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A numerical technique for an accurate determination of formation resistivity factor using FR-RO overlays method

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Abstract

The exactness of water saturation value for given reservoir conditions depends on the accuracy of Archie parameters a, m, and n. The terms of Archie relationship have been subjected to many laboratory investigations and even more speculation. There are many factors that affect porosity exponent m, saturation exponent n, and tortuosity factor a. Usually, assumptions are made to approximate a and m; often m is 2, while a may be 0.81 or 1.0 depending on the type of lithology. But it is very difficult to fix Archie parameters regardless of reservoir characteristics; rock wettability, formation water salinity, permeability, porosity, and fluids distribution. This work illustrates a simple numerical method to calculate a and m which depends on FR-RO overlays method which is used as hydrocarbon indicator. The method is tested using synthetic and real data to ensure its ability in determining formation factor parameters a and m.

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Abbreviations

F R :

Formation resistivity factor

R o :

Resistivity of fully saturated S.S. (Ω m)

A :

Tortuosity factor

R t :

True resistivity (Ω m)

S w :

Water saturation

R cal :

Calculate resistivity (Ω m)

R-Calc (0.52–1.6):

Calculated resistivity (a-m)

ϕ:

Porosity

R w :

Water resistivity (Ω m)

M :

Cementation exponent

R xo :

Flushed zone resistivity

ϕSyn. :

Synthetic porosity

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Acknowledgments

The authors would like to express their gratitude to Dr. E. M. Abdelrahman, Professor of applied Geophysics, Geophysics Dept., Faculty of Science, Cairo University for his scientific advice and comments.

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Authors and Affiliations

  1. Geophysics Department, Faculty of Science, Cairo University, Giza, Egypt

    Walid M. Mabrouk & Khaled S. Soliman

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  1. Walid M. Mabrouk
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  2. Khaled S. Soliman
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Correspondence to Walid M. Mabrouk.

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Mabrouk, W.M., Soliman, K.S. A numerical technique for an accurate determination of formation resistivity factor using FR-RO overlays method. Arab J Geosci 8, 1291–1297 (2015). https://doi.org/10.1007/s12517-014-1311-4

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  • DOI: https://doi.org/10.1007/s12517-014-1311-4

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