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A study on assessment of hydrocarbon potential of the lignite.deposits of saurashtra basin, Gujarat （Western India）

International Journal of Coal Science & Technology 2017年第4期4卷 310-321页

作者： Prakash K. Singh V. K. Singh P. K. Rajak Neeraj Mathur Coal and Organic Petrology Lab Centre of Advanced Studyin Geology Banaras Hindu University VaranasiUttar Pradesh 221005 India Centre of Excellence for Energy Studies Oil India LimitedRukminigaon GS Road Guwahati Assam 781022 India

In the present investigation, Bhavnagar lignite. of the saurashtra basin （Gujarat） have been studied to assess their hydrocarbon generating potential. The samples of upper as well as lower lignite.seams have been studied through microscopy and subjected to various chemical analyses viz. proximate analysis, ultimate analysis and rock-eval.Pyrolysis. These lignite. have high moisture and low to moderate ash yield but are characterized by high volatile matter. Petro- graphically they comprise predominantly of huminite group maceral while liptinite and inertinite groups occur in sub- ordinated amount. Huminite is chiefly composed of detrohuminite and telohuminite. The Tma~ （av. 416.23 ~C） and huminite reflectivity （0.28%-0.30%） indicate a low degree of maturity for these lignite. which is also substantiated by the T,n~~ versus hydrogen index plot. The organic matter is subjugated by kerogen Type-III with a potential to expel hydrocarbon on liquefaction. Study further reveals that the fixed hydrocarbon is several folds higher than the free hydrocarbons. Being high in reactive maceral content, a high ＇conversion＇ and good ＇oil yield＇ values for these lignite. were observed. Thus, the empirically derived values match well with those obtained through the experimental values of rock-eval.Pyrolysis and validate their hydrocarbon generating potential.

关键词： saurashtra lignite. reactive maceral - rock-eval. hydrocarbon generating potential

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