| 塔里木盆地玉北地区奥陶系成岩流体演化与油气成藏时期的耦合关系 |
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| 引用本文： | 尚培,陈红汉,鲁子野,丰勇,云露.塔里木盆地玉北地区奥陶系成岩流体演化与油气成藏时期的耦合关系[J].地球科学,2020,45(2):569-582. |
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| 作者姓名： | 尚培 陈红汉 鲁子野 丰勇 云露 |
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| 作者单位： | 1.中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074 |
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| 基金项目： | 国家重点基础研究发展计划课题2012CB214804国家"十二五"重大科技专项2008ZX05008-003-30 |
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| 摘 要： | 尽管流体包裹体均一温度-埋藏史投影法已被广泛地应用于油气成藏时期确定，但对于多旋回叠合盆地仍存在不确定性，即同一个均一温度可对应两个或者两个以上埋藏深度.为减少这种多解性，对研究区63件样品进行了岩石学观察、碳氧同位素测试和流体包裹体系统分析测试，运用成岩序列约束及流体包裹体均一温度和捕获压力双参数来约束确定油气成藏年龄.在确定油包裹体及其同期盐水包裹体的均一温度、油包裹体的气泡填充度和包裹体油组分基础之上，利用PVTsim热动力学模拟软件恢复油包裹体最小捕获压力.将油包裹体捕获压力和其同期盐水包裹体均一温度投影到埋藏史图上来求取油气充注年龄，再把充注年龄标注在同一时间轴上进行油气成藏期次划分和成藏时期确定.结果表明，塔里木盆地玉北地区奥陶系存在3期油充注:第一期发生在加里东晚期447.1~444.0 Ma；第二期发生在海西晚期295.0~274.7 Ma；第三期发生在喜山期14.7~8.8 Ma.第一期和第二期充注的油气在构造"跷跷板"运动过程中发生了破坏或调整，第三期充注油气才可能是勘探的现实目标.
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| 关 键 词： | 流体包裹体 均一温度 捕获压力 成岩序列 成藏年龄 塔里木盆地 油气地质 |
| 收稿时间： | 2018-11-22 |
The Coupling Relationship between Diagenetic Fluid Evolution and Hydrocarbon Accumulation in the Ordovician of Yubei Area,Tarim Basin |
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| Abstract: | Although the method of homogenization temperature (Th) of fluid inclusion projecting on burial history diagram with thermal curve to obtain hydrocarbon charging times has been widely and effectively used,some uncertainty arises on the multi-cycle superimposed basins,in which one Th can appear at two or more than two depths. For the purpose of reducing the multiple solutions,63 samples of the Ordovician in Yubei area have been employed to make diagenetic observation,carbon and oxygen isotope analyses,and fluid inclusions analyses. Diagenetic sequence and two parameters of Th and trapping pressure (Pt) have been utilized to doubly constrain the times of hydrocarbon charging. When the Th of oil inclusion and its coeval aqueous inclusion,gas to liquid ratio of oil inclusion and chemical components of oil inclusion are obtained,the trapping pressure of the oil inclusion can be thermodynamically modeled by the software PVTsim. After the Pt of oil inclusion and the Th of its coeval aqueous inclusion were projected doubly on burial history diagram for each well,the hydrocarbon charging time would be determined. Then,we put all the charging times on the same geological age axis,three events of hydrocarbon charging occurred in the Ordovician of Yubei area,Tarim basin:the first event took place from 447.1 Ma to 444.0 Ma (during the Late Caledonian); the secondary event from 295.0 Ma to 274.7 Ma (during the Late Hercynian); the tertiary event from 14.7 Ma to 8.8 Ma (during the Late Himalaya). The oil pools charged by the first and the secondary event were destroyed or adjusted in the process of tectonic movement,and the oil pools charged by the tertiary event maybe the favorable exploration target. |
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