辽河坳陷雷家地区沙四段致密储层孔隙结构及物性下限

发布时间：2018-11-27 18:21

【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。
[Abstract]:In order to study the reservoir properties of Sha 4 member in Lejia area, Liaohe Depression, mineral composition analysis, casting thin section, scanning electron microscope, micron CT scanning and high pressure mercury injection test were used. Pore structure and dominant lithology of tight reservoir are determined by pore throat value, and the lower limit of physical properties is estimated. The results show that the dense reservoir in Dujiatai can be divided into three types: dolomite, fine-grained migmatite and andalite, whose connected pore volume accounts for 3735% and 28% of the total pore throat volume, respectively. The permeability of each lithologic tight reservoir is closely related to the maximum pore throat radius, the main flow pore throat radius has a good correlation, and the permeability is mainly provided by the larger pore throat. The lower porosity limits of dolomite, fine-grained migmatite and andalite are 5.82% and 7.1%, respectively, and the lower limits of effective reservoir porosity are 2.8% and 4.6%, respectively. The conclusion provides a basis for understanding the potential of dense oil resources and guiding exploration in Lejia area.
【作者单位】：中国石油勘探开发研究院;
【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)
【分类号】：P618.13

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