查干凹陷白垩系储层油气包裹体特征、流体分析及其应用

发布时间：2018-04-05 08:12

  本文选题：查干凹陷　切入点：油气包裹体　出处：《成都理工大学》2015年硕士论文

【摘要】：查干凹陷位于内蒙古自治区乌拉特后旗,银-额盆地东部,查干德勒苏坳陷中央,西临西尼凸起,北达中央隆起带,东临楚干凸起,东南紧靠狼山。北东长60km,南西宽34km,面积约2000km2,基底最大埋深6400m。本文主要通过裹体烃的文献资料的查阅对流体包裹体的分类及其基本特征进行系统的总结,并在此基础上分析查干凹陷的包裹体的特征,有机包裹体主要产出于石英次生加大边、颗粒裂纹内、次生裂隙以及少部分分布在石英颗粒和方解石表面。包裹体的形态大多规则,以椭圆形、长条形为主及少部分不规则状的形状。包裹体大小一般为3~9μm。流体包裹体的气液比一般分布比较广,大部分介于3%~15%之间,产状主要为单个独立和成群分布。主要是以液相烃类包裹体居多,纯气相烃类包裹体较少。烃类包裹体的紫外荧光颜色主要为黄绿色与蓝白色,即说明查干凹陷的成熟度为中成熟和高成熟为主。与烃类包裹体共生的含烃盐水包裹体温度范围分布比较广,在75.9~172℃之间。通过包裹体的均一温度分析了查干凹陷的油气成藏期次,巴一段经历了苏红图组沉积时期一期油气成藏;巴二段经历了苏红图组沉积时期和银根组沉积时期两期油气成藏;苏一段和苏二段经历了银根组沉积时期一期成藏。通过各项生物标志化合物的参数对比分析储层烃与包裹体烃的关系确定其母质输入来源为低等水生生物和陆源高等植物的双重贡献且陆源高等植物的输入占优势,沉积环境主要为还原环境,其演化程度至少处于低熟或中成熟阶段。通过油源对得出虎勒洼陷和额很洼陷有效烃源岩特征相似,所以说其原油可能主要来自近洼缓坡带有效烃源岩。原油从虎勒洼陷生排烃后,沿着断层向上运移进入圈闭到达中央构造带形成油藏,额很洼陷东部缓坡带有效烃源岩生排烃后,其原油沿砂体侧向运移,进入乌力吉构造带形成油藏。
[Abstract]:Chagan sag is located in Wulat Houqi, Inner Mongolia Autonomous region, east of Yinyeh basin, central of Chagandelesu depression, west of Xini uplift, north of central uplift zone, east of Chugan uplift, and southeast of Langshan.The area is about 2000km2 and the maximum buried depth of the basement is 6400m.In this paper, the classification and basic characteristics of fluid inclusions are systematically summarized by consulting the literature of hydrocarbon envelopes, and on this basis the characteristics of inclusions in Chagan depression are analyzed.Organic inclusions mainly occur on the surface of quartz particles and calcite due to the secondary enlargement edge of quartz particles and the secondary cracks in the grain cracks.The shape of inclusions is mostly regular, oval, long and a few irregular.The size of inclusions is generally 3 ~ 9 渭 m.The gas-liquid ratio of fluid inclusions is relatively wide, most of which are between 3% and 15%, and the occurrence of fluid inclusions is mainly a single independent and group distribution.Most of the hydrocarbon inclusions are liquid hydrocarbon inclusions, but the pure gas hydrocarbon inclusions are less.The ultraviolet fluorescence color of hydrocarbon inclusions is mainly yellowish green and blue-white, which means that the maturity of Chagan sag is mainly medium mature and high mature.The temperature range of hydrocarbon-bearing brine inclusions, which are symbiotic with hydrocarbon inclusions, is wide, ranging from 75.9 鈩，

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