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 %. |