| 北羌塘坳陷长蛇山地区夏里组细粒沉积岩形成环境及其对有机质富集的控制作用 |
| 投稿时间：2024-06-04 修订日期：2024-07-11 点此下载全文 |
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| 基金项目:国家自然科学基金项目青年基金（编号42102201）羌塘盆地侏罗纪海相优质烃源岩有机质富集机制 |
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| 中文摘要:羌塘盆地是我国中生代海相含油气沉积盆地，主力烃源岩尚未落实。本文通过对北羌塘坳陷长蛇山地区夏里组细粒沉积岩开展元素地球化学研究，结果表明，北羌塘坳陷长蛇山夏里组烃源岩沉积时期气候干旱炎热，具有较强的化学风化作用；沉积水体较浅、盐度较高，贫氧-缺氧的沉积环境，具有适中的沉积速率和陆源输入。北羌塘坳陷长蛇山地区邻近中央隆起西部物源剥蚀区，含有较多的陆源输入，同时海底火山活动频发，陆源输入和海底热液携带的大量营养物质磷、铁等进入海洋，引起海洋上部较高的初级生产力是有机质富集的主控因素。北羌塘坳陷长蛇山地区较高的古生产力是有机质富集的主控因素，缺氧的沉积环境和适中的陆源输入是有机质富集的重要条件。这些研究成果和认识为探讨北羌塘坳陷中侏罗统优质烃源岩形成机制和预测优质烃源岩的分布提供了参考依据。 |
| 中文关键词:北羌塘坳陷 长蛇山地区 夏里组； 有机质富集控制因素 |
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| The Formation Environment of Fine-grained Sedimentary Rocks and Its Controlling Effect on Organic Matter Enrichment in the XialiFormation in Changsheshan Area, North Qiangtang Depression |
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| Abstract:The Qiangtang Basin is a Mesozoic Marine hydrocarbon sedimentary basin in China, where the main source rocks have not been found.The element geochemistry of fine-grained sedimentary rocks of Xiali Formation in Changsheshan area of North Qiangtang depression is studied in this paper .The results show that the source rocks of Xiali Formation in North Qiangtang Depression were arid and hot and had strong chemical weathering during the sedimentary period. The sedimentary water is shallow, salty, oxygen-poor and anoxic, with moderate sedimentation rate and terrigenous input.The Changsheshan area of the North Qiangtang Depression is adjacent to the provenance denudation area in the west of the central uplift, which contains more terrigenous inputs and frequent submarine volcanic activities. The high primary productivity of the upper ocean caused by terrigenous inputs and the nutrients phosphorus and iron carried by the submarine hydrothermal fluid enter the ocean is the main factor of organic matter enrichment.High paleoproductivity in Changsheshan area of North Qiangtang Depression is the main factor of organic matter enrichment, and anoxic sedimentary environment and moderate terrigenous input are the important conditions for organic matter enrichment. These research results and understanding provide a reference for exploring the formation mechanism and predicting the distribution of high-quality source rocks in the Middle Jurassic in North Qiangtang depression. |
| keywords:North Qiangtang Depression Changsheshan area Xiali Formation Controlling factors of organic matter enrichment |
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