The fluorescence characteristics of individual oil inclusions and molecular composition analysis of oil inclusions in 20 Eocene sandstone samples from the Dongying depression were used to assess the relationship between the fluorescence colors of the oil inclusions and their thermal maturity. The oil inclusions from the Shahejie Formation member III middle submember, member III lower submember, and member IV upper submember samples primarily have yellow fluorescence colors (500 nm < wavelength of the maximum intensity (λmax) < 590 nm), whereas the oil inclusions in the Shahejie Formation member IV lower submember reservoir sample only have blue fluorescence (440 nm < λmax < 500 nm). The molecular maturity parameters from steranes, hopanes, and aromatic hydrocarbons showed that the oil inclusions with yellow fluorescence colors have relatively low thermal maturities within a narrow range (0.75%–0.82% vitrinite reflectance equivalent [Requ]), which is significantly lower than that of the sample containing oil inclusions with blue fluorescence colors (1.26% Requ). The yellow fluorescent oil was interpreted to be related to the main oil generation and expulsion process, whereas the blue fluorescent oil was mainly controlled by the thermal cracking process of C14+ aromatic hydrocarbons in source rocks, reservoirs, and oil inclusions. This study demonstrates that the fluorescence colors of oil inclusions may be good indicators of thermal maturity in oil systems charged from oil-prone source rocks and, for the first time, makes it possible to quantitatively predict the thermal maturity of oil inclusions based on their fluorescence characteristics. However, biodegradation, water washing, phase separation, and trapping fractionation should be considered before using this correlation because these processes can also influence fluorescence colors.

中文翻译：

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基于渤海湾盆地东营坳陷油包裹体荧光和分子地球化学数据定量预测流体包裹体中油的热成熟度

利用东营坳陷20个始新世砂岩样品中单个油包裹体的荧光特征和油包裹体的分子组成分析，评估油包裹体的荧光颜色与其热成熟度之间的关系。沙河街组Ⅲ中亚段、Ⅲ下亚段、Ⅳ上亚段样品的油包裹体主要呈黄色荧光（500 nm <最大强度波长（λmax）< 590 nm），而沙河街组Ⅳ下亚段储集层样品仅有蓝色荧光（440 nm < λmax < 500 nm）。甾烷、藿烷的分子成熟度参数 和芳烃表明，黄色荧光的油包裹体在较窄的范围内（0.75%~0.82%镜质反射当量[Requ]）具有较低的热成熟度，显着低于含有蓝色荧光的油包裹体的样品颜色（1.26% 要求）。黄色荧光油被解释为与主要的生排油过程有关，而蓝色荧光油主要受烃源岩、储层和油包裹体中C14+芳烃的热裂解过程控制。这项研究表明，油包裹体的荧光颜色可能是来自易油源岩的油系统热成熟度的良好指标，并且首次，使得基于其荧光特征定量预测油包裹体的热成熟度成为可能。然而，在使用这种相关性之前，应考虑生物降解、水洗、相分离和捕获分馏，因为这些过程也会影响荧光颜色。