Geochemical Characteristics of the Source Rocks from Wunan Lücaotan area in Qaidam Basin
Received date: 2012-05-04
Revised date: 2012-07-06
Online published: 2012-08-10
According to abundance and type of organic matter and its thermal maturity,we consider that the upper and lower sections of lower Ganchaigou Formation belonged to good and better source rock.The biomarker features of n-alkenes for source rocks show an even-to-odd (15-19) and odd\|to\|even (25-29) predominance.Terpenoids are characterized as high γ-and tricyclic diterpene,low γ-and tricyclic diterpene,low abundance of C34and C35hopanes,and C27>C29 or C29>C27 for steranes.All of geochemical parameters suggest that the organic matter was derived from aquatic organisms and higher plants in the transition zone between deep and shallow lacustrine depositional settings.It should be noted that the occurrence of one terphenyl compounds in the aromatic hydrocarbons from 5 source rocks (Lücan 1 well) sampling at different depth,and the relative abundance of each isomers is positively related to thermal maturity,20S/(20S+20R) ratio of C29 steranes,and RO values.So the relative abundance of each isomer would be a potential parameter for indicating thermal maturity of organic matter.
Key words： Qaidam basin; Wunan-Lücaotan area; Source rock; Biomarkers; Terphenyls
ZHANG Ming-feng, TUO Jin-cai, ZHANG Xiao-jun, WU Chen-jun, CHEN Ru, GUO Li-jun . Geochemical Characteristics of the Source Rocks from Wunan Lücaotan area in Qaidam Basin[J]. Natural Gas Geoscience, 2012 , 23(4) : 636 -645 . DOI: 10.11764/j.issn.1672-1926.2012.04.636
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