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早始新世江汉盆地新沟嘴组下段沉积环境与有机质富集机理
范晓杰, 滕晓华, 王春连, 张靖宇, 陆扬博, 张亮, 陆永潮, 李龙, 秦占杰
PDF(11524 KB)
PDF(11524 KB)
早始新世江汉盆地新沟嘴组下段沉积环境与有机质富集机理
Sedimentary Environment and Organic Matter Enrichment Mechanism of the Lower Member of the Xingouzui Formation in the Jianghan Basin during the Early Eocene
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中国陆相页岩油资源潜力巨大，早始新世新沟嘴组下段（新下段）作为江汉盆地页岩油勘探的主要层位，先前的研究主要集中在生烃潜力及储层特征方面，有关其沉积环境演化及有机质富集机理方面的讨论仍相对缺乏.以江汉盆地SKD1和CY1钻孔早始新世新下段地层为主要研究对象，基于岩相分析及元素和同位素地球化学方法对新下段古环境变化及有机质富集机理进行了研究.结果表明：新下段有机质含量整体较低，总有机碳（TOC）均值为0.9%.在古新世‒始新世极热时期（PETM），快速增温和氧化环境加速了有机质的分解，导致有机质含量较低，TOC仅为0.5%；在气候干旱时期，湖水盐度上升，硬石膏、钙芒硝等蒸发盐矿物陆续沉积，高盐度条件下嗜盐生物贡献了部分生产力，并且高盐、缺氧的环境促进了有机质的保存，TOC含量增大为2.56%.指示了早始新世江汉盆地古湖泊的有机质富集主要受生产力和保存条件协同控制.本研究为温室气候条件下陆相咸化湖盆中的有机质富集机制做出了解释，同时为未来油气资源有利层段勘探提供了理论依据.
The potential of continental shale oil resources in China is enormous, and the lower member of the Xingouzui Formation (LXF) from the Early Eocene serves as the primary target for shale oil exploration in the Jianghan basin. Previous research has mainly focused on hydrocarbon generation potential and reservoir characteristics, while discussions regarding its depositional environment evolution and mechanisms of organic matter enrichment remain relatively scarce.This study takes the Early Eocene LXF from the SKD1 and CY1 boreholes as the main research object. Based on lithofacies, elemental, and isotopic geochemical analyses,it investigates the paleoenvironmental changes and organic matter enrichment mechanisms of the LXF. The results indicate that organic matter content in the LXF is relatively low, with an average total organic carbon (TOC) of 0.9%. During the Paleocene-Eocene Thermal Maximum (PETM), rapid warming and oxidative conditions accelerated the decomposition of organic matter, resulting in relatively low organic matter content, with a TOC of only 0.5%. In contrast, during arid climatic periods, increasing lake salinity led to the sequential deposition of evaporative minerals such as anhydrite and glauberite. Under high-salinity conditions, halophilic organisms contribute to part of the productivity. High salt and hypoxic environment promotes the production and preservation of organic matter, with average TOC increaing to 2.56%. These findings indicate that organic matter enrichment in the Jianghan basin during the Eocene was primarily controlled by synergy of productivity and preservation conditions. This study provides insights into the mechanisms of organic matter preservation in continental saline lacustrine basins under greenhouse climate conditions and provides a theoretical basis for identifying favorable stratigraphic intervals for future oil and gas exploration.
江汉盆地 / 早始新世 / 有机质富集 / 古环境 / 元素组成 / 沉积学 / 油气地质.
Jianghan basin / Early Eocene / organic matter enrichment / paleoenvironment / elemental composition / sedimentology / petroleum geology
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感谢杜一凡在碳氧同位素测试和数据校正中提供的帮助！
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