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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 41 (1957)

Issue: 11. (November)

First Page: 2456

Last Page: 2466

Title: Effect of Overburden and Reservoir Pressure on Electric Logging Formation Factor

Author(s): I. Fatt (2)


Previous HitElectricalTop resistance of 21 brine-saturated reservoir sandstones was measured at various internal and external pressures. The resistance, and therefore the electric logging formation factor, increased with increase in the difference between the external and internal pressure. The exponents and coefficients in the Archie and Winsauer relations between formation factor and porosity were found to be functions of this difference in pressure. For a given sandstone, formation factor increases more rapidly with decrease in porosity during compression than would be expected from the average line through the formation factor versus porosity data for the 21 core samples.

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