Thermal Effect on the Distribution of Regular Sterane and Geological Significance
| Autor: | Min Zhang, Julin Chen, Yunfei Yang, Xiaohui Chen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Maturity (geology)
Thermal effect Mineralogy Tarim basin 010402 general chemistry 010502 geochemistry & geophysics 01 natural sciences 0104 chemical sciences Sterane chemistry.chemical_compound Paleontology Mature stage Linear relationship chemistry Thermal simulation Geology 0105 earth and related environmental sciences |
| Zdroj: | Open Journal of Yangtze Oil and Gas. :249-259 |
| ISSN: | 2473-1900 2473-1889 |
| DOI: | 10.4236/ojogas.2017.24020 |
| Popis: | In order to study thermal effect on distribution characteristics of regular sterane in humic coals, a suit of 25 coals derived from Kuqa Depression in Tarim Basin and Ordos Basin are studied to investigate the distribution of regular sterane in different maturity, which mainly discusses the thermal effect. The results show that the C27ααα/C29ααα regular sterane ratio has a linear relationship with Ro (tmax) and aromatic hydrocarbon maturity parameters in the coals from mature to high-mature stage. It suggests that the distribution of the C27, C29regular steranes will fail to reflect original source input in high evolutionary stage. On the basis of thermal simulation experiment results, it further proves that the distribution patterns result from the demethylation effect of C29 sterane in the mature to high mature evolution stage and the C27ααα/C29ααα regular sterane increases with increasing maturity. The breakage of C-C key in branched chain from C27, C29 regular steranes to make C27ααα/C29ααα regular sterane ratio invariance at high and over mature stage. Therefore, the ratio can be used to distinguish the maturity in high and over mature stage. |
| Databáze: | OpenAIRE |
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