| 摘要: |
| 湖相细粒沉积岩的纹层发育,但纹层的厚度、密度、连续度等结构特征变化很大,这些变化与细粒沉积岩的沉积环境密切相关。利用图像分析的手段,对牛庄洼陷沙四上—沙三下亚段细粒沉积岩纹层的厚度、密度、侧向连续性进行定量表征,并与细粒沉积岩的各种物质成分对比研究。结果表明:牛庄洼陷沙四上—沙三下亚段细粒沉积岩的纹层厚度、密度、侧向连续性与长英质、黏土、碳酸盐等矿物质量分数基本没有相关性,纹层密度与有机碳含量具有一定的正相关性,长英质矿物与黏土矿物质量分数具有明显的正相关性；牛庄洼陷沙四上—沙三下亚段细粒沉积岩的沉积速率越低,越有利于有机碳含量的提高；长英质矿物与黏土矿物主要是洪水以表层流、层间流的形式一起搬运到深湖环境沉积下来的；湖泊表层碳酸盐矿物的产生与沉淀,与水体深度、沉积速率没有关系,也不存在湖相碳酸盐补偿界面(CCD)。 |
| 关键词: 沙河街组 细粒沉积岩 纹层结构 有机碳 矿物成分 |
| DOI：10.3969/j.issn.1673-5005.2024.02.001 |
| 分类号::TE 122.14 |
| 文献标识码:A |
| 基金项目:国家自然科学基金面上项目(41572123) |
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| Relationship between composition and lamination structure of fine-grained sedimentary rocks in upper fourth member to lower third member of Shahejie Formation in Niuzhuang Depression |
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WANG Guanmin1, BAI Yu1, JIANG Long2, ZHANG Yunjiao1, MENG Weixin1, REN Minhua2, XIONG Zhouhai1
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(1.School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China;2.Research Institute of Petroleum Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257015, China)
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| Abstract: |
| The development of laminations in lacustrine fine-grained sedimentary rocks exhibits significant variability in terms of thickness, density, and lateral continuity, which are closely related to the sedimentary environment of the fine-grained sedimentary rocks. This study focuses on the quantitative characterization of laminations thickness, density, and lateral continuity in the upper fourth member to lower third member of the Shahejie Formation in Niuzhuang Depression, emplying image analysis. The findings are compared with the diverse material compositions of the fine-grained sedimentary rocks. The results indicate that there is generally no discernible correlation between the thickness, density, and lateral continuity of laminations in the specified formations and the mass fraction of quartz, clay, carbonate, and other minerals within the fine-grained sedimentary rocks. However, a positive correlation is observed between lamination density and organic carbon content, along with a significant positive correlation between quartz minerals and clay minerals. This suggests that a lower the sedimentation rate in the fine-grained sedimentary rocks of the studied formations facilitates an increase in organic carbon content. The transportation of quartz minerals and clay minerals to deep lake environments primarily occurs through floods in the form of surface flow and interflow. The generation and precipitation of surface lake carbonate minerals appear to be independent of water depth or sedimentation rate. Furthermore, no compensation interface for lacustrine carbonate (CCD)is identified. |
| Key words: Shahejie Formation fine-grained sedimentary rock laminated structure organic carbon mineral composition |
