岩电影响因素实验及数据处理方法

对影响岩石电阻率的主要因素进行了实验室岩心测量和Archie公式处理.结果表明,岩心饱和程度不足会使胶结指数m值变大,孔隙度指数n值变小,为此必须检验岩心饱和程度并予以校正;泥质影响使测量数据分散,使m、n值均偏小,经阳离子交换量Qv校正可改善与Archie公式的相关性;高饱和水矿化度使m、n值都增大,虽使泥质影响变小,但Qv校正仍属必要;高温高压使m值增大,n值减小;油驱后的n值比气驱后大.给出了饱和程度校正和Qv校正的方法.

Core Resistivity Influence Factor Experiment and Data Processing Method

The laboratory experiment for primary factors affecting the resistivity of core sample and its data processing based on Archie formulae has been studied. The results show that the imperfect saturation increases the cementation factor m and decreases the saturation index n, so that the saturation degree must be inspected and corrected; shale effect scatters the data measured away from Archie formulae, decrease both of m and n, however the cation exchange capacity Qv correction will improve the correlation between the data and Archie formulae; high salinity saturated water increases both of m and n, decreases the shale effect, where the Qv correction is still necessary; high temperature and pressure increase the m, decrease the n; the n after oil drive will be greater than the n after gas drive. The methods of the undersaturation correction and the Qv correction are presented.