Finish reading about basic knowledge of permittivity and conductivity

Today, I read three more papers and know about dielectric data more.

Summary:

The task of quantifying petrophysical parameters is divided into two steps.

1.      Invert for the electromagnetic properties of the formation (permittivity and conductivity) from magnitude and phase of electromagnetic wave recorded at the receiver. These electromagnetic properties are obtained for each frequency of operation to obtain their variation with respect to frequency (dispersion).

2.      Valid mixing models are required to relate petrophysical parameters of formation and dispersive electromagnetic properties.

It is shown that the presence of noise in the data can lead to ill-posed inverse problems where multiple answers can be present.

Monte Carlo method is used to study the effect of the noise on the inverted petrophysical properties of the formation.

With the increase of salinity in water, the permittivity of water decreases a little while the conductivity of water increases much. In addition, water salinity will not affect the properties of rocks much.

There are many methods developed for dielectric data. Some of them are for inverting for permittivity and conductivity with different frequencies in order to obtain petrophysical properties. Some of them are for defining quality control criteria for dielectric logging.

Tomorrow, I will start to look for methods to improve the prediction performance of dielectric data. Also, I will try to find papers about how to predict dielectric data accurately.