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为进一步落实焉耆盆地博湖坳陷的油气成藏期次,采用储层成岩矿物及其流体包裹体测试分析法,并结合自生伊利石同位素年龄分析等各种研究成果来综合确定盆地油气成藏期次。盆地侏罗系储层中流体包裹体主要分布于三工河组和八道湾组,其均一温度多为101~110℃和121~130℃,组分中的正构烷烃碳数呈双峰态,前主峰为18或20,后主峰为26或27,这些特征指示盆地在侏罗纪中晚期发生两次成藏作用:第一期形成于源岩处于低成熟阶段的中晚侏罗世;第二期形成于源岩处于成熟阶段的侏罗纪末。
In order to further realize the stages of oil and gas accumulation in the Bohu depression of the Yanqi Basin, reservoir-forming diagenetic minerals and their fluid inclusions were used for test and analysis, combined with various studies such as authigenic illite isotope ages to comprehensively determine hydrocarbon accumulation in the basin Period. The fluid inclusions in the Jurassic reservoirs of the basin are mainly distributed in the Sangonghe Formation and the Badaowan Formation. The homogenization temperatures are mostly between 101 and 110 ℃ and 121 to 130 ℃, and the n-alkanes in the components show a bimodal , The former main peak is 18 or 20 and the second main peak is 26 or 27, indicating that the basin had two reservoir forming processes in the middle and late Jurassic: the first stage was formed in the middle-late Jurassic with the source rock in the low maturity stage; the second The period was formed at the end of the Jurassic period when the source rock was at a mature stage.