Assessment of Thermal Maturity, Source Rock Potential and Paleodepositional Environment of the Paleogene Lignites in Barsingsar, Bikaner–Nagaur Basin, Western Rajasthan, India

Singh, Alok K.; Kumar, Alok

doi:10.1007/s11053-019-09502-8

Cited by 9 publications

(3 citation statements)

References 73 publications

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“…Organic petrography deals with the microscopically visible organic matter present in rocks and is the most effective method for determining the depositional environment, the source vegetation,and the maturation level of coal and its gas generation potential (Diessel, 1983;Flores, 2002;Kalkreuth , 1991;Latif , 2021). Many researchers have provided a thorough study of several geochemical parameters in evaluating the richness, maturity and quality of source rocks, vitrinite reflectance, maceral analysis, total organic content measurement, rock-eval pyrolysis, associations between maturity and hydrocarbon generation, as well as the depositional environment (Dow, 1977;Tissot and Welte, 1978;Thompson-Rizer, 1993;Law, 1999;Vandenbroucke and Largeau, 2007;Gogoi , 2008;Salleh , 2008;Sahoo and Gogoi, 2011;Phukan , 2013;Jahan, 2016;Sharma , 2016;Singh , 2016aSingh , -b, 2017aMathews , 2020;Gogoi , 2020Gogoi , , 2021Singh and Kumar, 2020;Singh , 2022;Kar , 2022). Quantitative and qualitative analyses of different kerogen types with the geochemical study of organic matter provide a better understanding of the generating potential (GP) of source rocks (Thompson and Dimbicki, 1986;Isabel, 2012).…”

Section: Introductionmentioning

confidence: 99%

Rock-Eval Pyrolysis and Petrographic Characteristics of Coals of Chintalapudi Sub-Basin, Pranhita-Godavari Basin, Southern India: Implication to Depositional Environment

Kiran¹,

Gogoi²

2023

JGSR

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The results of the Rock-Eval pyrolysis and petrological investigation carried out on coal samples from the Chintalapudi sub-basin of the Pranhita- Godavari basin have been discussed to identify the assessment of the maturity, type, and quantity of organic matter and interpret the depositional environment. Petrographically these coals are enriched in vitrinite (40.0%-60.7%) followed by liptinite (7.3%-26.0%) and inertinite (9.3%-24.0%) macerals.TOC concentrations range from 17.54% to 64.97%. S1 ranges from 0.30% to 1.63% and S2 ranges from 11.70% to 138.06% are considered to be good source rocks. The Tmax values of the Chintalapudi sub-basin coals are found to be between 420°C to 428°C, indicating an immature source rock for the production of oil. The coal samples have an average HI of 157 mg HC/g TOC and VRo of 0.30% placing them in the Type III gas kerogen range. HI, and OI values reveal that the samples of organic matter composition mostly follow the evolutionary route of mixed Type II/III kerogens and are contributed by terrestrial plants which is the main source of the organic matter. The GI (1.67-5.95) and TPI (2.75-47.14)values favour the existence of wet moor with moderate to severe floods with short periods of alternateoxic and anoxic moor environments due to the high concentration of vitrinite that allowed for adequate tissue preservation. Keywords: Kerogen, Rock-Eval Pyrolysis, Petrography, Chintalapudi Sub-basin

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Section: Introductionmentioning

confidence: 99%

Rock-Eval Pyrolysis and Petrographic Characteristics of Coals of Chintalapudi Sub-Basin, Pranhita-Godavari Basin, Southern India: Implication to Depositional Environment

Kiran¹,

Gogoi²

2023

JGSR

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“…The depositional environments of organic-rich fine-grained sediments can be reconstructed by the analyses of inorganic elements, organic geochemical parameters and sporopollen and algal fossils. Inorganic elements can provide comprehensive information on the paleoclimate, primary productivity, salinity, detrital input and redox conditions (Gastaldo et al, 2020; Liang et al, 2020; Liu et al, 2017; Scheffler et al, 2003; Singh and Kumar, 2020; Spiro et al, 2019; Tao et al, 2013; Wang et al, 2021; Xu et al, 2016). Organic geochemical parameters such as biomarkers are used mainly to decipher OM sources and water column properties such as salinity and redox conditions (Philip, 1985; Quan et al, 2017), whereas sporopollen and algal fossils are applied mainly to indicate paleoclimate and water column salinity.…”

Section: Introductionmentioning

confidence: 99%

The influences of sedimentary environments on organic matter enrichment in fine-grained rocks of the Paleogene Shahejie formation in Nanpu Sag, Huanghua Depression, Bohai Bay Basin

Pang

Liu

Chen

et al. 2021

Energy Exploration & Exploitation

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The fine-grained rocks in the Paleogene Shahejie Formation in Nanpu Sag, Huanghua Depression, Bohai Bay Basin, are extremely important source rocks. These Paleogene rocks are mainly subdivided into organic-rich black shale and gray mudstone. The average total organic carbon contents of the shale and mudstone are 11.5 wt.% and 8.4 wt.%, respectively. The average hydrocarbon (HC)-generating potentials (which is equal to the sum of free hydrocarbons (S1) and potential hydrocarbons (S2)) of the shale and mudstone are 39.3 mg HC/g rock and 28.5 mg HC/g rock, respectively, with mean vitrinite reflectance values of 0.82% and 0.81%, respectively. The higher abundance of organic matter in the shale than in the mudstone is due mainly to paleoenvironmental differences. The chemical index of alteration values and Na/Al ratios reveal a warm and humid climate during shale deposition and a cold and dry climate during mudstone deposition. The biologically derived Ba and Ba/Al ratios indicate high productivity in both the shale and mudstone, with relatively low productivity in the shale. The shale formed in fresh to brackish water, whereas the mudstone was deposited in fresh water, with the former having a higher salinity. Compared with the shale, the mudstone underwent higher detrital input, exhibiting higher Si/Al and Ti/Al ratios. Shale deposition was more dysoxic than mudstone deposition. The organic matter enrichment of the shale sediments was controlled mainly by reducing conditions followed by moderate-to-high productivity, which was promoted by a warm and humid climate and salinity stratification. The organic matter enrichment of the mudstone was less than that of the shale and was controlled by relatively oxic conditions.

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“…Previously, numerous techniques, including organic petrology, FT-IR, XRF, XRD, palynology, and organic geochemistry, have been used to study the chemical and structural characteristics of Indian lignite deposits to know the paleodepositional conditions and source rock characteristics (Kumar et al 2020;Singh and Kumar 2020;Mathews et al 2018Mathews et al , 2019Kumar 2017, 2018;Singh et al 2010Singh et al , 2012bSingh et al , 2015Singh et al , 2016aSingh et al , b, c, d, e, 2017aSingh et al , b, c, d, e, f, g, 2018Singh et al , 2019. Carbon isotope and NMR technique have less (Mathews et al 2020) been used to study the chemical and structural characteristics of Indian lignite deposits.…”

Section: Introductionmentioning

confidence: 99%

Paleoenvironmental, paleovegetational, and paleoclimatic changes during Paleogene lignite formation in Rajasthan, India

et al. 2021

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This study provides detailed information about the geochemistry and coal petrography of Paleogene lignite deposits of Bikaner-Nagaur Basin and the Barmer Basin of Rajasthan, India, which have been used to reconstruct paleoclimatic, paleovegetational, and paleodepositional conditions. Petrographic characteristics show the dominance of huminite group macerals followed by inertinite and liptinite group macerals in Rajasthan lignites. The mean random huminite reflectance value (%Ro m ) ranges from 0.27 to 0.33%, which put these lignites as low-rank lignite 'B'. 13C NMR spectra show sharp peaks in the aliphatic region, indicting immaturity of organic matter. These peaks confirm the presence of aliphatic CH 2 , aliphatic -CH 3 bonding, protonated aromatic carbons, and oxygenated aromatic carbon atoms (Ar-O). δ 13 C values in xylite-rich lithotype range from − 25.04 to − 25.61‰, indicating the contribution of gymnosperm plants (Taxodiaceae during) in peat. Whereas, δ 13 C in matrix-rich lithotype range from − 26.82 to − 27.44‰, and show the presence of angiosperm taxa (Typhaceae, Iridaceae, and Gramineae) during peat formation in the study area. The samples dominated by huminite group macerals have a slightly low δ 13 C value than inertinite-rich samples. In contrast, the least δ 13 C value has been recorded in the liptinite rich samples. δ 13 C values also suggest C 3 plants to be the main peat-forming vegetation in the study area during the Paleogene. The mineralogical study indicates peat formation in semi-arid to slightly arid climatic conditions. The presence of framboidal pyrite, alginite, funginite macerals, and high sulfur content of the studied lignites indicate marine incursion in the basin.

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Assessment of Thermal Maturity, Source Rock Potential and Paleodepositional Environment of the Paleogene Lignites in Barsingsar, Bikaner–Nagaur Basin, Western Rajasthan, India

Cited by 9 publications

References 73 publications

Rock-Eval Pyrolysis and Petrographic Characteristics of Coals of Chintalapudi Sub-Basin, Pranhita-Godavari Basin, Southern India: Implication to Depositional Environment

Rock-Eval Pyrolysis and Petrographic Characteristics of Coals of Chintalapudi Sub-Basin, Pranhita-Godavari Basin, Southern India: Implication to Depositional Environment

The influences of sedimentary environments on organic matter enrichment in fine-grained rocks of the Paleogene Shahejie formation in Nanpu Sag, Huanghua Depression, Bohai Bay Basin

Paleoenvironmental, paleovegetational, and paleoclimatic changes during Paleogene lignite formation in Rajasthan, India

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