| 藏北高原双湖地区中侏罗统海相油页岩生物标志化合物分布特征及其意义 |
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| 引用本文： | 林金辉,伊海生,等.藏北高原双湖地区中侏罗统海相油页岩生物标志化合物分布特征及其意义[J].沉积学报,2001,19(2):287-292. |
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| 作者姓名： | 林金辉 伊海生 |
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| 作者单位： | 1 成都理工学院测试中心 成都 610059; |
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| 基金项目： | 国家重点基础研究发展计划项目“青藏高原形成演化及其环境、资源效应”!(编号 :G1 9980 4 0 80 15)，有机地球化学国家重点实验室项目!( |
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| 摘 要： | 重点报道了藏北双湖地区中侏罗统海相油页岩的生物标志化合物特征,首次在该层位油页岩中检出丰富的正烷烃、类异戊二烯烷烃、萜类化合物及甾类化合物。正烷烃图谱呈单峰形,nC15、nC16或nC17为主峰碳,轻烃组份占有绝对优势,OEP值 0.93～ 1.0 1,无明显的奇偶碳数优势分布;Pr/Ph值为 0.77～ 1.5 9,在剖面序列中呈波动分布,显示弱植烷优势或姥鲛烷优势;藿烷以C30 占优势,萜烷相对丰度五环三萜烷 >三环萜烷 >四环萜烷;规则甾烷∑ (C27+C28) >∑C29,∑C27/∑C29值为 0.79～ 1.2 0,在剖面序列中下部C27甾烷略占优势,上部C29甾烷略占优势,重排甾烷C27/规则甾烷C27值为 0.5 1～ 3.6 3,在剖面序列中具有显著的波动性,同时检出了少量孕甾烷和 4-甲基甾烷。有机质母质构成中,既有丰富的藻类等低等水生生物,可能还有一定比例陆生高等植物输入混合的特点。油页岩处于成熟阶段,整个油页岩剖面序列具有一致的热演化程度。剖面中部油页岩具有极高的原始生产力,氧化-还原条件也是控制油页岩TOC和沥青“A”含量在剖面垂向变化的重要因素.
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| 关 键 词： | 生物标志化合物 有机质成熟度 沉积环境 海相油页岩 中侏罗统 藏北双湖 |
| 文章编号： | 1000-0550(2001)02-0287-06 |
| 收稿时间： | 2000-05-09 |
| 修稿时间： | 2000年5月9日 |
Characteristics of Biomarker Compounds and Its Implication of Middle Jurassic Oil Shale Sequence in Shuanghu Area, Northern Tibet Plateau |
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| LIN Jin hui,YI Hai sheng,LI Yong,WANG Cheng shan,PENG Ping an.Characteristics of Biomarker Compounds and Its Implication of Middle Jurassic Oil Shale Sequence in Shuanghu Area, Northern Tibet Plateau[J].Acta Sedimentologica Sinica,2001,19(2):287-292. |
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| Authors: | LIN Jin hui YI Hai sheng LI Yong WANG Cheng shan PENG Ping an |
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| Institution: | 1 Testing and Analyzing Centre, Chengdu University of Technology, Chengdu 610059;2 Institute of Sedimentology, Chengdu University of Technology,Chengdu 610059 |
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| Abstract: | Abundant hiomarkcrs, including n-alkancs, isoprcnoid, stcrancs and tcrpancs, have been detected by GC-MS from the middle Jurassic oil shalcs in the Shuanghu area northern Tibet plateau.N-alkancs contain carbon number nC12-nC35 with a rclativclv wide range,nC15,nC16 or nC17 as the highest peak.Examination of the relative abundance show a dominancc of low carbon molecular components in the n-alkanc.Pr/Ph ratio in oil shalcs range from 0.77 to 1.59, and it fluetuatcs in the vertical section.The upper and lower part of the oil shalcs have slight predominance of pristanc, whereas phytune dominates in the middle part of the oil shale sequence.C30-hopanc is the most abundant in the hopanc series.According to the rclativclv abundance, pcntacvclic tritcrpanc>tricvclic tcrpanc>quartcvclic tcrpanc.Stcranc ∑C27/C29 ratio ranges from 0.79 to 1.20} and ∑(C27+C28)>∑C29.The carbon number distribution of the stcrancs show a slight predominance of C27 components over C29 in the lower part of the oil shalcs and a slight dominance of C29 component over C27 in the upper part of the oil shalcs sequence.C27-diastcranc/ C27-stcranc ratio range from 0.51 to 3.63,which also fluctuate in the vertical section.It indicates organic matter of algacl origin with proper ratio contribution from terrestrial sources.The organic matter in the oil shalcs is mature.Different Pr/Ph and C27-diastcrancs/C27-stcrancs proved cspcciallv useful in asscssing variation in dcpositional environment and recognizing preservation potential of the organic matter. |
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| Keywords: | biomarkers organic matter maturity depositional environment oil shales of marine origin middle Jurassic Shuanghu area northern Tibet Plateau |
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