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| GEOCHEMISTRY OF THE SOURCE ROCKS FROM JIUFOTANG FORMATION IN JD1 WELL, SOUTHWESTERN SONGLIAO BASIN |
| SUN Lei1, BIAN Xiong-fei1, HE Da-xiang2, ZONG Wen-ming1, HUANG Xin1, ZENG Zhen3, ZHANG Jian1, SU Fei1 |
1 Shenyang Center of Geological Survey, CGS, Shenyang 110034, China;
2 Key Laboratory of Education Ministry for Oil-Gas Resources and Exploration Technology/Department of Geochemistry, Yangtze University, Wuhan 430100, China;
3 China Aerospace Academy of Architectural Design and Research Co., Ltd, Beijing 100162, China |
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Abstract Through systematic evaluation on the organic geochemical and biomarker compound features of source rocks from Jiufotang Formation in JD1 well in Jinbaotun-Jargalang region of southwestern Songliao Basin, the authors conclude that the dark mudstone belongs to poor-medium grade source rocks with organic matter of II-type kerogen in low maturity-maturity stage. The n-alkanes are dominated by unimodal distribution of "front type" with main peak carbon numbers of C18 and C19. The odd-even predominance is not prominent. The Pr/Ph ratios(0.24-0.46) and gammacerane indexes (0.11-0.32) indicate the source rocks were formed under reduction condition with freshwater-brackish water lacustrine sedimentary environment. The distribution characteristics of C27-C28-C29 regular steranes are slightly various, reflecting mixed sources of organic matters. From the above, the source rocks in the study area have certain hydrocarbon generation potential.
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Received: 16 March 2018
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2018, Vol. 27 
