页岩油储层实验技术进展及应用——以松辽盆地古龙地区为例

Progress and application of the experimental technologies for the shale oil reservoirs:A case study on Gulong area in Songliao Basin

页岩油是源储一体的非常规资源,页岩油储层实验是进行页岩油勘探开发的重要基础。松辽盆地古龙地区青山口组页岩作为烃源岩已具有完备的分析手段,但作为储层还需进一步开发实验技术。通过建立页岩微—纳米孔隙全尺度分析技术和页岩油激光共聚焦三维重建技术,对松辽盆地青山口组页岩储层特征和页岩油分布状态进行分析。页岩微—纳米孔隙全尺度分析技术可对页岩微—纳米级孔隙成因类型进行定量分析,页岩油激光共聚焦三维重建技术可分析页岩油在不同岩性中的分布特征和不同成熟度页岩油的相对含量、分布规律。研究认为:松辽盆地青山口组纹层状页岩、层状页岩为有利岩性,孔缝体系以粒间缝状孔和页理缝为主,页理对微—纳米级孔隙和裂缝的发育和分布影响较大;成熟页岩油多分布在泥质与夹层的接触部位,砂质或碳酸盐夹层中分布较少,高熟页岩油轻质组分在砂质或碳酸盐夹层中相对富集,重质组分在泥质中相对富集。页岩油储层实验技术为松辽盆地页岩油储层微—纳米级颗粒、孔隙及页岩油赋存状态研究提供了重要支撑。

Shale oil is one of the unconventional resources of the source-reservoir integration.Shale oil reservoir experiments and tests are the important bases for the shale oil exploration and development.Regarding as the source rock in Songliao Basin,Qingshankou-Formation shale has the complete analyzed methods,while as the reservoir,it is necessary to further develop the experimental techniques.Through establishing the full-scale analyzing technology of the shale micro-nano pore and laser confocal 3D reconstruction technology of the shale oil,the characteristics of the shale reservoir and the distribution of the shale oil in Qingshankou Formation in Songliao Basin were analyzed.The former technique can quantitatively analyze the genetic types of the shale micro-nano pore;the latter can analyze the distribution characteristics of the shale oil in different lithologies and moreover the relative content and distribution rules of the shale oil with different maturities.The studies show that the laminated shale and layered shale in Qingshankou Formation in Songliao Basin are the favorable lithologies,and the pore-fracture system are mainly the fissured intergranular pores and lamellation fractures.The lamellation has a great influence on the development and distribution of the pores and fractures.The matured shale oil is mostly distributed in the contact part between the argillaceous matter and interlayer,and the less shale oil is distributed in sandy or carbonate interlayers;the light components of the high-maturity shale oil are relatively enriched in the sandy or carbonate interlayers,while the heavy components are relatively enriched in the argillaceous matter.The experimental technologies have provided the important technical supports for the studies of the reservoir micro-nano particles,pores and the occurrence states of the shale oil in Songliao Basin.