原油包裹体中芳香烃组分类型与成熟度关系——以三肇凹陷扶余油层为例

为了明确油包裹体中芳香烃组分与原油成熟度的关系，基于原油的荧光性，利用单个包裹体组分无损分析的荧光光谱方法，对松辽盆地三肇凹陷扶余油层油包裹体荧光光谱进行了定量化描述。首先获取了储层油包裹体荧光颜色类型，然后获得了单个油包裹体荧光光谱图，并对比标准芳香烃在波长为365 nm单色光激发下的荧光光谱主峰波长特征值，最终划分了油气充注幕次及不同幕次油包裹体芳香烃组分类型。研究结果表明：扶余油层发育黄色、黄绿色、蓝绿色和蓝色4种荧光颜色油包裹体，代表了不同成熟度的油气充注。其中第1幕黄色荧光油包裹体主峰对应的波长（λ_max）为576.0~584.5 nm，为低成熟度油充注；第2幕黄绿色荧光油包裹体λ_max为528.7~546.3 nm，为中等成熟度油充注；第3幕蓝绿色荧光油包裹体λ_max为491.6~516.1 nm，为中等成熟度油充注；第4幕蓝色荧光油包裹体λ_max为440.6~456.5 nm，为高成熟度油充注。综合判定得出，三肇凹陷扶余油层在地质历史时期经历了4幕油气充注。油包裹体中芳香烃组分主要有十环芳香烃、并四苯，其次含有红荧烯，并含有少量的胆蒽、蒽；储层油包裹体总体表现出小分子量芳香烃少、大分子量芳香烃多的特征，说明储层包裹体中原油以低-中等成熟度原油为主。通过拟定油包裹体荧光光谱特征与芳香烃组分关系，从而为原油芳香烃组分类型及成熟度研究提供一定依据。

Relationship between aromatic component types and maturity in crude oil inclusions: a case study of Fuyu reservoir in Sanzhao sag

Based on the fluorescence of crude oil, using the fluorescence spectroscopic method of nondestructive analysis of the components of single fluid inclusion, this paper quantitatively describes the fluorescence spectrum of oil inclusions in the Fuyu reservoir, Sanzhao sag, Songliao Basin, so as to clarify the relationship between the aromatic constituents in oil inclusions and the maturity of crude oil. First, this study obtains the types of fluorescence color of oil inclusions in the reservoirs, and also the fluorescence spectrum of a single oil inclusion. Then, a comparison is made on the characteristic value for the main peak wavelength of the fluorescence spectrum of the standard aromatic hydrocarbon under the excitation of monochromatic light at the wavelength of 365 nm. Finally, this paper divides the hydrocarbon charging episodes and the types of aromatic constituents of oil inclusions in different episodes. The research results show that the Fuyu reservoir has oil inclusions with four fluorescent colors, i.e., yellow, yellow-green, blue-green and blue, representing the charging of hydrocarbons with different maturity. Among them, the λ_max of the yellow fluorescent oil inclusions in episode Ⅰ is 576.0-584.5 nm, which represents low-mature oil filling; the λ_max of the yellow-green fluorescent oil inclusions in episode Ⅱ is 528.7-546.3 nm, representing medium-mature oil filling; the λ_max of the blue-green fluorescent oil inclusions in episode Ⅲ is 491.6-516.1 nm, representing medium-mature oil filling; the λ_max of the blue-fluorescent oil inclusions in episode Ⅳ is 440.6-456.5 nm, representing high-mature oil charging. Through comprehensive judgment, the Fuyu reservoir in Sanzhao sag experienced four episodes of hydrocarbon charging during the geological history. The aromatic constituents in oil inclusions are mainly decacyclic aromatic hydrocarbons and naphthacene, followed by rubrene, containing a small amount of cholanthrene and anthracene; the oil inclusions in the reservoirs are generally characterized by less aromatic hydrocarbons with small molecular weight and more aromatic hydrocarbons with large molecular weight, indicating the crude oil in oil inclusions are dominated by low-medium mature crude oil. By formulating the relationship between the fluorescence spectrum characteristics of oil inclusions and aromatic constituents, this paper provides a basis for studying the types and maturity of aromatic constituents in crude oil.