Characteristics of biomarker in source rocks of Linxi Formation in Taohaiyingzi region, Zhalute basin

Based on gas chromatography and gas chromatography mass spectrometry techniques, the authors researched biomarker characteristics of the Linxi Formation source rocks in the area of Taohaiyingzi, and analyzed the information and petroleum geological significance that were indicated by source of organ...

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Bibliographic Details
Published in:Acta geochimica 2015-09, Vol.34 (3), p.338-345
Main Authors: Liu, Li, Tang, You-jun, Jiang, Xing-chao
Format: Article
Language:English
Subjects:
Algae
Bacteria
Basins
Biomarkers
Chromatography
Earth and Environmental Science
Earth Sciences
Formations
Gas chromatography
Geochemistry
Hydrocarbons
Mass spectrometry
Organic matter
Original Article
Rocks
Saline water
Saturated hydrocarbons
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Summary:Based on gas chromatography and gas chromatography mass spectrometry techniques, the authors researched biomarker characteristics of the Linxi Formation source rocks in the area of Taohaiyingzi, and analyzed the information and petroleum geological significance that were indicated by source of organic matter, sedimentary environment, maturity and so on. Gas chromatography peak of saturated hydrocarbons from Linxi Formation source rocks showed “the former peak” of the single peak distribution and the C 23 -dominant main peak. This indicates that the main source of organic matter was mixed organic matter; Pr/Ph ratios ranged from 0.3 to 0.6, indicating a strongly reducing sedimentary environment. Molecular fossil assemblages in Linxi Formation source rocks were abundant in tricyclic terpane with long side chains, had high level of gammacerane, and showed dominant distribution of C 27 steranes. Gammacerane ratios range from 0.15 to 0.29, with an average of 0.19, implying that Linxi Formation hydrocarbon source rocks were formed in the environment of micro-saltwater water to half-saltwater water. The hopanes/steranes ratios are mainly between 0.6 and 1.0, with an average of 0.84, implying that bacteria and algae had almost the same contribution to organic matter. C 27 steranes abundance is high and the ratio of C 27 steranes/C 29 steranes is 1.13, showing that algae is the main source of hydrocarbon precursors.
ISSN:1000-9426
2096-0956
1993-0364
2365-7499
DOI:10.1007/s11631-015-0040-z