射频段岩心介电频散特性的实验研究——实验用冀东油田某区块岩心

Experimental research of dielectric dispersion property in radio frequency

实验研究了不同频率下岩心相对介电常数与矿化度、含水饱和度等影响因素之间的关系,当含水饱和度较低时,相对介电常数随矿化度的增大而降低,当含水饱和度增大到一定程度时,不同矿化度的岩心介电常数曲线基本重合;岩石介电常数随含水孔隙度的升高而近于线性增大;含水饱和度越高介电常数越大,频散程度也越大。

By analyzing the relationship between the dielectric constant to salinity,water saturation etc.at different frequencies,the analysis suggests that in low water saturation condition,the dielectric constant decreases with the increase of salinity and when water saturation reaches a certain degree,the dielectric constant curves of different salinities are basically coincident.Meanwhile,the relations in terms of changes of the frequency-dependent dispersion amplitude and the frequency-dependent dispersion coefficient with various salinities and water saturation are established.The relationships between the dielectric constant and various factors are clarified.When the water saturation is higher,the dielectric constant and the degree of dispersion are bigger.