Geochemical and organo-petrographic characterization for hydrocarbon generation from Barakar Formation in Auranga Basin, India

Varma, Atul Kumar; Mishra, Divya Kumari; Samad, Suresh Kumar; Prasad, Anup K.; Panigrahi, Durga Charan; Mendhe, Vinod Atmaram; Singh, Bhagwan D.

doi:10.1016/j.coal.2017.12.002

Cited by 42 publications

(31 citation statements)

References 80 publications

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“…Moreover, the peaks near 1008 and 1030 cm − 1 (Fig. 5b) may represent the presence of quartz and feldspar (Varma et al 2018) in these samples. Besides, the -OH bending vibrations of the kaolinite (Fig.…”

Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 94%

“…The tted Fourier transform infrared peaks are assigned following the works of Djomgoue and Njopwouo (2013), Saikia andParthasarathi (2010), andVarma et al (2018) and the representative tted curves from the bituminous (CG 1674), and the anthracite samples (CG3303) are displayed in Fig. 5 (a-f).…”

Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 99%

“…The FTIR data reveals the absorbance intensities of mineral matter like kaolinite, quartz, feldspar, siderite, etc. (Hazra et al 2016;Varma et al 2018) present in the organic-rich source rocks.…”

Section: Introductionmentioning

confidence: 99%

“…Explanations: 1 = Surface -OH stretching vibration of kaolinite, 2 = Surface -OH stretching vibration of kaolinite, 3 = Surface -OH stretching vibration of kaolinite, 4 = Inner surface -OH stretching vibration of kaolinite, 5 = H-O-H stretching vibrations of water within montmorillonite, 6 = Quartz, 7 = Quartz, and feldspar, 8 = Surface -OH bending vibration of kaolinite, 9 = Inner surface -OH bending vibration of kaolinite, 10 = Si-O-Si inter-tetrahedral bridging bonds of SiO2, 11 = Si-O-Si inter-tetrahedral bridging bonds of SiO2, 12 = Surface -OH bending vibration of kaolinite, 13 = -OH bending vibration of montmorillonite. Peaks are assigned following the works ofDjomgoue and Njopwouo (2013),Saikia and Parthasarathi (2010) andVarma et al (2018).…”

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confidence: 99%

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Potassium-metasomatism in Anthracite: A Cluster of Geochemical Evidences

Ghosh

Ojha

Varma

2021

Preprint

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The present study focuses on the inorganic geochemical features of the bituminous coal samples from the Raniganj and the Jharia Basin, as well as the anthracite samples from the Himalayan fold-thrust belts of Sikkim, India. The SiO2 content (48.05 to 65.09 wt% in the ash yield of the bituminous coal samples and 35.92 to 50.11 wt% in the ash yield of the anthracite samples) and the ratio of Al2O3/TiO2 (6.97 to 17.03 in the bituminous coal samples and 10.34 to 20.07 in the anthracite samples) reveal the intermediate igneous source rock composition of the minerals. The ratio of the K2O/Al2O3 in the ash yield of the bituminous coal samples (0.03 to 0.09) may suggest the presence of kaolinite mixed with montmorillonite, while its range in the ash yield of the anthracite samples (0.16 to 0.27) may imply the presence of illite mixed with kaolinite. The chemical index of alteration values may suggest the moderate to strong chemical weathering of the source rock under sub-humid to humid climatic conditions. The plot of the bituminous coal samples in the A-CN-K diagram depicts the traditional weathering trend of parent rocks, but the anthracite samples plot near the illite field and are a bit offset from the weathering trend. This may imply the plausible influences of the potassium-metasomatism at post coalification stages. The Fourier transform infrared spectra further reveal the hydroxyl stretching intensity of the illite in the anthracite samples substantiating the effect of the epigenetic potassium-metasomatism. The decrease in total kaolinite intensity/compound intensity of quartz and feldspar may provide additional evidence towards this epigenetic event.

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Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 94%

Section: Fourier Transform Infrared (Ftir) Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Potassium-metasomatism in Anthracite: A Cluster of Geochemical Evidences

Ghosh

Ojha

Varma

2021

Preprint

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“…The different ranks of coal, mineral matter and maceral composition significantly influence the methane sorption capacity (Goraya et al 2019;Moore et al 2014). The literature reveals that Fourier transform infrared spectroscopy (FTIR) is extensively employed to characterize various source rocks to determine hydrocarbon generation potential (Ganz and Kalkreuth 1991;Mishra et al 2018;Varma et al 2018). The FE-SEM and EDX analysis were significantly used for organic matter association with mineral matter and coal surface structure.…”

Section: Introductionmentioning

confidence: 99%

Geochemical investigation of hydrocarbon generation potential of coal from Raniganj Basin, India

Panwar

Chaurasia

Saxena

et al. 2021

J Petrol Explor Prod Technol

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Methane content in a coal seam is a necessary parameter for evaluating coal bed gas, and it poses an environmental risk to underground coal mining activities. Keeping in pace with comprehensive studies of coal bed gas, 12 coal samples were selected from the Sitarampur block of Raniganj Coalfield for analysis. The Petrographic examination illustrated that significant values of reactive macerals present in samples demonstrate that organic matter is dominated by the prominent source of aromatic hydrocarbons with a minor proportion of aliphatic hydrocarbon, which falls in the region of (Type III) kerogen, confirms the suitability for the potential of hydrocarbon generation. “A” factor (aliphatic/aromatic bands) and “C” factor (carbonyl/carboxyl bands) value concluded that the sample has the lowest aromaticity and the highest hydrocarbon-generating potential, which was also validated by the Van Krevelen diagram. The Van Krevelen diagram plots between the H/C and O/C ratio indicate that coal samples lie in the type III kerogen, and bituminous coal (gas prone zone) is present in the block, which is confirmed by the cross-plot between desorbed and total gas (cc/g). The in situ gas content values are high enough to produce methane from coal beds. The overall study concludes that the Sitarampur block from Raniganj Coalfield is suitable for hydrocarbon generation and extraction.

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