| 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 |
| 关键词:North Qiangtang Depression Changsheshan area Xiali Formation Controlling factors of organic matter enrichment |
| 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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| 摘要: |
| 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 |
| 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. |
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