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矿化度及水型变化对饱和度评价模型中m、n、B值的影响机理研究
引用本文:杨春梅,王建强,张敏,LI Guang-xuan,李广轩,刘卫东.矿化度及水型变化对饱和度评价模型中m、n、B值的影响机理研究[J].地球物理学进展,2006,21(3):926-931.
作者姓名:杨春梅  王建强  张敏  LI Guang-xuan  李广轩  刘卫东
作者单位:1. 中国石油勘探开发研究院,北京 100083; 2. 大庆油田测井公司,大庆 163000; 3. 中油测井技术服务有限责任公司,北京 100043
基金项目:国家“十五”科技公关项目(2001BA605A09)资助
摘    要:在岩石物理实验的基础上,综合运用水岩相互作用、表面物理、电化学等方面的理论,研究水型及矿化度变化对阿尔奇模型中的m、n值以及Waxman-Smits模型中B参数的影响及作用机理.结果表明,水型及矿化度的变化不仅对m、n、B值产生影响,由于在不同的浓度范围内,地层水矿化度对岩石颗粒表面偶电层厚度及平衡离子活动性的影响不同,还导致Archie公式中的m、n值以及Waxman-Smits模型中的B参数在不同矿化度范围内表现出不同的特征:低矿化度情况下,m、n、B值随着矿化度的降低而迅速减小;而当矿化度升高到一定程度以后,m、n、B值趋于稳定,此时的岩电参数是偶电层中扩散层消失后岩石电学特征的反映.

关 键 词:矿化度  偶电层厚度  平衡离子  迂曲度  m、n、B值
文章编号:1004-2903(2006)03-0926-06
收稿时间:2005-09-10
修稿时间:2005-12-27

Analysis of saline type and salinity effect on parameters m, n and B of saturation evaluation models
LI Guang-xuan.Analysis of saline type and salinity effect on parameters m, n and B of saturation evaluation models[J].Progress in Geophysics,2006,21(3):926-931.
Authors:LI Guang-xuan
Institution:1. Research Institute of china Petroleum Exploration and Development, Beijing 100083, China; 2. Well Logging Company, Daqing Oil field, Daqing 163000, China ; 3. China National Logging Corporation, Beijing , 100043, China
Abstract:Based on petrophysical experiments and water-rock reaction, surface physics and electrochemistry theories, mechanism of water saline type and salinity effect on parameters m and n of Archie equation and parameter B of Waxman-Smits model are studied. Parameters m, n and B are not only related with salinity, but also show different characteristics in different range of salinity. The length of electrical double layer (EDL) λD and activity of counter ion are controlled by electrolyte solution concentration and valence of counter ion. Under lower salinity condition, parameters m, n and B increase with solution concentration. But when the concentration is high enough, parameters m, n and B maintain steady, do not change obviously with salinity. The state of parameters m, n and B keeping steady in the case of high salinity reflects the electricity characteristics of the rock when diffuse layer of EDL disappears in high concentrated salt solution.
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