Water Saturation and Movable Fluids

To fully take advantage of all log measurements, a simultaneous, multimineral matrix solver is employed. The dry weight fractions of various minerals such as aluminum, calcium, magnesium, iron, and sulfur are input from the spectroscopy data. Bound and free fluids are input from the magnetic resonance data along with bulk density, shallow and deep resistivity, and neutron porosity.

The measurements are simultaneously used to drive an inverse problem that solves for the volumetric fractions of the minerals and fluids responsible for the log responses. With the volumes of minerals and fluids determined, a synthetic set of logs are generated via forward modeling. These volume-based “reconstructed” logs are compared to the original measured logs. Agreement between the original and reconstructed logs validates the petrophysical results.

Water Saturation and Movable Fluids

Direct Measurement of
Water Volume and Salinity

Dielectric Scanner multifrequency dielectric dispersion service measured water-filled porosity of individual thin beds in Venezuela to determine high-quality reservoir zones.The proVISION Plus MR log helps characterize two additional laminated sand–shale sequences.Quality control of Schlumberger multimineral evaluation of LWD data shows error to be extremely low.Logging showed a highly laminated interval with net to gross 40% to 60% in the lower setion and 30% to 40% in the upper section. Porosity in the sand laminations is 30%.
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