Biomarker Evidence of Shifts in Organic Provenance and Depositional Environments of Eocene Carbonaceous Rocks from Petroliferous Barmer Basin, Western Rajasthan, India
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ABSTRACT The Barmer Basin of Rajasthan in western India is a proven sedimentary basin with significant oils and natural gas reserves. The basin also possesses lignites and interbedded shales, which are organically-rich and lie close to early mature thermal window. Previous studies have demonstrated that these carbonaceous rocks can be converted into into various hydrocarbon products. We characterise the sedimentary biomarkers and stable carbon isotopes from the Eocene carbonaceous rocks of the Giral lignite mine in the Barmer basin to understand their organic provenance and the depositional environments. Different biomarker ratios of alkanes, hopanes and steranes viz., CPI, OEP, Paq, TAR, TMD, Pr/Ph, LMWH/HMWH, Pr/n-C17, Ph/n-C18, Ts/Tm and C31 22S/ (22S+22R) along withn-alkane chromatogram, several bivariate plots, sterane ternary diagram and stable carbon isotope characterize the depositional environment and different types of organic matter (OM) inputs. The Giral lignites deposited in a terrestrial environment fluctuated from oxic to dysoxic with bimodal OM input. The shales were deposited in a marine or lacustrine environment with predominantly aquatic OM input, in contrast to lignites. Shaly lignites show an intermediate depositional environment between lignite and shales and pseudo-bimodal OM input. Sea-level fluctuations led to deposition of various lithotypes under changing depositional environments. Shales and shaly lignites, unlike lignites, exhibit better preservation conditions due to a predominantly anoxic sulphidic environment. The reduced carbon content of shales may be due to a quicker subsidence rate of the basin than peat formation during shale deposition.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Biomarker Evidence of Shifts in Organic Provenance and Depositional Environments of Eocene Carbonaceous Rocks from Petroliferous Barmer Basin, Western Rajasthan, India
- Date Crossref
- 01/01/2025
- Éditeur
- Geological Society of India
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
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National Geophysical Research Institute pays non établi dans la noticeStructure de recherche
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University of Hyderabad Ocean and Atmospheric Sciences (CEOAS) pays non établi dans la noticeUniversité ou école supérieure
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Indian Institute of Chemical Technology Analytical and Structural Chemistry Department pays non établi dans la noticeStructure de recherche
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Indian Institute of Technology Bombay Department of Earth Sciences pays non établi dans la noticeUniversité ou école supérieure
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Indian Institute of Technology Dhanbad pays non établi dans la noticeUniversité ou école supérieure
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Center for Earth pays non établi dans la noticeInstitution
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Analytical and Structural Chemistry Department 3 pays non établi dans la noticeInstitution
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Department of Earth Sciences 4 pays non établi dans la noticeInstitution
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Indian Institute of Technology (ISM) Dhanbad 5 Department of Applied Geophysics pays non établi dans la noticeStructure de recherche
National Geophysical Research Institute, Ocean and Atmospheric Sciences (CEOAS) — University of Hyderabad et Analytical and Structural Chemistry Department — Indian Institute of Chemical Technology, avec 7 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.