| 羌塘盆地毕洛错地区古油藏地球化学特征与油源对比 |
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| 引用本文： | 杨易卓,黄志龙,赵珍,唐友军.羌塘盆地毕洛错地区古油藏地球化学特征与油源对比[J].地球科学,2022,47(5):1834-1848. |
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| 作者姓名： | 杨易卓 黄志龙 赵珍 唐友军 |
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| 作者单位： | 1.中国石油大学地球科学学院，北京 102249 |
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| 基金项目： | 基于多源信息的羌塘盆地断裂保存条件;羌塘北部龙尾错地区油气地质调查项目;油气勘探选区研究项目 |
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| 摘 要： | 羌塘盆地是一个大型中生代海相沉积盆地，盆地内发育多套烃源岩，并发现多处古油藏和油气显示，确定古油藏油源对油气勘探至关重要.为明确古油藏油源，对古油藏和烃源岩样品进行地球化学分析.研究表明古油藏可分为2类:Ⅰ类古油藏整体处于成熟-高成熟阶段，C24四环萜烷丰度较高，三环萜烷丰度低，C29规则甾烷占有一定优势，C29藿烷含量较高，体现出以陆源有机质贡献为主的特征.Ⅱ类古油藏整体处于低成熟-成熟阶段，以C23三环萜烷为主峰，低丰度C24四环萜烷，C27规则甾烷占优势，表明母质来源以低等水生生物为主.油源对比表明，两类古油藏来源于不同的烃源岩，Ⅰ类油藏来自于上三叠统扎那组烃源岩，Ⅱ类油藏主要为下侏罗统曲色组烃源岩的贡献.
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| 关 键 词： | 羌塘盆地 古油藏 烃源岩 生物标志化合物 油源对比 油气地质 |
| 收稿时间： | 2021-12-06 |
Geochemical Characteristics and Oil Source Correlation of Paleo-Reservoirs in Biluocuo Area,Qiangtang Basin |
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| Yang Yizhuo,Huang Zhilong,Zhao Zhen,Tang Youjun.Geochemical Characteristics and Oil Source Correlation of Paleo-Reservoirs in Biluocuo Area,Qiangtang Basin[J].Earth Science-Journal of China University of Geosciences,2022,47(5):1834-1848. |
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| Authors: | Yang Yizhuo Huang Zhilong Zhao Zhen Tang Youjun |
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| Abstract: | Qiangtang basin is a large Mesozoic marine sedimentary basin, in which several sets of source rocks are developed, and many paleo-reservoirs and hydrocarbon indications are discovered. Determining the oil source of paleo-reservoirs is very important for oil and gas exploration. In order to clarify the oil source of the paleo-reservoir, geochemical analysis of oil and source rock samples is carried out in this paper. The results show that the paleo-reservoirs can be divided into two types: type Ⅰ paleo-reservoirs are in the mature-high mature stage in general with the high content of C24 tetracyclic terpane, the low tricyclic terpane abundance, C29 regular sterane with certain advantages in content, and high C29 hopane content, reflecting the contribution of terrigenous organic matter. Type Ⅱ paleo-reservoir is in the low mature-mature stage in general, with C23 tricyclic terpane as the main peak, low content of C24 tetracyclic terpane and the domination of C27 regular sterane, indicating the precursor was mainly lower aquatic organisms. The oil-source correlation result shows that the two types of paleo-reservoirs come from different source rocks. Type Ⅰ crude oil comes from the source rocks of Zhana Formation of Upper Triassic, and type Ⅱ crude oil is mainly contributed by the source rocks of Quse Formation of Lower Jurassic. |
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