摘要
为研究辽河坳陷雷家地区沙四段致密储层储集性能,采用矿物成分分析、铸体薄片、扫描电镜分析、微米CT扫描和高压压汞实验等方法,利用孔喉值确定致密储层的孔隙结构和优势岩性,并估算物性下限。结果表明:杜家台致密储层可分为白云岩、细粒混积岩和方沸石岩三类,其连通孔隙体积分别占总孔喉体积的37%、35%和28%。储层普遍发育纳米孔、微米孔和裂缝,各岩性类致密储层渗透率与最大孔喉半径、主要流动孔喉半径相关性较好,呈指数正相关关系,渗透性主要由较大孔喉提供。白云岩、细粒混积岩和方沸石岩类有利储层孔隙度下限分别为5.8%、6.2%和7.1%,有效储层孔隙度下限分别为2.8%、3.3%和4.6%。该结论为认识雷家地区致密油资源潜力并指导勘探提供依据。
Based on mineral composition analysis,casting thin sections and high resolution FIB/SEM image analysis,microtomography(μCT),and mercury injection capillary pressure experiment,the storage capacity of tight reservoirs in the fourth member of Shahejie formation in Leijia district,Liaohe depression was studied.According to pore-radius deriving from employed analysis and experiment,pore-structure and high-quality reservoirs of tight rocks in the study area were determined.Then the physical property cut-off of tight reservoirs was calculated by pore-radius.The tight sedimentation in Dujiatai pay set in the fourth Shahejie formation were divided into dolomite,fine grained diamictite and analcimolith.The ratio of connected pore volume to total volume in the three tight rocks is 37%,35% and 28% respectively.Micron pores,nano pores and micron fractures are common in these tight reservoirs.The permeability of these reservoirs,mainly provided by meso-micron and micro-micron pore throat,is positively exponential correlated to the maximum radii and the main flow aperture of pore throat.The highquality reservoir porosity cut-off of dolomite,fine grained diamictite and analcimolith is 5.8%,6.2% and 7.1% respectively.While the threshold porosity value of the three tight reservoirs is 2.8%,3.3% and 4.6%respectively.This work will contribute to resource potential assessment and tight oil exploration in Leijia district.
出处
《东北石油大学学报》
CAS
北大核心
2016年第1期51-61,4,共11页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2011ZX05028-002)
中国石油天然气股份有限公司科学研究与技术开发项目(2013E-0502)
关键词
致密储层
孔隙结构
物性下限
雷家地区
tight reservoir
pore-structure
physical property cut-off
Leijia district
