What is it about?

ABSTRACT: The electric formation resistivity factor (F) and the seismic compressional wave velocity (vp) are powerful parameters in understanding the electric and elastic behavior of porous media and in identifying the type of fluid saturating the pore spaces. The formation resistivity factor is a function of various influences, including pore and grain properties; saturation, salinity, and viscosity of pore water; formation and pore-water resistivities; cation-exchange capacity; and clay content. The compressional wave velocity is a function of bulk (grain and fluid) density; type of saturant and degree of saturation; and various elastic moduli, including bulk (pore, fluid, and grain) compressibility. Both parameters (F and vp) are significantly affected by variations of porosity (  ), pressure, and temperature. The three parameters (F, vp, ) were obtained from well log measurements for complex, heterogeneous, and consolidated shaly sandstone reservoirs, saturated with multiphase fluids, offshore of the eastern coast of Canada. Relationships among the three parameters, having coefficients of correlation ranging from 0.75 to 0.92, were obtained. Both F and vp are correlated inversely to porosity and directly to each other. FOR CITATION: Salem, H.S. 2001. Relationships among formation resistivity factor, compressional wave velocity, and porosity for reservoirs saturated with multi-phase fluids. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 23(7-August-September): 675–685. (Published by Taylor & Francis, USA). https://www.tandfonline.com/doi/abs/10.1080/00908310119327 and https://www.researchgate.net/publication/316684944_Relationships_Among_Formation_Resistivity_Factor_Compressional_Wave_Velocity_and_Porosity_for_Reservoirs_Saturated_with_Multiphase_Fluids

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Why is it important?

Combination of electric and seismic techniques to understand the physical behaviour of porous media is one of the good approaches in petrophysical evaluation and characterization of porous media, such as hydrocarbon reservoirs and groundwater aquifers, as well as sediments and soils for engineering purposes. The importance of this study lies in the fact of using a great deal of industrial data obtained from petro;eo, companies to assess the physical behaviour of the Hibernia and Terran Nova oil fields, offshore the eastern coasts of Canada.


It was a great pleasure to write this paper and to present it to geophysicists, petrophysicists, log analysts, petroleum and reservoir engineers, and others concerned. This paper presents some important findings presented in the empirical equations obtained from the analyses og large amount of industrial data. So, the findings presented in this paper can be applied for similar hydrocarbon reservoirs or other kinds of reservoirs have, more or less, the same criteria.

Prof. Dr. Hilmi S. Salem

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This page is a summary of: Relationships Among Formation Resistivity Factor, Compressional Wave Velocity, and Porosity for Reservoirs Saturated with Multiphase Fluids, Energy Sources, August 2001, Taylor & Francis, DOI: 10.1080/00908310119327.
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