| 周静,戴朝成,张雨,吴雷.鄂尔多斯盆地延长组 73段页岩纹层有机地球化学特征[J].矿产勘查,2026,2(2):268-281 |
| 鄂尔多斯盆地延长组 73段页岩纹层有机地球化学特征 |
| Analysis of organic geochemical characteristics of shale in member 73 of the Yanchang Formation, Ordos Basin |
| 投稿时间：2025-10-13 |
| DOI：10.20008/j.kckc.202602005 |
| 中文关键词: 鄂尔多斯盆地 有机地球化学特征 页岩纹层 烃源岩评价 |
| 英文关键词: Ordos Basin organic geochemical characteristics shale laminae source rockevaluatio |
| 基金项目:本文受国家青年科学基金(41402085)资助。 |
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| 摘要点击次数: 125 |
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| 中文摘要: |
| 鄂尔多斯盆地是中国陆相致密油气勘探的重要区域，上三叠统延长组 7段页岩的有机地球化学研究对揭示烃源岩非均质性与资源潜力至关重要。为了研究鄂尔多斯长 73亚段页岩纹层分类及有机地球化学特征，本文以上三叠统延长组长 73段为例，采用岩石学、矿物学和地球化学分析，系统解析页岩有机质赋存规律。结果表明:长 73段可划分为粉砂级长英质、凝灰质、富有机质黏土、含有机质黏土纹层和均质黏土纹层 5类纹层，地球化学数据与纹层类型具有较好相关性，其中富有机质黏土纹层生烃潜力最高，整体处于低成熟阶段。在此基础上，建立 8种纹层分类模式，其中板状/波状富有机质泥质纹层及块状富有机质均质层构成页岩油气“甜点区”。为页岩油气“甜点”预测提供理论依据，同时为深化陆相湖盆烃源岩非均质性机制的认识提供参考。 |
| 英文摘要: |
| The Ordos Basin is an important area for the exploration of tight oil and gas in China. The organicgeochemical study of the Yanchang Formation Member 7 shale in the Upper Triassic is crucial for revealing the het-erogeneity of source rocks and their resource potential. To investigate the classification of laminae and organic geo-chemical characteristics of the Yanchang Formation Member 73 shale in the Ordos Basin, this paper takes the Yan-chang Formation Member 73 as an example and uses petrological, mineralogical and geochemical analyses to system-atically analyze the distribution of organic matter in the shale. The results show that the Member 73 can be divided into five types of laminae: fine-grained feldspathic and quartzose, tuffaceous, organic-rich clay, clay with organicmatter, and homogeneous clay laminae. The geochemical data have a good correlation with the types of laminae,among which the organic-rich clay laminae have the highest hydrocarbon generation potential and are generally inthe low-maturity stage. On this basis, eight types of laminae classification models are established. Among them, theplate-shaped/wavy organic-rich clay laminae and the massive organic-rich homogeneous laminae constitute the"sweet spots" of shale oil and gas, providing a theoretical basis for the prediction of shale oil and gas "sweet spots",and also offering a reference for deepening the understanding of the non-homogeneity mechanism of lacustrine ba-sin source rocks. |
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