石油实验地质2018，Vol.40Issue(2)：280-287,8.DOI:10.11781/sysydz201802280
运用高压压汞及扫描电镜多尺度表征致密砂岩储层微纳米级孔喉特征——以渤海湾盆地沾化凹陷义176区块沙四段致密砂岩储层为例
摘要
Abstract
Thirty-two samples of tight sandstone from the fourth member of Shahejie Formation in Yi176 block, Zhanhua Sag,Bohai Bay Basin were selected for high pressure mercury injection and overpressure pore infiltration experiments.The microscopic pore throat structure and permeability of tight sandstone reservoirs,especially the flow characteristics of fluid in nano-and micro-scale throats,were discussed along with their microscopic features observed with environmental scanning electron microscopy(SEM).Experiments showed that the discharge pressure in the study area has a wide distribution. According to the distribution of pore throats and relative permeability,the reservoirs in this area were divided into 4 major types and 6 sub-categories. dv/d(logd)reflects the distribution of pore throats at all levels. Combined with the identification of the relative sizes of pore throats by environmental SEM, the pore throat system in the study area was divided into 4 categories:nano scale,micro-nano scale,nano-micro scale and micro scale,while throat was classified into nano and micro types.According to the correlation analysis,it was found that the nano-scale throats controlled permeability,while the micro throats contributed more to porosity. High pressure mercury injection not only characterizes the structural characteristics of conventional pore throats, but also reflects the size of the micro- and nano-pore throats and the fluid flow characteristics in them, which allows further detailed evaluation of reservoirs.关键词
高压压汞/扫描电镜/微纳米孔喉/致密砂岩储层/渤海湾盆地Key words
high⁃pressure mercury injection/scanning electron microscopy/micro and nano pore throat/tight sandstone reservoir/Bohai Bay Basin分类
能源科技引用本文复制引用
严强,张云峰,付航,姜美玲,王军,隋淑玲,付晗,郝芮,郭明翰..运用高压压汞及扫描电镜多尺度表征致密砂岩储层微纳米级孔喉特征——以渤海湾盆地沾化凹陷义176区块沙四段致密砂岩储层为例[J].石油实验地质,2018,40(2):280-287,8.基金项目
国家自然科学基金面上项目(41572132)和国家自然面上项目(41772144)联合资助. （41572132）
