| 热液活动对东二沟剖面玉尔吐斯组烃源岩形成的影响 |
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| 引用本文： | 储呈林,陈强路,张博,史政,姜海健,杨鑫.热液活动对东二沟剖面玉尔吐斯组烃源岩形成的影响[J].沉积学报,2016,34(4):803-810. |
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| 作者姓名： | 储呈林 陈强路 张博 史政 姜海健 杨鑫 |
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| 作者单位： | 1.中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所 江苏无锡 214126; |
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| 基金项目： | 国家重点基础研究发展计划(973)项目(2012CB214801)，中国石化科技部项目(P12004)，National Key Basic Research Project (973 Project).No.2012CB214801，Project of Science and Technology Department of SINOPEC |
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| 摘 要： | 研究热液活动是否会破坏烃源岩的形成。对塔里木盆地东二沟剖面玉尔吐斯组进行地球化学分析，利用δEu、Fe/Ti和（Fe+Mn）/Ti比值研究热液活动，Al/Ti比值替代古生产力，V/Cr、V/（V+Ni）和Ni/Co比值代表氧化还原环境，进而探讨热液活动与古生产力、氧化还原条件以及有机质含量之间的关系。玉尔吐斯组沉积时古生产力水平较低，为贫氧-厌氧环境，下部具有较强的热液活动，中上部热液活动较弱。下部的热液活动虽然促进了古生产力的提高，但TOC含量整体较低，为0.01%～3.58%，平均值为0.64%；中上部热液活动较弱，古生产力水平较低，TOC含量却较高，为0.06%～12.19%，平均值为8.95%，是较好的烃源岩层。岩石薄片显示，与热液活动相关的硅质岩中含有大量的藻类。研究结果表明，较强的热液活动会带来大量的富硅流体，稀释沉积物中的有机质，对烃源岩的形成起破坏作用。
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| 关 键 词： | 热液活动 烃源岩 玉尔吐斯组 塔里木盆地 |
| 收稿时间： | 2015-07-07 |
Influence on Formation of Yuertusi Source Rock by Hydrothermal Activities at Dongergou Section,Tarim Basin |
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| CHU ChengLin,CHEN QiangLu,ZHANG Bo,SHI Zheng,JIANG HaiJian,YANG Xin.Influence on Formation of Yuertusi Source Rock by Hydrothermal Activities at Dongergou Section,Tarim Basin[J].Acta Sedimentologica Sinica,2016,34(4):803-810. |
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| Authors: | CHU ChengLin CHEN QiangLu ZHANG Bo SHI Zheng JIANG HaiJian YANG Xin |
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| Institution: | 1.Wuxi Research Institute of Petroleum Geology, Research Institute of Petroleum Exploration and Development, SINOPEC, Wuxi, Jiangsu 214126, China;2.Tyumen State Oil and Gas University, Tyumen 625003, Russia |
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| Abstract: | Based on geochemical analyses of Yuertusi Formation at Dongergou section of Tarim basin, trace elements and rare earth elements are used to probe paleoenvironmental conditions.Using δEu, Fe/Ti and (Fe+Mn)/Ti ratios for the interpretation of hydrothermal activity, Al/Ti ratios as paleoproductivity proxies and V/Cr, V/(V+Ni) and Ni/Co ratios as paleoredox proxies, the relationship of hydrothermal activity, paleoproductivity, paleoredox and total organic carbon was discussed. The data shows that Yuertusi Formation was deposited under dominantly euxinic conditions with a low paleoproductivity and that the lower part of the section experienced a strong hydrothermal activities. Although the hydrothermal activities improve the paleoproductivity of the lower part, the total organic carbon is low and ranges from 0.01% to 3.58% with an average of 0.64%. The middle-upper part of the section have a weak hydrothermal activities, but the total organic is high and ranges from 0.06% to 12.19% with an average of 8.95%. There are plenty of algal in the thin section of cherts related with hydrothermal activities. The study suggests that strong hydrothermal activities provided a lot of silica-rich fluid, which diluted the organic matter in the sediments and destroyed the formation of high-quality source rocks. |
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| Keywords: | hydrothermal activity source rock Yuertusi Formation Tarim Basin |
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