单个油包裹体组分预测及其在油气成藏研究中的应用

了解单个石油包裹体详细的组分信息不仅有助于微观上定量认识油气充注过程中其成熟度的演化，还对精细刻画油气成藏过程中动力演化具有重要意义.根据石油包裹体热动力学原理，利用10个成熟度依次增大的已知组分的原油在匹配其饱和压力和改进气、液相摩尔体积计算前提下，建立了捕获不同组分原油的包裹体均一温度(Th_oil)与其在室温下(20 ℃)气泡充填度(F_v)关系的标准图版，从而通过对比实测的Th_oil和其室温下F_v与标准Th_oil-F_v图版，反推出油包裹体近似等效流体组分.对东营凹陷北带民丰深层油包裹体进行系统荧光分析、显微测温和包裹体体积3D重构等一系列的测定.结果表明丰8井和丰深1井各发生过两幕油气充注，其中丰8井第一幕油气充注(甲烷摩尔含量位于31%~35%之间)对其油气成藏贡献最大；而丰深1井第二幕充注的油气(甲烷摩尔含量大于60%)控制丰深1井凝析油藏成藏.从而为进一步厘定北带深层油气充注PVTxt史奠定基础. 

Individual Oil Inclusion Composition Prediction and Its Application in Oil and Gas Accumulation Studies

The composition information of individual oil inclusion is not only important for quantitatively understanding the maturity evolution of petroleum during the petroleum charging, but also significant for the precise depiction of the dynamic evolution during petroleum accumulation. However, it is very difficult to obtain the detailed composition of individual petroleum inclusion directly by experimental methods. Petroleum inclusions thermodynamics method is an easy and fast indirect method for obtaining the individual petroleum inclusion composition which has been well developed in last ten years. Ten oil composition data with different maturity are used to build the standard relation diagram of oil inclusions homogenization temperature (Th_oil) and the degree of gaseous filling (F_v) at room temperature (20 ℃) using petroleum inclusions thermodynamics method on condition that firstly, match the saturation pressure and improvement of the gas and liquid mole volume calculations, then the equivalent composition can be determined by comparing the measured homogenization temperature and the degree of gaseous filling at room temperature (20 ℃) with the standard Th_oil-F_v diagram. The compositions of petroleum inclusions with different maturity are quantified by a series of measurements on oil inclusions in the deeply buried reservoir in Minfeng area in North Dongying depression including fluorescence analysis, microthermometry and 3D reconstruction of the oil inclusions volume. The results show that both of the well Feng 8 and well Fengshen 1 happened two episodes of petroleum charging events. The first episode oil charging whose methane mole percent content is between 31%-35% contributed to the petroleum accumulation of well Feng 8, and the second episode oil whose methane mole percent content is more than 60% controlled the gas condensate accumulation of well Fengshen 1. The composition prediction results facilitates further establishing the oil and gas charging PVTxt history in the deeply buried reservoir in Minfeng area in North Dongying depression.