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Maturity of a homogeneous source section can be accessed from the production index (PI). PI is calculated from Rock-Eval data:
Maturity of a homogeneous source section can be accessed from the production index (PI). PI is calculated from Rock-Eval data:
:<math>\mbox{PI} = \mbox{S}_{1}/(\mbox{S}_{1} + \mbox{S}_{2})</math>
:<math>\mbox{PI} = \mbox{S1}/(\mbox{S1} + \mbox{S2})</math>
where S1 is the quantity of free hydrocarbons (gas + oil), in mg/g of rock and S2 is the quantity of thermally generated (cracked) hydrocarbons, in mg/g of rock <ref name=NL Oil and Gas Portal>[http://www.nlog.nl/en/activity/analyses.html NL Oil and Gas Portal]</ref>.
where S1 is the quantity of free hydrocarbons (gas + oil), in mg/g of rock and S2 is the quantity of thermally generated (cracked) hydrocarbons, in mg/g of rock <ref name=NL Oil and Gas Portal>[http://www.nlog.nl/en/activity/analyses.html NL Oil and Gas Portal]</ref>.