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

International Journal of Coal Science & Technology

Neeraj Mathur¹  P. K. Rajak²  V. K. Singh²  Prakash K. Singh² 

[1] Centre of Excellence for Energy Studies, Oil India Limited;Coal and Organic Petrology Lab, Centre of Advanced Study in Geology, Banaras Hindu University;

关键词: Saurashtra lignite;    Reactive maceral;    Rock-Eval;    Hydrocarbon generating potential;   

DOI  :  10.1007/s40789-017-0186-x

来源: DOAJ

【 摘 要 】

Abstract 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 T max (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 T max 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.

【 授权许可】

Unknown