应用定量颗粒荧光技术研究岩性油气藏的隐蔽输导通道

Application of Quantitative Grain Fluorescence Techniques to Study of Subtle Oil Migration Pathway of Lithological Pool

应用定量颗粒荧光技术对东营凹陷牛庄洼陷5口井101块沙三段致密储层、薄层粉砂岩进行了定量荧光QGF-E和QGF分析。分析表明,牛24、牛83、牛876、王550、牛872等5口井致密薄储层颗粒具有相对较高的荧光,显示这些较致密的粉砂岩为过去或现在的油气运移路径/运载层,表明致密砂岩、粉砂岩、薄层砂岩可作为烃类运移的通道。这类薄层隐蔽输导通道为深凹带牛庄洼陷深部沙四段上亚段烃源岩生成的油气进入无断层切割的沙三段中、下亚段的砂岩透镜体而成藏提供了重要的依据。该研究结果对于东营凹陷正在进行的隐蔽油气藏成藏机理的研究可能具有重要意义。

This paper applied quantitative grain fluorescence techniques to analyzing the QGF-E and QGF property of 101 rock samples from 5 wells in tight sandstone and thin siltstone in the third section of the Shahejie Formation in the Niuzhuang sag of the Dongying depression. It was observed that both the tight sandstone and thin siltstone show generally high fluorescence abundance of hydrocarbon and therefore suggests that they are possible subtle oil-migration pathways in the present or geological time. These thin subtle oil migration pathways afforded important clues for the research of hydrocarbon accumulation in lithological pools in the middle and lower of Es3 in deep sag zones which has the hydrocarbon source from the upper of Es4 when there is no apparent fault playing oil migration conduits to connect lithologic traps and deep source rocks. This study shows good prospect of QGF techniques in discriminating of oil migration pathways and paleo-oil layer. This study results may have important significance in researching of hydrocarbon accumulation mechanism of subtle reservoirs in the Dongying depression and other areas.