泥页岩地层孔隙流体实验数据分析

Analysis of shale fluid experiment data

由于缺乏取心资料和系统研究,使得国内外对于陆相盆地泥页岩含油率的测定还没有一个明确的标准,从而缺乏对泥页岩孔隙流体分布规律的认识。该文从实验室条件分析出发,采用常压干馏法和氦气法分别获取了泥页岩的含水量、含油量和孔隙度。实验结果表明,采用常规方法测量的泥页岩孔隙流体分布规律异于常规砂岩储层,集中表现在:(1)泥页岩地层的含水饱和度与含油饱和度之和大于100%;(2)随着孔隙度的增加,岩石单位含油体积变大,而单位含水体积不变。从测量方法和测量条件出发,剖析了出现该现象的原因,并给出了相应解释。该结果对于泥页岩非常规油气的深入研究和重新认识有一定的参考意义。

There is still no clear standard in determining oil volume of continental basin shale in domestic and abroad due to the lack of coring data and systematic research. Therefore the deeply understanding of fluid distribu- tion law in shale is also lacked. Based on the laboratory conditions today, the water content, oil content and po- rosity of shale are measured by the atmospheric dry distillation method and the helium method. The experimental results show that the pore fluid distribution law in shale is different from conventional sandstone. 1 ） The sum of water saturation and oil saturation is greater than 100% in shale ; 2） With the increasing of porosity, oil volume is also increasing while water volume is constant. A reasonable explanation for the phenomenon is given by analy- zing the experiment methods and conditions. This understanding might be significant for the in-depth research and understanding of unconventional shale reservoir.