致密油藏储层微观孔隙特征与可动用性评价

发布时间：2018-05-04 13:59

本文选题：致密油 + 孔隙特征　；参考：《地球科学》2017年08期

【摘要】：致密油储层主要包括致密灰岩和致密砂岩,两者微观特征差异明显.但目前针对致密灰岩和致密砂岩的对比研究相对较少,因此开展致密油藏不同岩性微观孔隙结构特征及可动用性研究具有十分重要的意义.利用低温氮吸附比表面、核磁共振、压汞等方法,从纳米级、亚微米级、微米级孔隙等不同尺度表征了致密灰岩和致密砂岩孔隙结构差异,分析了不同孔隙对渗透率的贡献和对流体赋存的影响,研究了启动压力梯度的差异和喉道对启动压力梯度的影响.以川中灰岩和长庆砂岩为例,结果表明渗透率大于0.01mD储层具备开发潜力,致密灰岩中的亚微米和微米级孔隙是重要的储集和流动空间,致密砂岩中微米级孔隙是重要的储集和流动空间.基于微观实验分析和低渗透油藏评价方法,提出了致密油藏分级评价参数,并给出了分级评价界限,对确定致密油藏攻关目标和优选区块新建产能意义重大.
[Abstract]:Dense oil reservoirs mainly consist of dense limestone and tight sandstone. However, there are relatively few studies on the correlation between dense limestone and tight sandstone, so it is of great significance to study the characteristics and availability of micropore structure of different lithology in dense reservoir. The difference of pore structure between dense limestone and tight sandstone was characterized by low temperature nitrogen adsorption specific surface, nuclear magnetic resonance (NMR), mercury injection and so on, from different scales such as nanoscale, submicron and micron porosity. The effect of different pores on permeability and fluid occurrence is analyzed. The difference of starting pressure gradient and the influence of throat on starting pressure gradient are studied. Taking limestone and Changqing sandstone in central Sichuan as examples, the results show that the permeability is larger than that of 0.01mD reservoir, and the sub-micron and micron porosity in dense limestone is an important reservoir and flow space. Micrometer porosity is an important reservoir and flow space in tight sandstone. Based on microcosmic experimental analysis and low permeability reservoir evaluation method, the classification evaluation parameters of dense reservoir are put forward, and the classification evaluation limits are given, which is of great significance to determine the key target of tight reservoir and the new productivity of selected block.
【作者单位】：中国石油勘探开发研究院渗流流体力学研究所;中国石油西南油气田分公司;
【基金】：国家油气重大专项(No.2017ZX05013-001) 中国石油重大科技攻关项目(No.2016E-1303)
【分类号】：TE311

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