不同孔隙结构页岩油储层可动流体分布特征  

Distribution Characteristics of Movable Fluid in Shale Oil Reservoirs with Different Pore Structures

作　　者：王继超 崔鹏兴 刘双双 石彬[1] 党海龙 WANG Jichao;CUI Pengxing;LIU Shuangshuang;SHI Bin;DANG Hailong(Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an,Shaanxi 710075,China)

机构地区：[1]陕西延长石油(集团)有限责任公司,陕西西安710075

出　　处：《西安石油大学学报（自然科学版）》2023年第1期59-68,共10页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：延长石油集团重点研发项目“西部长6油藏水平井补充能量开发先导试验研究”(ycsy2020jcky-B-04)。

摘　　要：采用场发射扫描电镜、高压压汞、铸体薄片和核磁共振等实验方法,对长7段页岩储集层孔隙结构分类基础上,开展了可动流体离心实验,定量表征了不同孔隙结构页岩中不同孔径孔喉的可动流体分布特征。结果表明:按照孔隙结构特征可将目标页岩划分为3类,Ⅰ、Ⅱ、Ⅲ类页岩平均可动流体饱和度分别为49.53%、35.61%和21.72%,其中Ⅰ、Ⅱ类页岩中孔径为115~661 nm的孔喉控制的可动流体含量最高,分别占总可动流体饱和度的47.2%和45.4%,而Ⅲ类页岩中44.2%的总可动流体饱和度由孔径25~115 nm的孔喉控制。Ⅰ、Ⅱ类页岩可动流体饱和度与孔隙度、渗透率、小孔和大孔孔隙度、孔喉半径均值和中值、有效孔隙度呈强正相关性,与分选系数呈负相关性;Ⅲ类页岩可动流体饱和度与各参数相关性较差。Using field emission scanning electron microscopy, high pressure mercury injection, casting thin section and nuclear magnetic resonance, the pore structure of Chang 7 shale reservoir was classified, and the centrifuge experiments of movable fluid were carried out to quantitatively characterize the distribution characteristics of movable fluid in the shale with different pore structures.The research results show that the target shale can be divided into three types according to the pore structure characteristics.The average movable fluid saturation of type I,II and III shale is 49.53%,35.61% and 21.72% respectively.Among them, the content of movable fluid controlled by the pore throat with the pore diameter of 115~661nm in type I and II shale is the highest, accounting for 47.2% and 45.4% of the total movable fluid saturation respectively, while 44.2% of the total movable fluid saturation of type III shale is controlled by the pore throat with the pore diameter of 25~115nm.The movable fluid saturation of type I and II shale has a strong positive correlation with porosity, permeability, porosity of small and large pores, mean and median value of pore throat radius, and effective porosity, and a negative correlation with sorting coefficient.The movable fluid saturation of type III shale has poor correlation with various parameters.

关 键 词：可动流体 孔隙结构 核磁共振 影响因素 页岩储集层 

分 类 号：TE349[石油与天然气工程—油气田开发工程]