On: “Theory of microwave dielectric constant logging using the electromagnetic wave propagation method,” by R. Freedman and J. Vogiatzis (GEOPHYSICS, May, 1979, p. 969–986).

Geophysics ◽  
1980 ◽  
Vol 45 (10) ◽  
pp. 1530-1532 ◽  
Author(s):  
H. Pascal ◽  
D. Rankin
Keyword(s):  
Dielectric Constant ◽  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Plane Wave ◽  
Electromagnetic Wave Propagation ◽  
Wave Model ◽  
Well Logging ◽  
Microwave Dielectric ◽  
Interesting Paper ◽  
Wave Propagation Method

In the interesting paper by Freedman and Vogiatzis, the Schlumberger EPT dielectric well logging method is discussed. The authors pay particular attention to the analysis of the formation traveltime and calculate, for several realistic sources, the corrections to the values of the plane wave model used by Schlumberger.

To: “Theory of microwave dielectric logging using the electromagnetic wave propagation method” GEOPHYSICS (1980), v. 45, p. 1532–1533

Geophysics ◽  
1981 ◽  
Vol 46 (2) ◽  
pp. 236-236
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Electromagnetic Wave Propagation ◽  
Microwave Dielectric ◽  
Wave Propagation Method

Our reply to the discussion by H. Pascal and D. Rankin of our paper “Theory of microwave dielectric logging using the electromagnetic wave propagation method” appeared in Geophysics (1980), v. 45, p. 1532–1533. This reply contained a misprint and some errors.

Further discussion on attenuation and dispersion of electromagnetic wave propagation in fluid‐saturated porous rocks and applications to dielectric‐constant well logging

Geophysics ◽  
1983 ◽  
Vol 48 (10) ◽  
pp. 1373-1380 ◽  
Author(s):  
H. Pascal
Keyword(s):  
Dielectric Constant ◽  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Electromagnetic Wave Propagation ◽  
Phase Model ◽  
Phase System ◽  
Porous Rocks ◽  
Two Phase ◽  
Advantages And Disadvantages ◽  
Attenuation And Dispersion

This paper presents a more detailed analysis of some basic problems of electromagnetic wave propagation through a porous medium saturated with fluid, associated directly with quantitative interpretation of dielectric constant logging. The advantages and disadvantages of a new approach, in which fluid‐saturated porous rock is considered as a two‐phase system, are discussed and compared with those obtained from the single‐phase model. It is shown that the two‐phase model may provide a better interpretation of dielectric constant logging.

Theory of microwave dielectric constant logging using the electromagnetic wave propagation method

Geophysics ◽  
1979 ◽  
Vol 44 (5) ◽  
pp. 969-986 ◽  
Author(s):  
R. (Bob) Freedman ◽  
John P. Vogiatzis
Keyword(s):  
Dielectric Constant ◽  
Wave Propagation ◽  
Dielectric Properties ◽  
Phase Shift ◽  
Plane Wave ◽  
Computer Experiments ◽  
Theoretical Models ◽  
Dielectric Constants ◽  
Mud Cake ◽  
Wave Propagation Method

The composite dielectric constants of earth formations at microwave frequencies are strongly dependent on formation water saturations and relatively independent of water salinities. Therefore, microwave frequency dielectric constant logging offers an attractive new electromagnetic (EM) method of formation evaluation. The EM wave propagation method of dielectric constant logging attempts to deduce the dielectric properties of earth formations from phase shift and attenuation measurements of EM field, which have been propagated in the formation. A device which utilizes this method of well logging has been proposed by Calvert (1974) and Rau (1976) in two recent U.S. patents. We discuss the basic physics underlying the operation of a device of this type and describe the plane wave procedure discussed by these authors for relating the phase shift and attenuation measurements made by such a device to the formation dielectric properties. This procedure is suspect, since it is based on an unrealistic plane wave model which fails to treat the radiation field correctly and ignores the presence of a layer of mud cake which separates the antenna pad from the formation. To determine the errors likely to be inherent in using this procedure in practice, we consider several simple theoretical models of an EM wave propagation tool. Computer experiments performed on these theoretical models indicate that the apparent formation traveltimes obtained by using this procedure are semiquantitatively accurate with relative errors less than five percent in most cases. For our theoretical models, correction plots or departure curves are demonstrated which enable one to deduce the true formation traveltimes, given the apparent values and a knowledge of the dielectric properties and thickness of the mud cake. The problems which remain if this new method of logging is to attain its full potential (e.g., the accurate determination of formation fluid saturations) are discussed.

Sign in / Sign up

Export Citation Format

Share Document