济阳坳陷页岩油富集要素及地质甜点类型划分

为了明确济阳坳陷页岩油富集主要控制因素,对甜点类型进行合理划分,以济阳坳陷页岩系统取芯井获取的大量地层、地化测试资料为重要研究基础,结合产能,落实了控制页岩油高产富集的主要因素,划分了页岩油地质甜点类型.结果表明:富含碳酸盐矿物的富有机质纹层状页岩是济阳坳陷页岩油储集的最有利岩相;岩相(组合)、埋深和成岩演化,地层压力以及烃类流体性质(原油密度和黏度)是控制页岩油富集高产的关键因素;页岩油高产富集要素之间关系密切,中高演化程度、高孔隙度发育带与游离油窗吻合(3200～3800 m);页岩油地质甜点划分充分考虑了页岩油富集、可动及高产要素,在原本页岩油类型划分的基础上,使页岩油类型更加具体,采取生油-储油-产油等因素先后排列的顺序进行命名,突出了夹层在济阳坳陷页岩油勘探开发中的重要作用.

Shale oil enrichment elements and geological dessert typesin Jiyang Depression

Taking the shale of the paleogene in the Jiyang Depression of Bohai bay basin as the study object, the basic geological characteristics of the shale reservoir were clarified through the detailed observation of the core, the observation of high-pressure mercury injection in the thin section of the rock, and the element analysis of the electron probe.Based on a large number of geochemistry test data obtained from coring Wells in the shale system and shale oil production capacity, the factors of high production and enrichment of shale oil were determined, and the study on the types of shale oil geology showed that the lamination facies rich in carbonate minerals was the most favorable facies for shale oil storage in jiyang depression.The buried depth of lithofacies, diagenetic evolution, formation pressure and total organic carbon content are the key factors to control the enrichment of shale oil. There is a close relationship between the factors of high yield and enrichment of shale oil, and the favorable depth interval of reservoir space (porosity and pore structure) is consistent with the depth interval of shale oil development, that is, the development zone of medium-high evolution and high-porosity zone is in good agreement with the free oil window (3200~4000m).The secondary pore development zones of the retention peak zone in the overpressure section of hydrocarbon fluids are consistent with each other.Based on the original classification of shale oil types, the type of shale oil was made more specific by taking into full consideration the factors of shale oil enrichment, mobility and high yield. The names of the factors, such as source oil, storage oil and production oil, were adopted to highlight the important role of interlayer in the exploration and development of shale oil.