RESEARCH ON THE QUANTITATIVE ANALYSIS METHOD OF C₆-C₁₅ LIGHT HYDROCARBON IN SOURCE ROCK SAMPLES

Supported by the low boiling-point solvent extraction technique and the gas chromatography technique of Programmed Temperature Vaporization(PTV) cut-out and back-flow,a quantitative research has been made on the C₆-C₁₅ light hydrocarbon compounds in the source rock samples by means of an internal standard method.It is found that the light components before C₇ lose more than other hydrocarbon components in the sample pre-processing process due to the volatility differences.So 1-hexenes was chosen as an internal standard reference to assure the quantitative analysis of C₆ to C₇,and 1-nonene was chosen as an internal standard reference to assure the quantitative analysis of C₇ to C₁₅(including C₇).The results show high recovery(>85%) and good reproducibility(with RE<10%),indicating that this quantitative analysis method is stable and reliable.With this kind of analysis,not only the quantitative data of C₆-C₁₅ light hydrocarbons can be provided,the light hydrocarbon fingerprint parameters can also be offered.So it can bring rich geochemical information and has certain application values in the fields of oil and gas exploration and energy resource evaluation.