New insight into geochemical characterization of Paleogene coals from Jarain coalfield, Meghalaya, N-E India: Hydrocarbon potential and organic petrographic analysis
“… Figure 8 Ternary diagrams of maceral composition indicating ( a ) kerogen types (After Ref. 50 ), ( b ) hydrocarbon type (after Ref. 79 ), ( c ) plot of OI vs HI, ( d ) plot of TOC vs S2, ( e ) Plot of TOC vz Py, ( f ) relationship between TOC and HI.…”
Section: Resultsmentioning
confidence: 99%
“…The thermal maturity is measured using the procedures of ASTM 49 to calculate the vitrinite reflectance (R o %). The maceral content, especially reactive macerals (RM), can be used to determine oil yield and conversion of coal into hydrocarbon 50 , 51 using the following formulas 52 . …”
The energy demand increased dramatically owing to the evolution of industrial and domestic requirements and the associated decrease in oil and gas resources. This study aims to evaluate El-Maghara coal (with about 52 MT reserve) as a potential hydrocarbon source. The collect samples were subjected to petrographic, chemical analyses and Rock–Eval pyrolysis to investigate the detailed characteristics of this coal. Chemically, this coal is high volatile bituminous coal with high H and S content. The high H/C ratio indicates the high extraction yield of coal. The main maceral group in the studied samples is vitrinite (62.8%) followed by liptinite (31.3%) and inertinite (5.8%). The content of liptinite indicates the capability of this coal for petroleum production. Based on Rock–Eval Pyrolysis results and TOC content, the coal has excellent petroleum potential. The hydrogen index (HI) and H/C atomic ratio indicate the II kerogen type (oil prone) of this coal. This coal has Tmax and vitrinite reflectance values around 415.8 °C and 0.37%, respectively, indicating the immature stage of kerogen. The high reactive maceral content (94.2%), oil-yield (65.5%) and conversion from coal to oil (95.4%), indicated that this coal has a hydrocarbon generation potential for oil.
“… Figure 8 Ternary diagrams of maceral composition indicating ( a ) kerogen types (After Ref. 50 ), ( b ) hydrocarbon type (after Ref. 79 ), ( c ) plot of OI vs HI, ( d ) plot of TOC vs S2, ( e ) Plot of TOC vz Py, ( f ) relationship between TOC and HI.…”
Section: Resultsmentioning
confidence: 99%
“…The thermal maturity is measured using the procedures of ASTM 49 to calculate the vitrinite reflectance (R o %). The maceral content, especially reactive macerals (RM), can be used to determine oil yield and conversion of coal into hydrocarbon 50 , 51 using the following formulas 52 . …”
The energy demand increased dramatically owing to the evolution of industrial and domestic requirements and the associated decrease in oil and gas resources. This study aims to evaluate El-Maghara coal (with about 52 MT reserve) as a potential hydrocarbon source. The collect samples were subjected to petrographic, chemical analyses and Rock–Eval pyrolysis to investigate the detailed characteristics of this coal. Chemically, this coal is high volatile bituminous coal with high H and S content. The high H/C ratio indicates the high extraction yield of coal. The main maceral group in the studied samples is vitrinite (62.8%) followed by liptinite (31.3%) and inertinite (5.8%). The content of liptinite indicates the capability of this coal for petroleum production. Based on Rock–Eval Pyrolysis results and TOC content, the coal has excellent petroleum potential. The hydrogen index (HI) and H/C atomic ratio indicate the II kerogen type (oil prone) of this coal. This coal has Tmax and vitrinite reflectance values around 415.8 °C and 0.37%, respectively, indicating the immature stage of kerogen. The high reactive maceral content (94.2%), oil-yield (65.5%) and conversion from coal to oil (95.4%), indicated that this coal has a hydrocarbon generation potential for oil.
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