Given the significantly different levels of optimism in the research from the past 30 years, it is still unclear how electrical induced polarization (IP) contributes to the petrophysical calculation of shaliness and permeability. As a result, opinions on the potential value of IP approaches within the context of formation evaluation are divided.
The wide dispersion of data previously revealed by IP-shaliness-permeability correlations has been narrowed through novel empirical linkages including time-domain induced polarization (IP) parameters. It is shown that chargeability and excess conductivity or intergranular permeability can be connected smoothly and unambiguously. Several connections have been established based on studies of water-saturated sandstones throughout a broad range of electrolyte conductivity.
As long as three formation constants have been identified through laboratory testing, their field application is feasible. The potential value of induced polarization measurements for petrophysical evaluation is briefly reviewed in light of these findings with greater assurance than was previously justifiable.
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