| 羌塘盆地东部上二叠统海陆交互相烃源岩特征及勘探前景 |
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| 引用本文：孙伟,任柳洁,占王忠,谢尚克,杨平,胡作维,曾胜强,侯乾,宋春彦.2025.羌塘盆地东部上二叠统海陆交互相烃源岩特征及勘探前景[J].地球学报,46(3):587-601. |
| DOI：10.3975/cagsb.2024.100901 |
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| 基金项目:国家自然科学基金项目(编号: 42172134)、中国地质调查局地质调查项目(编号: DD20221661; DD20230266)和中国石油化工股份有限公司勘探分公司项目(编号: 35450003-23-ZC0607-0018) |
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| 中文摘要:长期以来, 对羌塘盆地烃源岩研究多集中在中生代地层, 但近年来在羌塘盆地上二叠统发现了大量油气显示, 表明上二叠统具有良好的油气勘探潜力。为进一步查明羌塘盆地上二叠统的烃源岩条件, 本文选取了羌塘盆地东部上二叠统那益雄组6条野外剖面和1口钻井的暗色泥岩样品为研究对象, 通过有机地球化学方法对其进行分析。结果表明: 上二叠统那益雄组有机质丰度较高, 绝大多数达到烃源岩标准, 并含有数量可观的优质烃源岩(TOC>2%); 有机质类型以Ⅱ2、Ⅲ型为主, 含少量Ⅱ1型, 母质呈现混合来源的特征, 水生浮游生物和藻类贡献更大, 伴有一定量的高等植物输入, 多形成于还原-弱氧化环境, 部分形成于缺氧的超盐度环境; 有机质热演化程度均达到成熟阶段, 且以高成熟-过成熟为主, 多生凝析油、湿气。综合认为上二叠统那益雄组具有良好的生烃能力, 而且上覆地层拉卜查日组颗粒灰岩储层品质良好, 两者可以构成有利的含油气系统, 并具有良好的油气勘探潜力。 |
| 中文关键词:羌塘盆地 上二叠统 那益雄组烃源岩 勘探前景 |
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| Characteristics and Exploration Prospects of the Upper Permian Marine Land Interacting Source Rocks in the Eastern Qiangtang Basin |
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| Abstract:The focus on hydrocarbon source rocks in the Qiangtang Basin has for a long time been mostly on the Mesozoic strata. However, in recent years, many oil and gas discoveries have been made in the Upper Per-mian sequences of the Qiangtang Basin, indicating good oil and gas potential. To identify the source rock conditions of the Upper Permian in greater detail, dark mudstone samples from six profiles and one drilling well in the Upper Permian Nayixiong Formation were analyzed using organic geochemical methods. The results of the samples studied show that the abundance of organic matter in the formation is relatively high, with much of it reaching the standard of source rocks and containing a considerable amount of high-quality source rock (TOC>2%). The types of organic matter are mainly types II2 and III, with a small amount of type II1. Its parent material exhibits mixed source characteristics, with greater contributions of aquatic plankton and algae and a certain input from terrestrial plants. These source rocks accumulated mostly in a reducing environment, and some of them formed in an anoxic environment with hypersaline waters. The degree of thermal evolution of the organic matter has reached the mature stage, and it mainly falls into the high-maturity to over-mature conditions, which are prone to the generation of condensate oil and moisture. The results indicate that the Upper Permian Nayixiong Formation has good hydrocarbon genera-tion ability and that the quality of the superjacent bioclastic limestone reservoir is good. Both the source rocks and the reservoir form a favorable oil and gas system and have good oil and gas exploration potential. |
| keywords:Qiangtang Basin Upper Permian Nayixiong Formation source rock exploration prospects |
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