Changes

Gross trends of hydrogen indices (HIs) can be used as a maturation indicator. The hydrogen index is calculated from Rock-Eval data using the following formula:

Gross trends of hydrogen indices (HIs) can be used as a maturation indicator. The hydrogen index is calculated from Rock-Eval data using the following formula:

:<math>\mbox{HI} = \mbox{S2} \mbox{ (mg/g)}/\%\mbox{TOC} \times 100</math>

:<math>\mbox{HI} = \mbox{S2} / \mbox{TOC} \times 100</math>

where [[S2]] is the amount of hydrocarbons generated through thermal cracking of nonvolatile organic matter in mg/g of rock and [[Total organic carbon (TOC)|TOC]] is total organic carbon in %.

where [[S2]] is the amount of hydrocarbons generated through thermal cracking of nonvolatile organic matter in mg/g of rock and [[Total organic carbon (TOC)|TOC]] is total organic carbon in %.