摘要
对于孔隙结构复杂的碳酸盐岩储层来说,基于中高渗储层提出的经典核磁共振渗透率计算模型,不能精确的反映低渗储层的孔隙结构复杂性,适用性较差。因此,针对中东H油田低渗碳酸盐岩储层,提出了一种能够反映可动流体孔隙结构的渗透率计算方法。根据压汞曲线的分布特征,确立孔径分类标准,然后通过建立核磁共振T2谱和压汞孔喉半径之间的关系,将孔径分类标准转化为核磁共振横向弛豫时间标准,并将可动流体孔隙精细的划分为易流体孔隙和不易流体孔隙。基于不同孔隙组分含量对渗透率的不同影响,建立了精细评价孔隙结构的核磁共振计算渗透率新模型。通过对比,新方法的计算精度明显高于传统经典模型,对研究区块有很好的适用性。
For carbonate reservoirs with complex pore structure,the classical nuclear magnetic resonance permeability calculation model for medium and high permeability reservoir analysis cannot accurately reflect the pore structure complexity of low permeability reservoirs,so its applicability is poor.Therefore,a permeability calculation method which can reflect the pore structure of movable fluids was proposed for the low permeability carbonate reservoir in the Middle East H oilfield.According to the distribution characteristics of mercury porosimetry curve,the pore size classification criterion was established.Then,the pore size classification criterion was transformed into the transverse relaxation time criterion of NMR by establishing the relationship between the T2 spectrum of NMR and the pore throat radius of mercury porosimetry.The movable fluid pore was divided into easy fluid pore and difficult fluid pore.Based on the different effect of different pore component contents on the permeability,a new permeability calculation model of nuclear magnetic resonance(NMR)for fine evaluation of pore structure was established.The comparison results showed that the accuracy of the new model was much higher than that of the traditional classical model,which had good applicability to the research blocks.
作者
张鹏浩
张占松
朱林奇
杨兵
ZHANG Peng-hao;ZHANG Zhan-song;ZHU Lin-qi;YANG Bing(College of Geophysics and Petroleum Resources,Yangtze University,Hubei Wuhan 430100,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education,Yangtze University,Hubei Wuhan 430100,China)
出处
《当代化工》
CAS
2019年第12期2861-2864,2868,共5页
Contemporary Chemical Industry
基金
国家科技重大专项,项目号:2017ZX05032003-005.
关键词
碳酸盐岩
低渗储层
核磁共振
压汞
流体组分
渗透率
Carbonate rocks
Low permeability reservoir
Nuclear magnetic resonance
Mercury intrusion
Fluid component
Permeability
