Pyrolysable carbon (PC) corresponds to the carbon present in the HC represented by S1 and S2.
Based on the pyrolysable hydrocarbons, S2 > 20 mg HC/g rock (Table 2), the majority of the samples have an excellent source rock potential, whereas samples D4, D6 and D7 show a good source rock potential (Table 2) [23, 27].
TOC consists mostly of
pyrolysable carbon and shows correspondingly high PY values (35.50159.32 mg HC/g rock), which implies that the Eskisehir oil shale has quite high hydrocarbon generation potential (Tables 1, 2 and 3).
Besides, the temperature at which the maximum release of hydrocarbons from cracking of kerogen occurs during pyrolysis (Tmax), and total organic carbon (TOC), hydrogen index (HI = 100S2/TOC),
pyrolysable carbon (PC) and residual carbon (RC) are determined.
(a) HI = hydrogen index (b) OI = oxygen index (c) [T.sub.max] = temperature of maximum S2 (d) [S.sub.1] = free hydrocarbons (e) [S.sub.2] =
pyrolysable hydrocarbons (f) HC = hydrocarbon.
Calculated Rock-Eval parameters and their abbreviations Unit Formula Name PI S1/(S1 + S2) Production index PC wt.% 0.1[0.83(S1 + S2)
Pyrolysable organic + 0.273S3 + carbon 0.429(S3CO + 0.5S3'CO)] TOC wt.% PC +RC Total organic carbon BI 100S1/TOC Bitumen index HI 100S2/TOC Hydrogen index OI 100S3/TOC Oxygen index RC CO wt.% 0.0428S4 CO Residual carbon organic (CO) RC wt.% 0.0273S4 CO2 Residual carbon organic C[O.sub.2] (C[O.sub.2]) RC wt.% RC CO + RC Residual carbon organic.