松辽盆地滨北西部上二叠统林西组烃源岩生物标志化合物的特征及意义

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Abstract The characteristics of biomarker compounds in the source rocks of Upper Permian Linxi Formation are studied, as well as the sources, sedimentary environment and thermal evolution degree of organic matter, based on the gas chromatography and gas chromatography-mass spectrometry. The results show that the source rocks, with organic matter Type II, have high organic abundance in the high mature-overmature evolution stage. The (C₂₀+C₂₁)/(C₂₃+C₂₄) tricyclic terpane is 0.12-0.86 (averagely 0.50). The C₂₄ tetracyclic terpene/C₂₆ tricyclic terpene is 0.41-0.72 (averagely 0.54), with the characteristics of typical lacustrine source rocks. The Pr/Ph is mainly 0.16-0.71 (averagely 0.32), indicating a strong reduction-reduction sedimentary environment. The gammacerane/C₃₀ hopane is 0.09-0.35 (averagely 0.21), reflecting the brackish water sedimentary environment. The relation between Pr/nC₁₇ and Ph/nC₁₈, and interrelation of C₂₇-C₂₈-C₂₉ steranes show that the organic matters are the mixed sources of higher plants with lower aquatic organisms like bacteria and algae. The Ts/Tm ratio of 0.18-1.03 (averagely 0.86) and C₃₁αβ22S/(22S+22R) ratio of 0.53-0.62 (averagely 0.58) both show the source rock maturity is high. From the above, it is concluded that the source rocks were formed in the reduction-strong reduction environment of brackish water, and the mixed sources are favorable for the enrichment of organic matters, thus the Linxi Formation has oil-gas exploration prospects.

Key words： Songliao Basin Binbei area Upper Permian Linxi Formation source rock biomarker compound

Received: 01 March 2019 Published: 05 November 2019

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	ZHANG Jian
	SUN Lei
	HE Da-xiang
	ZHANG Hai-hua
	ZHENG Yue-juan
	ZHANG De-jun

Cite this article:

ZHANG Jian,SUN Lei,HE Da-xiang等. BIOMARKER COMPOUNDS IN THE SOURCE ROCKS OF UPPER PERMIAN LINXI FORMATION IN WESTERN BINBEI AREA, SONGLIAO BASIN: Characteristics and Implications[J]. GEOLOGY AND RESOURCES, 2019, 28(4): 350-357.

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http://manu25.magtech.com.cn/Jweb_dzyzy/EN/ OR http://manu25.magtech.com.cn/Jweb_dzyzy/EN/Y2019/V28/I4/350

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