南羌塘坳陷中侏罗统布曲组油藏带流体包裹体特征与油气充注历史

发布时间：2018-03-21 05:35

本文选题：流体包裹体　切入点：油气充注期次和时期　出处：《石油学报》2016年10期 　论文类型：期刊论文

【摘要】：南羌塘坳陷中侏罗统布曲组含油白云岩中发育有大量与烃类活动有关的流体包裹体,其记录了油藏带油气运移、聚集和成藏过程。在流体包裹体岩相学研究的基础上,开展了包裹体显微荧光分析和均一温度测试,并划分了油藏带原油类型,讨论了油气充注过程。结果表明:1油藏带表现出多幕次油气聚集成藏特征,存在4类不同成熟度的原油包裹体和1类干气包裹体充注,尽管4类原油包裹体在隆鄂尼区块和昂达尔错区块的显微荧光颜色存在差异,但光谱波峰形态相似,而主峰波长和红绿熵参数则明显不同,推测其来自同一烃源岩的不同成熟度阶段。2油藏带主成藏期在晚侏罗世—早白垩世期间,是盆地经历最大埋深阶段油气充注时期;但在早白垩世时期,局部的构造活动导致原生油藏发生二次调整,油包裹体呈非均一相,平均均一温度和盐度均发生变化;新近纪中晚期(盆地第二次生烃高峰时期),差异性沉陷或局部的热异常致使部分油气转化成干气,并伴随流体运移、捕获、充注于白云石颗粒和方解石胶结物中。
[Abstract]:There are a large number of fluid inclusions related to hydrocarbon activities in the oil-bearing dolomites of the Buqu formation of the Middle Jurassic in the South Qiangtang Depression, which record the migration, accumulation and accumulation of oil and gas in the reservoir zone. The microfluorimetric analysis and homogenization temperature test of inclusions are carried out, and the types of crude oil in reservoir zones are classified, and the process of oil and gas charging is discussed. There are four types of oil inclusions with different maturity and one type of dry gas inclusions filled. Although the microscopic fluorescence colors of the four types of oil inclusions are different in Longni and Ondaro blocks, the spectral peaks are similar. The main peak wavelength and the parameters of red and green entropy are obviously different. It is inferred that the main reservoir forming period of the reservoir belt .2 from the same source rock in the period of late Jurassic to early Cretaceous is the period of oil and gas filling in the basin at the maximum buried depth stage. However, in the early Cretaceous period, the local tectonic activities resulted in secondary adjustment of the primary reservoir, the oil inclusions were heterogeneous, and the average homogenization temperature and salinity changed. In the middle and late Neogene (the second peak period of hydrocarbon generation in the basin), the differential subsidence or local thermal anomaly causes part of oil and gas to be converted into dry gas, accompanied by fluid migration, capture and filling in dolomite particles and calcite cement.
【作者单位】：成都理工大学沉积地质研究院;油气藏地质及开发工程国家重点实验室;中国地质科学院;四川省核工业地质局二八二大队;中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室;
【基金】：国家自然科学基金项目(No.41402099) 成都理工大学油气藏地质及开发工程国家重点实验室开放基金项目(No.PLC201603) 国土资源部沉积盆地与油气资源重点实验室开放基金项目(No.zdsys2014002)资助
【分类号】：P618.13

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