论文部分内容阅读
In the present investigation,Bhavnagar lignites 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 lignites have high moisture and low to moderate ash yield but are characterized by high volatile matter.Petrographically they comprise predominantly of huminite group maceral while liptinite and inertinite groups occur in subordinated amount.Huminite is chiefly composed of detrohuminite and telohuminite.The Tmax (av.416.23 C) and huminite reflectivity (0.28％-0.30％) indicate a low degree of maturity for these lignites which is also substantiated by the Tmax 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 lignites 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.