显微荧光光谱已经成为流体包裹体系统测试分析中较为成熟的一项技术, 可用于区分不同类型的原油与油包裹体, 从而为研究含油气盆地的油气成藏历史提供重要依据。 不同来源的原油在运聚的过程中可能会发生不同程度的混合作用, 为了有效识别这一类地质过程, 基于不同比例的原油配比混合实验, 研究原油混合后的显微荧光光谱的具体变化特征。 结果表明: 原油混源使得显微荧光光谱参数λmax, QF-535和CIE-XY发生了非线性变化, 具体表现为混源后原油的荧光光谱参数均介于两个端元油之间, 混源油中某一端元油的比例越大, 其荧光光谱参数越靠近这一端元油。 在CIE-XY色品图中主要表现为非线性渐变的荧光颜色特征。 光谱谱形的改变主要表现为谱形由“单峰型”变为“双峰型”和“三峰型”, 同时主峰波长和次峰波长保留了两个端元油的信息; QF-535与混源比例可建立曲线用来定量计算两端元油的相对贡献度。 综合上述荧光光谱参数和谱形的变化特征, 利用原油和油包裹体的显微荧光分析, 识别出东海盆地西湖凹陷A气田有三种不同类型原油充注, 中间还发生了一次原油混源作用, 即蓝绿色荧光原油和黄色荧光原油发生了混合, 定量计算其混源程度为介于47%~55%。

The microscopic fluorescence spectroscopy has become a mature technology of fluid inclusions test and analysis system, which is used to distinguish different types of crude oil and oil inclusions. These would be the important basis to study the history of hydrocarbon accumulation of petroleum basins. The mixture of crude oil from different sources could occur in migration and accumulation process. In order to effectively identify the type of geological process, mixing ratio of crude oil experiment has been carried out. This study result shows that mixing of crude oil make fluorescence color and spectral parameters(λmax, QF535 and CIE-XY) change nonlinearly. Fluorescence spectral parameters of mixed oil is between end member oil A and B. The greater A or B ratio of mixed oil, the closer to A or B. Fluorescence color of mixed oil show nonlinear and gradual change in CIE-XY chromaticity diagram. Variation of spectral spectrum shape show that single peak is changed into double and three peaks. The relationship between QF535 and degree of mixing could calculate quantitatively relative contribution. Mixing different types of crude oil make spectral spectrum shape changes, which present characteristics of two peaks and three peaks but not unimodal peak. The main and subsidiary wavelength reserve wavelength information of end member oils. Based on variation characteristics of fluorescence spectrum, there are three different types of oil including blue, blue-green and yellow fluorescing oil filling in the bottom member of Pinghu formation in A gas field. At the same time, there also was a mixing process of blue-green fluorescing oil and yellow fluorescing oil. The degree of mixing is 47%~55%.