利用油包裹体微束荧光光谱判识油气充注期次

基于石油的荧光性, 通过常规荧光光谱方法, 对油包裹体的荧光光谱进行定量化描述, 利用其主峰波长、最大荧光强度及红/绿商等属性参数, 根据主峰波长与最大荧光强度、主峰波长与红/绿商的相关关系特征, 可以便捷而有效地开展油气充注期次的判识.民丰洼陷沙三段岩性油气藏储层的15块流体包裹体样品检测结果表明, 发黄色荧光的油包裹体荧光光谱结构和形态相似, 其主峰波长一致; 而发蓝白色荧光的油包裹体荧光光谱具有2种类型: 一类与黄色荧光油包裹体荧光光谱结构和形态相似, 主峰波长一致, 表现出同源特征; 另一类明显发生"蓝移", 表现出异源特征.主峰波长与最大荧光强度, 以及主峰波长与红/绿商的相关关系均表现出3种特征类型.因此, 可判定民丰洼陷沙三段岩性油气藏在其地质历史时期共经历了3期油气充注. 

Identification of Hydrocarbon Charging Events by Using Micro-Beam Fluorescence Spectra of Petroleum Inclusions

Based on the fluorescence property of petroleum, conventional fluorescence spectroscopy was employed to quantify the fluorescence spectra of petroleum inclusions. According to the characteristics of the main peak wavelength (λ_max), the maximum fluorescence intensity (I_max), the red-green quotient (Q_650/500), and the relationship between them, the hydrocarbon charging events can be identified easily and effectively. The study of 15 fluid inclusion samples from the Es₃ Member of the Shahejie Formation in Minfeng sag indicates that the main peak wavelength of fluorescence spectra for petroleum inclusions with yellow fluorescence colors is consistent, and that of petroleum inclusions with white bluish fluorescence colors falls into two types: one is the same as that of the yellow fluorescence petroleum inclusions, and the other is obviously blue shifted. In addition, the relationship between λ_max and I_max, and the relationship between λ_max and Q_650/500 both display 3 specific types, which indicates that the lithologic reservoirs of the Es₃ Member of the Shahejie Formation in Minfeng sag underwent 3 hydrocarbon charging events in the geological history.