| 藏北羌塘盆地胜利河油页岩干酪根特征及碳同位素指示意义 |
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| 引用本文：付修根,王剑,汪正江,何江林.2009.藏北羌塘盆地胜利河油页岩干酪根特征及碳同位素指示意义[J].地球学报,30(5):643-650. |
| DOI：10.3975/cagsb.2009.05.10 |
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| 基金项目:国家自然科学基金项目(编号: 40702020)、四川省青年科技基金（09ZQ026-006）和国家油气专项(编号: XQ2004-06)资助 |
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| 中文摘要:胜利河油页岩位于北羌塘盆地南部, 走向长超过34 km, 宽9 km。笔者对该油页岩各岩系干酪根进行了分离、镜鉴、元素分析和碳同位素分析, 结果表明, 该油页岩干酪根为Ⅱ型干酪根, 油页岩中干酪根含量较高, 介于15.79%~20.37%, 具有富氢少氧的特征, 其H/C和O/C比率分别为1.11~1.19和0.08~0.25, 为胜利河地区非常好的烃源岩。油页岩层干酪根13C相对富集, 具有相对较高的δ13CPDB值(-20.79‰~ -21.78‰), 与胜利河地区油页岩母源为较单一的藻类有关。藻类的大量繁殖造成了该类生物死亡埋藏速率远大于氧化速率, 在还原环境下大部分藻类还未被氧化就被埋藏, 从而保留了原始藻类略富13C的特征。胜利河油页岩的空间展布以及规模明显受古泻湖环境的控制。 |
| 中文关键词:羌塘盆地 胜利河油页岩 干酪根 碳同位素 |
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| Characteristics of Kerogens and Their Carbon Isotope Implications for the Shengli River Oil Shale in Qiangtang Basin, Northern Tibet |
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| Abstract:The Shengli River oil shale in the southern part of northern Qiangtang depression within northern Tibet plateau has a EW-extending length of more than 34 km and a width of 9 m in the north-south direction. Such oil shale is of great importance in the assessment of oil and gas resources in Qiangtang basin. The oil shale has high kerogen contents and H/C ratios (1.11~1.19) and low O/C values (0.08~0.25), implying a fairly ideal source rock. The oil shale and interbedded marl from the Shengli River area in Qiangtang basin have a remarkably heavy Ckerogen isotopic composition, ranging in δ13C values of the bulk organic matter from -20.79‰ to -21.78‰. The enrichment of 13C in the Shengli River oil shale can be attributed to a combination of the high growth rate and the sedimentary environment, with the paleo-lagoon environment obviously controlling the spatial distribution and size of oil shale. |
| keywords:Qiangtang basin Shengli River oil shale kerogen carbon isotope |
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