Kerogens thermal history

The kinetic parameters , , A and are used with the modeled thermal history of the source rocks to compute hydrocarbon output, using Eqs. 6.8 and 6.9, and to estimate the quantity of hydrocarbons expelled from the source rocks. The relative contributions of oil, gas, and coke to the total output of hydrocarbons are computed by using the standard three-fraction (oU, gas, and coke) and five-fraction (Cj, C -Cj, Cg-C, C15+, and coke) kinetic models for kerogen types I, II, and III (Tissot et al. 1987 Espitalie et al. 1988). 

Kerogen Decomposition. The thermal decomposition of oil shale, ie, pyrolysis or retorting, yields Hquid, gaseous, and soHd products. The amounts of oil, gas, and coke which ultimately are formed depend on the heating rate of the oil shale and the temperature—time history of the Hberated oil. There is Htde effect of shale richness on these relative product yields under fixed pyrolysis conditions, as is shown in Table 5 (10). 

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