岩石物理实验“四参数”关系研究.doc
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利用核磁共振实验数据计算相对渗透率曲线研究
白松涛1,万金彬1,黄龙兴
(1中国石油集团测井有限公司油气评价中心,陕西 西安 710077;中国石油集团测井有限公司国际事业部,)
摘要:探讨储层岩心的核磁共振τ2谱数据与相对渗透率曲线之间的相关关系。核磁共振τ2谱用于描述孔隙内流体赋存状态,相对渗透率曲线用以判别润湿性以及多相流体的相对流动能力,根据岩石毛管束模型和磁场物理理论研究推导出基于核磁共振τ2谱的渗透率计算方法,分析核磁共振τ2谱计算储层渗透率中各参数的物理意义出核磁共振τ2谱计算储层相相对渗透率公式,并利用实验数据进行验证后取得良好效果;通过储层动静态参数之间相互转换,拓展核磁共振τ2谱资料的应用范围,为储层特征评价、测井产能预测等提供一定的依据。
关键词:核磁共振τ2谱;相对渗透率曲线;渗透率;毛管压力;孔隙结构
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Research On Calculating Method Of Relative Permeability Curve By NMR T2 Distribution
BAI Songtao1,WAN Jinbin,
(Evaluation Center,China Petroleum Logging CO. LTD.,Xi’an,Shaanxi 710077, China International Projects Department,China Petroleum Logging CO. LTD.,, 102249, China;)
Abstract: Explore the correlation between reservoir core NMR spectral data τ2 and relative permeability curves. NMR τ2 Distribution is used to describe the occurrence of pore fluid, Relative permeability is used to distinguish the wettability and multiphase fluid flow capacity, According to the capillary bundle model and magnetic field of the rock physical theory, to obtain a theoretical relationship between the NMR and permeability, analyzing the physical meaning of each parameter reservoir permeability calculating by NMR spectrum. Deducing the formula which obtains relative permeability of the reservoir using NMR τ2 Distribution, it is validated and achieved good results by using the experimental data. The method can achieve the exchange between the reservoir static parameters and dynamic parameters, and further expand the range of applications for the reservoir characteristics using the NMR τ2 Distribution, provide some references of evaluating the reservoirs and forecasting the capacity by logging.
Key words: NMR τ2 Distribution;Relative Permeability curve;Permeability;Capillary Pressure;pore configuration
0 引言
相对渗透率曲线资料是油藏工程和数值模拟计算中的重要参数,能够计算油井产量和流度比,确定储层中油水的饱和度分布、油水接触面位置及生产纯油的闭合高度,在油田开发计算、动态分析中都是必不可少的资料。随着主要含油气盆地勘探开发程度的不断深入,待探明石油资源的品位明显变差,低渗透油气藏储量占我国每年总探明储量的80%以上,为针对目标储层进行准确的
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