| 羌塘盆地土门地区上三叠统土门格拉组烃源岩地球化学特征 |
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| 引用本文： | 解,龙.羌塘盆地土门地区上三叠统土门格拉组烃源岩地球化学特征[J].地质与勘探,2016,52(4):774-782. |
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| 作者姓名： | 解 龙 |
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| 作者单位： | 成都理工大学沉积地质研究院,四川成都,610059 |
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| 基金项目： | 羌塘盆地土门地区天然气水合物1:5万区块地质调查项目（编号: GZHL20110302-1）资助 |
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| 摘 要： | 本文在南羌塘盆地土门地区获得一套上三叠统土门格拉组泥质烃源岩。通过有机质丰度、有机质类型和有机质热演化程度的分析,结果表明,土门格拉组泥质烃源岩有机碳含量在0.54%~1.36%之间,达到了中等-好烃源岩标准,局部达到很好烃源岩标准;干酪根镜检结果显示,有机质类型主要为II1型。镜质体反射率Ro为1.61%~2.76%,岩石热解峰温Tmax介于340~544℃之间,干酪根腐泥组颜色为棕色-棕褐色,表明有机质演化达到过成熟阶段。土门地区土门格拉组泥质烃源岩的发现进一步表明羌塘盆地上三叠统烃源岩具备良好的生烃(气)潜力。
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| 关 键 词： | 羌塘盆地 土门地区 土门格拉组 烃源岩 |
| 收稿时间： | 2016/3/30 0:00:00 |
| 修稿时间： | 2016/6/20 0:00:00 |
Geochemical characteristics of the Upper Triassic Tumengela Formation source rocks in the Tumen area of the Qiangtang basin, Tibet |
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| Xie Long.Geochemical characteristics of the Upper Triassic Tumengela Formation source rocks in the Tumen area of the Qiangtang basin, Tibet[J].Geology and Prospecting,2016,52(4):774-782. |
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| Authors: | Xie Long |
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| Institution: | Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan |
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| Abstract: | This work obtained a set of mudstone source rocks from the Upper Triassic Tumengela Formation in the Tumen Area, southern Qiangtang basin of Tibet. An analysis has been made to its organic matter abundance, organic matter type and organic matter maturity. The results indicate that the total organic carbon (TOC) content ranges between 0.54% and 1.36%, mostly reaching a medium-good standard and few reaching a very good level. The microscopic examination of kerogens shows the organic matter being mainly of II1 type. The vitrinite reflectance is as high as Ro=1.61%~2.76%. The pyrolysis peak temperature of rocks is between 340°C and 544°C. In addition, the sapropelinite in the kerogens is brown-sepia, implying the thermal evolution of organic matter has come up to a high maturity stage. The discovery of this suit of source rocks further suggests that the Upper Triassic source rocks of the Qiangtang basin have a good potential of hydrocarbon generation. |
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| Keywords: | Qiangtang basin Tumen area Tumengela Formation source rocks |
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