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| ! Comment | | ! Comment |
| |- | | |- |
− | | S<sub>1</sub> mg Hc/g rock | + | | S1 mg Hc/g rock |
| | The free hydrocarbons present in the sample before the analysis | | | The free hydrocarbons present in the sample before the analysis |
− | | Can be thought of as a residual hydrocarbon phase. When S<sub>1</sub> is large relative to S<sub>2</sub> , an alternative source such as migrated hydrocarbons or contamination should be suspected | + | | Can be thought of as a residual hydrocarbon phase. When S1 is large relative to S2, an alternative source such as migrated hydrocarbons or contamination should be suspected |
| |- | | |- |
− | | S<sub>2</sub> mg Hc/g rock | + | | S2 mg Hc/g rock |
| | The volume of hydrocarbons that formed during thermal pyrolysis of the sample | | | The volume of hydrocarbons that formed during thermal pyrolysis of the sample |
| | Used to estimate the remaining hydrocarbon generating potential of the sample | | | Used to estimate the remaining hydrocarbon generating potential of the sample |
| |- | | |- |
− | | S<sub>3</sub> mg Co2/g rock | + | | S3 mg Co2/g rock |
| | The CO<sub>2</sub> yield during thermal breakdown of kerogen | | | The CO<sub>2</sub> yield during thermal breakdown of kerogen |
| | Most prevalent in calcareous source rocks. | | | Most prevalent in calcareous source rocks. |
| |- | | |- |
− | | S<sub>4</sub> mg carbon/g rock | + | | S4 mg carbon/g rock |
| | The residual carbon content of the sample | | | The residual carbon content of the sample |
| | Residual carbon content of sample has little or no potential to generate hydrocarbons due to a lack of hydrogen and the chemical structure of the molecule | | | Residual carbon content of sample has little or no potential to generate hydrocarbons due to a lack of hydrogen and the chemical structure of the molecule |