Changes

[[Maturation|Maturity]] of a homogeneous source section can be accessed from the production index (PI). PI is calculated from [[Rock-Eval]] data:

[[Maturation|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{S1}/(\mbox{S1} + \mbox{S2})</math>

:<math>\mbox{PI} = \frac{\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>.