Fluid Saturation in Carbonates

Accurate estimates of saturation (i.e., relative amounts of oil, water, and gas present in the pores of the rock) are necessary to establish reserves. The saturation changes during production show which parts of the reservoir zone are being drained effectively, and these observations are used to help reservoir engineers predict changes in production and plan optimal drainage strategies.

In carbonate reservoirs, the measurement of dielectric dispersion is related to the cementation and saturation factors that are represented in the Archie saturation equation. The Dielectric Scanner multifrequency dielectric dispersion service directly measures water volume and rock textural information to deliver hydrocarbon volume in carbonates. Dielectric Pro software calculates a continuous log of the Archie porosity and saturation exponents, accounting for reservoir variability. It can be advantageous to evaluate saturation prior to invasion of drilling fluids into the formation.

The EcoScope LWD service incorporates resistivity, neutron porosity, sigma and neutron capture spectroscopy sensors located behind the drill bit. Its thermal neutron measurement also enables logging specialists to estimate water saturation independently of traditional resistivity-based measurements.

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