| 滇黔北坳陷五峰组-龙马溪组下段页岩岩相与沉积环境 |
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| 引用本文： | 陈科洛,张廷山,梁兴,张朝,王高成.滇黔北坳陷五峰组-龙马溪组下段页岩岩相与沉积环境[J].沉积学报,2018,36(4):743-755. |
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| 作者姓名： | 陈科洛 张廷山 梁兴 张朝 王高成 |
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| 作者单位： | 1.油气藏地质及开发工程国家重点实验室·西南石油大学, 成都 610500; |
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| 基金项目： | 国家自然科学基金项目(41772150) |
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| 摘 要： | 滇黔北坳陷为南方海相地层的有利研究区域，发育多套海相页岩。上奥陶统五峰组与下志留统龙马溪组地层，尤其是五峰组-龙马溪组下段页岩作为优质烃源岩而备受重视。通过岩芯观察、薄片鉴定、X衍射分析及微量元素地球化学指标判识，对其进行页岩岩相划分与沉积环境分析。结果显示:滇黔北坳陷五峰组-龙马溪组下段地层共划分出六种页岩岩相:硅质页岩、黏土质页岩、钙质页岩、黏土质硅质混合页岩、黏土质钙质混合页岩、钙质硅质混合页岩，其中硅质页岩和黏土质页岩的TOC含量明显高于其余四种岩相。V/（V+Ni）、V/Cr、Ni/Co和U/Th指标指示五峰组-龙马溪组下段总体处于低能、滞留、局限条件，与深水陆棚环境匹配，Mo元素含量与四川盆地均值相当。五峰早期与龙马溪早期海侵的发生形成了以深水陆棚占主导的沉积格局，低能、滞留、局限的厌氧环境与快速海侵是有机质富集与保存的重要条件。
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| 关 键 词： | 滇黔北坳陷 五峰组-龙马溪组下段 页岩岩相 沉积环境 厌氧条件 |
| 收稿时间： | 2017-08-07 |
Analysis of Shale Lithofacies and Sedimentary Environment on Wufeng For-mation-Lower Longmaxi Formation in Dianqianbei Depression |
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| CHEN KeLuo,ZHANG TingShan,LIANG Xing,ZHANG Zhao,WANG GaoCheng.Analysis of Shale Lithofacies and Sedimentary Environment on Wufeng For-mation-Lower Longmaxi Formation in Dianqianbei Depression[J].Acta Sedimentologica Sinica,2018,36(4):743-755. |
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| Authors: | CHEN KeLuo ZHANG TingShan LIANG Xing ZHANG Zhao WANG GaoCheng |
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| Institution: | 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;2.School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;3.PetroChina Zhejiang Oilfield Company, Hangzhou 310023, China |
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| Abstract: | Multiple sets of marine shales sediment in the Dianqianbei depression lead to a meaningful study area for marine stratum in southern China. The Upper Ordovician Wufeng Formation and Lower Silurian Longmaxi Formation, especially the Wufeng-Lower Longmaxi Formation considered as high-quality source rock has been raised much attention. We classified the shale lithofacies and analyzed the environment by cores observation, thin section identification, XRD and geochemical indicators of trace elements. Six types of shale lithofacies are classified, including siliceous shale, clayey shale, calcareous shale, clayey and siliceous shale, clayey and calcareous shale, calcareous and siliceous shale. Among the six types of shale lithofacies, TOC are richer in the siliceous shale and clayey shale than other four types. V/(V+Ni), V/Cr, Ni/Co and U/Th show Wufeng-Lower Longmaxi Formation sediments in the conditions of low energy, sluggish water flow and constrained sea water, which matches deep shelf. Mo content in Dianqianbei depression is near to the content in Sichuan Basin. Transgressions happen in early stage of Wufeng and Longmaxi, which lead deep shelf plays a vital role in the sedimentary environments. Anaerobic environment of low energy, sluggish water flow, constrained water condition and rapid transgression are essential in the richness and preservation of organic matter. |
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