Maturation study of vitrinite in carbonaceous shales and coals: Insights from hydrous pyrolysis

Mishra, Divya Kumari; Hackley, Paul C.; Jubb, Aaron M.; Sanders, Margaret M.; Agrawal, Shailesh; Varma, Atul Kumar

doi:10.1016/j.coal.2022.104044

Cited by 12 publications

(2 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The significant reduction in HI values in higher pyrolysis temperatures may be related to the conversion of labile H-rich liptinitic organic components . The production index (PI = S 1 /(S 1 + S 2 )) is a thermal maturity proxy and PI > 0.10 is a remarker as the source rock entered the peak oil window . The original PI values for shale 22-8 and 23-10 and mudstone 37-5 and 27-8 are 0.09, 0.07, 0.05, and 0.12, respectively (Figure b), indicating samples under the immature to mature stage .…”

Section: Resultsmentioning

confidence: 99%

“…48 The production index (PI = S 1 /(S 1 + S 2 )) is a thermal maturity proxy and PI > 0.10 is a remarker as the source rock entered the peak oil window. 49 The original PI values for shale 22-8 and 23-10 and mudstone 37-5 and 27-8 are 0.09, 0.07, 0.05, and 0.12, respectively (Figure 5b), indicating samples under the immature to mature stage. 50 After 345 °C, the PI of pyrolyzed samples increased dramatically; this indicates that the samples entered the main oil generation stage (Figure 5b).…”

Section: Rock-eval Pyrolysismentioning

confidence: 99%

See 1 more Smart Citation

Effect of Petroleum Generation and Retention on Nanopore Structure Change in Laminated and Massive Shales─Insights from Hydrous Pyrolysis of Lacustrine Source Rocks from the Permian Lucaogou Formation

Yang

Xiang

et al. 2023

ACS Omega

View full text Add to dashboard Cite

The lacustrine shale of the Middle Permian Lucaogou Formation in the Jimusar Sag is the principal prospective unconventional target in the Junggar Basin. The effect of petroleum generation and retention on nanopore structure change during thermal maturity in lacustrine shale is still unclear. In this study, two laminated and two massive shale samples from the Permian Lucaogou Formation were selected to study this change by closed hydrous pyrolysis. The pyrolysis temperatures were 295, 320, 345, 370, and 400 °C, which cover from the mature to the post-mature stage. Total organic carbon (TOC), Rock-Eval, and low-pressure N2 adsorption tests on pyrolyzed shale samples before and after extractable organic matter (EOM) extraction were conducted systematically. The results indicate that (1) the petroleum generation on nanopore structure change is in stages. The peak nanopore volume expanding stage is the late oil window (R o = 0.9–1.35%). At the post-mature stage (R o > 1.35%), the mesopore volume decreased and the majority of the nanopore space is from macropores. (2) The presence of EOM decreased both mesopores and macropores in the peak oil window. (3) The organic-rich laminated shale generated more macropores than massive shale with increasing thermal maturity. The results of this study shed light on the dynamic effect of laminae fabric, petroleum generation, and retention on shale nanopore structure change across the oil window.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Rock-eval Pyrolysismentioning

confidence: 99%

Effect of Petroleum Generation and Retention on Nanopore Structure Change in Laminated and Massive Shales─Insights from Hydrous Pyrolysis of Lacustrine Source Rocks from the Permian Lucaogou Formation

Yang

Xiang

et al. 2023

ACS Omega

View full text Add to dashboard Cite

show abstract

Evaluation of Singrauli Coals for Sustainable Energy Utilisation: Insight From Geochemical and Petrographic Perspectives

Gopinathan,

Mahato,

Kumar

et al. 2024

Geological Journal

View full text Add to dashboard Cite

The study investigated 50 Permian coals from the Singrauli Coalfields in the Son Valley Basin, India, using advanced petro‐geochemical techniques to assess their source rock properties, energy and utilisation potential and to reconstruct the paleodepositional environment. Petrological analysis indicated vitrinite reflectance values between 0.39% and 0.49%, classifying the Singrauli coals as sub‐bituminous to high volatile bituminous rank and indicating a thermally immature state. The results of geochemical analysis (volatile matter: 36.8%–46.5% and Tmax: 420°C–425°C) further support the above contention. High carbon content (average 77.89%), low sulphur content (average 0.46%) and varying nitrogen and oxygen levels in studied coal enhance its environmental suitability. The hydrogen index (HI: 163–279 mg HC/g TOC) values suggest a predominance of type‐III kerogen with mixed type‐II–III kerogen, further supported by petrographic data. Moreover, geochemical and petrographic data suggested the suitability of Singrauli coals for gasification. The high total organic carbon (TOC ≥ 38 wt%) indicated admirable potential as a source rock for hydrocarbon generation, particularly within the gas‐source rock zone, highlighting their suitability for energy production. Petrographic indices indicated a wet forest swamp origin with a telmatic source and bog region under ombrotrophic to mesotrophic hydrological circumstances. The association of macerals and total sulphur content further supported the conclusion of a freshwater environment during peat deposition.

show abstract

Comprehensive geospatial mapping and monitoring of an eastern coalfield in India

Kumar,

Choudhary,

Kumar

et al. 2024

Discov Geosci

View full text Add to dashboard Cite

Geospatial mapping and monitoring are crucial for designing slopes in opencast mining, as failure can result in significant economic and life loss. To overcome these issues, the present investigation evaluated the Digital Elevation Model (DEM) generated using high resolution Cartosat-1 satellite imagery. Simultaneously, mapping of shaded relief map, aspect map and slope maps was done for the monitoring of Shatabdi opencast coal mine of Jharia region, an eastern coalfield region of India. Shaded relief map was categorized in to low, moderate and high categories and maximum area was covered by moderate to high shades. The constructed aspect map encompasses the range between 0 and 360 degrees of direction, with categorization and representation through distinct colors. The slope map was classified into various categories based on degrees of slope, including very gentle, gentle, moderate, moderately steep, steep, and very steep slopes. The maps were ground validated using Differential Global Positioning System (DGPS) collected data points by field visit in the region. For opencast mines to operate safely and profitably, slope stability in different stages of mining must be mapped and monitored. The study synthesizes data from diverse sources, highlighting the role of geospatial technology in addressing multiple research gaps within the mining industries prior to leveraging Cartosat-1 satellite data. Slope mapping and monitoring of coalfield regions are crucial to reducing construction costs, mitigation of natural hazard risks like flooding and landslides, and effective conservation of natural resources such as soils, vegetation, and water systems. The present study benefits policymakers, environmental planners and government in formulating policies to ensure safety, reliability, and enhance the economic growth of workers and the country.

show abstract

Maturation study of vitrinite in carbonaceous shales and coals: Insights from hydrous pyrolysis

Cited by 12 publications

References 67 publications

Effect of Petroleum Generation and Retention on Nanopore Structure Change in Laminated and Massive Shales─Insights from Hydrous Pyrolysis of Lacustrine Source Rocks from the Permian Lucaogou Formation

Effect of Petroleum Generation and Retention on Nanopore Structure Change in Laminated and Massive Shales─Insights from Hydrous Pyrolysis of Lacustrine Source Rocks from the Permian Lucaogou Formation

Evaluation of Singrauli Coals for Sustainable Energy Utilisation: Insight From Geochemical and Petrographic Perspectives

Comprehensive geospatial mapping and monitoring of an eastern coalfield in India

Contact Info

Product

Resources

About