ◽  
Proximate Analysis ◽  
Average Concentration ◽  
Matter Content ◽  
Potentially Hazardous Elements ◽  
Reflectance Analysis ◽  
Lean Coal ◽  
High Concentrations

The concentration of fourteen environmentally important trace elements (Be, V, Cr, Co, Ni, Cu, Zn, Mo, Sn, Ba, Tl, Pb, Th and U) was studied in thirteen coal samples from Xinan coalfield, Henan province. In addition, virtrinite reflectance analysis, proximate analysis and elemental analysis were also conducted on these samples. The vitrinite reflectance values (Ro) ranges from 2% to 2.35%, revealing that these samples are lean coal. The coals have low moisture content, with Madvalue ranging from 0.57 to 0.95%. The ash and volatile matter content vary between 8.11-22.61% and 10.36-14.64%, respectively. Carbon, hydrogen, sulphur and nitrogen content vary between 71.51-83.54%, 3.068-3.879%, 0.494-2.326% and 0.953-1.38%, respectively. In comparison with the crustal average (Clarke value), some potentially hazardous elements are moderately enriched in the coals from Xinan coalfield, such as Pb, Th, U, Sn and Mo. The average concentration of most of the elements in Xinan coalfield coals is in the range of Chinese coals and world coals. No elements with the abnormally high concentrations analyzed are found.

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