GEOCHEMICAL CHARACTERISTICS OF STERANES IN SATURATEDHYDROCARBONS FROM COAL AND EXINITE IN PYROLYSISUNDER CLOSED SYSTEMS
Received date: 2006-12-19
Revised date: 2007-02-02
Online published: 2008-06-20
According to the GC-MS analysis of soluble organic matters extracted from coal and exinite heated in closed system pyrolysis, one characteristic feature of allsamples is the abundance of steranes in saturated hydrocarbon fractions with the maximum intensities of C29-regular steranes. The detection of high content αββ steranes from coal suggests the coal would be biodegraded during the early diagenesis, the soluble organic matter can be subdivided into immature andmature by using the relationship between C29 sterane-20S/(20S+20R) and C29 sterane-ββ/(ββ+αα) ratios. The Σpregnane/Σregular-sterane ratios in SOM during pyrolysis infer that the regular steranes would not be the precursors of pregnanes. The open ring and cleavage of steroid frameworks occurs according to the onset of the Σdiasteranes/Σregular-sterane decrease and the maximum ratios of C29αα20R/C27αα20R at the temperature of 400℃.
Key words： Tarim basin; Coal; Exinite; Pyrolysis; Steranes
LIU Quan-you;LIU Wen-hui;MENG Qian-xiang . GEOCHEMICAL CHARACTERISTICS OF STERANES IN SATURATEDHYDROCARBONS FROM COAL AND EXINITE IN PYROLYSISUNDER CLOSED SYSTEMS[J]. Natural Gas Geoscience, 2007 , 18(2) : 249 -253 . DOI: 10.11764/j.issn.1672-1926.2007.02.249
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