Geochemical Characteristics of Synthetic Hydrocarbon Inclusions in Rock Salt-Crude Oil and Their Implication for Oil Source Comparison
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摘要: 油气包裹体广泛应用于油气成藏研究,但油气包裹体能否继承母油荧光及地球化学特征等,尚缺乏直接的实验证据。本文在开放体系下用NaCl挥发结晶法对一轻质原油进行合成烃类包裹体实验,通过镜下观察和激光剥蚀色谱-质谱技术分析合成的烃包裹体和母油的荧光特征、成分特征及地化特征,研究两者的异同点。结果表明,在NaCl合成烃类包裹体中共发现三种相态的包裹体:纯液相烃包裹体、气液两相烃包裹体和气油水三相包裹体;共有绿黄色荧光、蓝色荧光两种不同颜色的荧光特征。相对于母油,合成包裹体的饱和烃和芳烃类化合物中的轻质组分含量较低,可以推测在母油被捕获成为包裹体的过程中,不同的化学成分存在差异性捕获。但合成包裹体的Pr/Ph等地化参数和不同系列化合物相对含量与母油相差不大,能很好地反映母油的沉积环境等地化特征。因此,包裹体成分信息可以应用于油源对比分析。
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关键词:
- 合成烃包裹体 /
- 母油 /
- 激光剥蚀色谱-质谱分析 /
- 地化参数 /
- 油源对比
Abstract: Petroleum inclusions are widely used in hydrocarbon accumulation, but the lack of direct experimental evidence means that proof cannot be determined as to whether petroleum inclusions inherit the fluorescence and geochemical characteristics from crude oil. The petroleum inclusion in NaCl crystal is synthesized using the NaCl evaporation crystallization method under the open system and is reported in this paper. The fluorescence, composition and geochemical characteristics of synthesized petroleum inclusion and crude oil were studied by Microscope and Laser Ablation GC-MS. Three kinds of petroleum-bearing inclusions are identified at room temperature, such as liquid single-phase hydrocarbon inclusion, gas and liquid two-phase hydrocarbon inclusion, and gas, petroleum and water three-phase inclusion. These petroleum-bearing inclusions show yellow-green and blue-green fluorescence. The synthesized petroleum inclusions have lower content of light fractions in saturated hydrocarbons and aromatics than the crude oil. It can be inferred that the selective-capture of different compounds occur during the trapping process of synthesized petroleum inclusion. However, both the crude oil and synthesized petroleum inclusion show similar Pr/Ph ratios and the relative content of different types of compounds, which can be used to discriminate the sedimentary environment and other geochemical characteristics. Therefore, the geochemical composition of petroleum inclusion is still a powerful and reliable tool to trace the source rock of the crude oil, using the method described here. -
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