岩样频率域激发极化电位的实验研究

Experimental Study on Induced Polarization Potential of Rock Frequency Domain

以岩样时间域激发极化电位实验为基础,通过傅里叶变换,把时间域转换到频率域,分析了时间域与频率域激发极化现象的内在联系。在特定频率下得出,随着溶液矿化度的升高,电位幅值降低而相位绝对值增大;随着含油饱和度的增加,极化电位幅值先增大后减小;随着岩石QV的增加,岩样极化电位幅度值逐渐增大。实验结果表明,频率域激发极化法可以克服时间域激发极化法的某些缺点,100 Hz^10 kHz的频段可充分反映岩样的电化学性质。该研究为确定频率域激发极化测井的频率范围提供依据。

Based on the induced polarization potential experiment of rock in time domain,the time domain is translated to frequency domain by Fourier Transform.Analyzed is the inner relationship between the induced polarization in the time domain and frequency domain.Under one specific frequency（such as 100Hz）,we get some conclusions that the amplitude decreases and the absolute value of phase increases with the increase of salinity;the amplitude increases at first and then decreases with the increase of oil saturation;with the increase of cation exchange quantity,the amplitude increases gradually.The results show that induced polarization in the frequency domain can overcome some shortcomings of that in the time domain.100 Hz～10 kHz frequency bound can well reflect the electrochemistry nature of the rock.The above study provides the basis for defining the frequency range of induced polarization well logging.