Organic inclusion and hydrocarbon charging events of the Bagung Formation in the Quemoco area, Qiangtang Basin
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摘要:
上三叠统巴贡组是羌塘盆地最重要的含油气层系之一，针对盆地东部雀莫错地区的巴贡组储层开展了流体包裹体岩相学、显微测温及显微荧光分析。结果表明，砂岩中的盐水包裹体共记录了4期热流体活动，在第2~3期热流体活动中，检测到了2类含油相包裹体：数量较少的发黄色荧光油包裹体主要分布于石英颗粒内裂纹中，数量较多的发蓝色荧光油包裹体主要分布于石英次生加大边中。根据2类油包裹体的产状分布和荧光光谱特征，综合地层埋藏史和生烃史分析，认为二者共同代表了一次晚侏罗世的油气充注，与盆地中部地区一致。
Abstract:The Upper Triassic Bagung Formation is one of the most important hydrocarbon-bearing strata in the Qiangtang Basin.Based on the analysis of fluid inclusion facies, microscopic temperature measurement and microscopic fluorescence analysis, the brine inclusions in the sandstone of the Bagung Formation in Quemoco area recorded 4 stages of thermal fluid activity, of which the second to the third stage fluid contain two types of oil phase inclusions.In stage 2 to stage 3 of thermal fluid activity, a small number of yellowish fluorescent oil inclusions are mainly distributed in the cracks within the quartz particles, and a large number of blue fluorescent oil inclusions are mainly distributed in the quartz secondary enlarged side.Based on the occurrence and fluorescence spectrum characteristics of the two types of oil inclusions, combined with comprehensive analysis of stratigraphic burial history and hydrocarbon generation history, it is considered that they represent a period of Late Jurassic oil and gas filling, which is consistent with the central basin.
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Keywords:
- Qiangtang Basin /
- Quemoco area /
- Bagung Formation /
- organic inclusion /
- hydrocarbon charging events
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致谢: 衷心感谢中国地质调查局成都地质调查中心羌塘油气项目组全体成员在野外工作中提供的帮助，感谢审稿专家提出的有益建议。
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图 1 羌塘盆地构造分区(a)及取样位置(b)
Figure 1. Tectonic subdivisions(a) of the Qiangtang Basin and the location of samples(b)
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图版1
a.样品编号BG-1，石英颗粒裂缝中的盐水包裹体呈分散状分布，×400 tr；图中数字为包裹体均一温度(℃)；b.样品编号BG-1，石英颗粒裂缝中的盐水包裹体呈带状沿裂缝分布，×400 tr；c.样品编号BG-4，石英颗粒中见穿石英颗粒裂纹的单一液态烃包裹体，颗粒间可见残留沥青，×200 tr；d.c中的单一液态烃相包裹体在显微荧光下发黄色荧光，×200 uv；e.样品编号BG-1，石英次生加大边中的单一液态烃包裹体，颗粒间可见残留沥青，×100 tr；f.e中的单一液态烃包裹体在显微荧光下发蓝色荧光，×100 uv；g.样品编号BG-1，穿石英颗粒裂纹中见不发荧光单一气相包裹体，×100 tr；h.g的局部放大，×200 tr。tr—透射光；uv—紫外光
图版1.
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图 2 巴贡组不同类型包裹体均一温度分布
Figure 2. The temperature of different fluid inclusions in the Bagung Formation
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