特低渗储层孔喉结构与剩余油分布关系

Relationship between pore-throat structure and remaining oil distribution
in extra-low permeability reservoir

郭永贵

GUO Yonggui

（中国石油大庆油田有限责任公司第十采油厂，黑龙江 大庆 163000）

 (No.10 Oil Production Plant, Daqing Oilfield Company Ltd., PetroChina, Daqing 163000, China)

为明确大庆长垣外围特低渗透储层微观孔喉结构与剩余油分布的关系，文中选取该地区30块天然岩心进行了水驱油实验，应用荧光显微镜与金相显微镜观察驱油后天然岩心的自然断面。利用景深融合技术对拍摄的荧光照片与金相照片进行加工处理，并利用测量软件测定了孔隙半径、喉道半径与微观剩余油饱和度，对孔隙半径、喉道半径与剩余油分布的关系进行了研究。长垣外围特低渗油藏储层岩石喉道半径普遍较小，目前条件难以取得理想的水驱开发效果，需作进一步开发调整。

 With the purpose of researching the relationship between ultra-low permeability reservoir microcosmic pore-throat structure and remaining oil distribution, 30 natural cores were selected to conduct the water flooding experiment. After the experiment, the natural sections of these cores were observed through the fluorescence microscope and metalloscope. By adopting the depth-of-field fusion technology, the photographs of the fluorescence microscope and metalloscope were disposed. The pore radius and throat radius and microcosmic remaining oil saturation were measured by the software, then the relationship between the remaining oil distribution, pore radius and throat radius was studied. The ultra-low permeability reservoirs around Changyuan commonly have thinner throats and are not suitable for desired water-flooding development effects, which needs further development adjustment.

10.6056/dkyqt201702017