Organic Chemistry: Current Research
Open Access
ISSN: 2161-0401
+44 1478 350008
ISSN: 2161-0401
+44 1478 350008
Jian Li, Proffer and Aisheng Hao
RIPED, China
Posters & Accepted Abstracts: Organic Chem Curr Res
Sterane and terpane are important and effective biomarkers of hydrocarbon generating material, source rock evolution history, paleo-sedimentary environment and hydrocarbon migration. They can offer information about hydrocarbon source rock, hydrocarbon migration and accumulation and hydrocarbon alteration. However, the sterane and terpane are very low in natural gas and affected significantly by sample collection, sample preservation and pretreatment and contamination. Freezing method is the best detection method of sterane and terpane with little contamination, simple process and little gas. Analysis on the experiment results indicates that C19 tricycle terpane/C23 tricycle terpane and C26 tricycle terpane/C24 tetraterpane are effective indexes which can indicate organic matter of source rock. C19 tricycle terpane refer to higher plants, while C23 tricycle terpane indicates marine organic matter. Higher value of C19 tricycle terpane/ C23 tricycle terpane indicates that the organic matter of source rock is higher plant. C24 tetraterpane may indicate the source rock is related with carbonate or evaporate. C19 tricycle terpane/C23 tricycle terpane is high in coal gas. C19 tricycle terpane/C23 and C26 tricycle terpane/ C24 tetraterpane are both low in natural gas derived from marine carbonate. The higher the value of C27 sterane, the better the type of organic matter of source rock is. C27 sterane is low (about 15%) in coal gas and high (about 25%) in natural gas derived from marine carbonate or other type I organic matter. The isotope, sterane and terpane of natural gas samples of known source are tested. They refer to the same organic matter of source rock. In all, sterane and terpane are effective indexes of gas source correlation.
Email: lijian69@petrochina.com.cn