| 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 |
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| 引用本文：陈程,吴珍汉,王利,季长军,赵珍.2025.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[J].地球学报,46(3):533-543. |
| DOI：10.3975/cagsb.2024.092402 |
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| 基金项目:国家自然科学基金项目(编号: 42102201)和中国地质调查局地质调查项目(编号: DD20242200) |
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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 Xiali Formation in Changsheshan Area, Northern 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 definitively confirmed. We herein describe the elemental geochemistry of fine-grained sedimentary rocks of the Xiali Formation in Changsheshan area of Northern Qiangtang depression. Our re-search indicates that the source rocks of the Xiali Formation in Northern Qiangtang Depression have expe-rienced hot, arid conditions and strong chemical weathering during the sedimentary periods. The sedimen-tary water was shallow, salty, and oxygen-poor to anoxic, with a moderate sedimentation rate and terri-genous input. The Changsheshan area of the Northern 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 in-puts and the phosphorus and iron nutrients content carried by the submarine hydrothermal fluid entering the ocean is the main factor contributing to organic matter enrichment. High paleoproductivity in the Chang-sheshan area of Northern Qiangtang Depression is the main factor influencing organic matter enrichment. The anoxic sedimentary environment and moderate terrigenous input are also the important condi-tions for organic matter enrichment. These findings and insights provide a reference for understanding the formation mechanism and predicting the distribution of high-quality source rocks from the Mid-Jurassic sedimentary sequence in Northern Qiangtang depression. |
| keywords:Northern Qiangtang depression Changsheshan area Xiali Formation factors controlling organic matter enrichment |
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