Dielectric Logging Application in Complicated Salinity Water Reservoirs

Abstract

Summary The dielectric logging measures high-frequency dielectric properties and resistivity in reservoirs to determine water saturation, formation water salinity, porosity and related rock properties. The first dielectric measurement was introduced in 1980’s, but this technique was not used widely by oil industry due to logging measurement limitations with the issues of complicated interpretation and log data processing. The objective of this study is to correct and calibrate with the dielectric log (ADT) which obtained from fields, and the experimental measurements from laboratory. This paper primarily discussed the relationship among dielectric characterization in laboratory with fresh water and saline solutions at different concentrations to find optimum applications for dielectric data based on the field logging and experiments. In order to achieve this goal, a number of experimental measurements on solutions at different concentrations were conducted with variable frequencies by using LCR analyzer in laboratory based on analysis and simulations with field conditions (fluid salinity, temperature, pressure and frequency etc.). These measurements show that the capacitance of the condenser with liquid and solid dielectrics is directly proportional to the salinity of solutions, inversely proportional to the measuring frequency, and the capacitance is inversely proportional to the square of distance between polar plates.