石油实验地质2017，Vol.39Issue(1)：112-119,8.DOI:10.11781/sysydz201701112
致密油储层微观孔隙结构定量表征--以鄂尔多斯盆地新安边油田长7储层为例
Quantitative characterization of microscopic pore throat structure in tight sandstone oil reservoirs:A case study of Chang7 reservoir in Xin’ anbian oil field, Ordos Basin
摘要
Abstract
The Chang7 tight sandstone oil reservoir in the Xin’anbian oil field in the Ordos Basin has good potential for hydrocarbon exploration. However, the studies of microscopic pore throat structure were limited, which restricted tight oil exploration and long⁃term development. Size, shape and spatial distribution of pore throats in tight oil reser⁃voirs were studied in this paper by using scanning electron microscope (SEM), casting thin section, high⁃pressure mercury injection and Nano⁃CT technologies. Pores in the Chang7 tight oil reservoir in the Xin’anbian oil field were divided into three categories, namely intergranular pores, dissolution pores and microfractures. A large number of nanoscale pore throats developed in this area, which contributed to reservoir capacity and permeability. Pore throat distributions on capillary pressure curves of different samples showed that when threshold pressure is less than 1 MPa, there are many micron⁃sized pores with a good connectivity and pore throats are large tubular and striped with throat diameters being in the range of 100-380 nm. When the threshold pressure ranges from 1 to 3 MPa, there are many nanoscale pores with a good connectivity locally, intragranular dissolution pores are developed and pore throats are tube bundle and spherical shape with throat diameter being in the range of 75-250 nm. When the threshold pressure is greater than 3 MPa, small isolated spherical nanopores occur, leading to a poor vertical connectivity, only local micro⁃fracture development provides storage space, and throat diameter is concentrated in the range of 15-75 nm.关键词
微观孔隙结构/高压压汞/纳米CT/致密油储层/长7储层/新安边油田/鄂尔多斯盆地Key words
microscopic pore throat structure/high-pressure mercury injection/Nano-CT/tight oil reservoir/Xin’ anbian oil field/Ordos Basin分类
能源科技引用本文复制引用
张浩,陈刚,朱玉双,党永潮,陈娟,王恒力,斯扬,白超,李雪..致密油储层微观孔隙结构定量表征--以鄂尔多斯盆地新安边油田长7储层为例[J].石油实验地质,2017,39(1):112-119,8.基金项目
大陆动力学国家重点实验室科技部重点专项经费（ BJ14252）资助。 （）
