低渗透储层T_2截止值实验研究及其测井应用  

T_2 cutoff value in low-permeability reservoirs and its application.

作　　者：汪中浩[1] 章成广[1] 肖承文[2] 陈新林[2] 宋帆[2] 

机构地区：[1]长江大学地球物理系,湖北荆州434023 [2]中国石油塔里木油田分公司研究院

出　　处：《石油物探》2004年第5期508-510,共3页Geophysical Prospecting For Petroleum

摘　　要：由于一个地区甚至一口井很难有一个统一的截止值,无法用单一的截止值方法区分束缚水和自由流体,因而用核磁共振测井来解释束缚水饱和度存在着实用上的困难。为此,借鉴已发表的实验方法对塔中地区低渗透储层岩心进行了核磁共振实验。在进行实验结果分析时充分考虑到岩石孔隙结构的变化,发现T2截止值与孔隙结构综合指数(k/φ)密切相关,故提出了一种应用于测井解释的变T2截止值方法。在实际测井解释中,采用变T2截止值求得的束缚水饱和度与压汞实验数据较吻合。Nuclear magnetic resonance (NMR) logging data cannot be used directly to infer irreducible water saturation because relaxation time T_2 varies with wells,leading to difficulty in distinguishing irreducible water from free fluid by a unified T_2 value.NMR experiments were designed according to existing publications, and were carried out on low permeability cores from the center of Tarim basin. It was found that the T_2 value was closely related to the composite index of pore structure.A method that uses variable T_2 values in the interpretation of logging data was developed. Practice showed that the irreducible water saturations calculated by the method were in good agreement with mercury penetration experiment data.

关 键 词：T2截止值 束缚水饱和度 测井解释 核磁共振测井 压汞 塔中地区 低渗透储层 岩心 孔隙结构 流体 

分 类 号：TE357[石油与天然气工程—油气田开发工程] P631.813[天文地球—地质矿产勘探]