页岩油储层储集空间分类方法研究——以高邮凹陷阜二段为例  

Study on the classification method of shale oil reservoir storage space:A case of the second member of the Funing Formation in Gaoyou Sag

作　　者：钱诗友[1] QIAN Shiyou(Exploration Management Department of Jiangsu Oilfield Company,SINOPEC,Yangzhou 225009,China)

机构地区：[1]中国石化江苏油田分公司勘探管理部,江苏扬州225009

出　　处：《复杂油气藏》2025年第1期1-8,共8页Complex Hydrocarbon Reservoirs

基　　金：中国石油化工股份有限公司科技部项目(P21113、P23189)。

摘　　要：为了提高页岩油储层“甜点”区预测精度,有必要对页岩油储层空间进行分类。以高邮凹陷古近系阜宁组二段(简称阜二段)储层为例介绍一种页岩油储层储集空间分类方法。通过压汞实验分析孔-喉分形特征,将孔-喉划分为3类,分别为孔径<100 nm、100~1000 nm和>1000 nm。利用3类孔-喉连通孔隙体积百分比随孔隙度、渗透率变化趋势线的拐点和交点作为划分页岩油储层储集空间界线,将阜二段储层划分为页岩油储层Ⅲ、Ⅱ、Ⅰ和常规储层Ⅲ、Ⅱ、Ⅰ共6类。3类页岩油储层孔隙度和渗透率范围分别为<5%、<0.04×10^(-3)μm^(2),5%~8%、(0.04~0.15)×10^(-3)μm^(2)和8%~11%、(0.15~0.8)×10^(-3)μm^(2);3类常规储层孔隙度和渗透率范围分别为11%~15%、(0.8~2.0)×10^(-3)μm^(2),15%~18%、(2.0~5.0)×10^(-3)μm^(2)和>18%、>5.0×10^(-3)μm^(2)。各类储层中孔径<100 nm、100~1000 nm、>1000 nm孔-喉连通孔隙体积百分比变化趋势明显。In order to improve the prediction accuracy of the'sweet spot'areas in shale oil reservoirs,it is necessary to classify the pore space of shale oil reservoirs.Taking the second member of the Funing Formation of Paleogene in Gaoyou Sag as an example,this paper introduces a classification method for the pore space of shale oil reservoirs.By analyzing the characteristics of pore-throat shape through mercury injection experiments,the pores and throats are divided into three categories:pore diameter<100 nm,100~1,000 nm,and>1,000 nm.The turning points and intersection points of the trend lines of the connected pore-throat pore volume percentage with porosity/permeability are used as the boundary lines for classifying shale oil reservoir pore space,dividing the second member of the Funing Formation into six categories:shale oil reservoirs Ⅲ,Ⅱ,Ⅰ,and conventional reservoirs Ⅲ,Ⅱ,Ⅰ.The ranges of porosity and permeability for the three types of shale oil reservoirs are<5%,<0.04×10^(-3)μm^(2),5%~8%,0.04~0.15×10^(-3)μm^(2),and 8%~11%,0.15~0.8×10^(-3)μm^(2),respectively;the ranges for the three types of conventional reservoirs are 11%~15%,0.8~2.0×10^(-3)μm^(2),15%~18%,2.0~5.0×10^(-3)μm^(2),and>18%,>5.0×10^(-3)μm^(2).The percentage of connected pore-throat pore volumes for pores with diameters<100 nm,100~1,000 nm,and>1,000 nm in each reservoir category shows significant changes in trends.

关 键 词：分类方法 连通孔隙体积 孔-喉 分形特征 页岩油储层 

分 类 号：TE122[石油与天然气工程—油气勘探]