By applying the hydrogen index values obtained from S2 versus TOC graph and mass balance calculations obtained from the results of Rock-Eval pyrolysis, the original hydrocarbon generative capacity and the amounts of the hydrocarbons generated are estimated. For calculations and comparison, two methods were applied (Claypool et al. 1998 and Schmoker 1994) for 30 organic rich samples representative Kharita and Khatatba formations, from wells IF 37-7 and S. Dabaa 11-1. Such formations are characterized by gas/oil prone source rock (Type III/II kerogen) with different thermal maturities. Calculation results indicate that the amounts of original hydrocarbons and the hydrocarbon generative capacities of the two methods are similar and not correlated with the results of the Rock-Eval pyrolysis.
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