Title. Water Saturation from Porosity Logs Alone, Compared with Standard Resistivity Interpretation Gas/Water Systems. Digital Formation, Inc. November 2003. Contents. Benefits Outline Modeling Examples Conclusions. Benefits – Seismic.
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Water Saturation from Porosity Logs Alone, Compared with Standard Resistivity Interpretation
Digital Formation, Inc.
On all plots, porosity increases from right to left, 0-40%.
Invasion profile from porosity log analysis
Pseudo resistivity logs from porosity logs, assuming m=n=2, and Rw=0.1 (input to regular resistivity analysis)
Density and Neutron do not “see” gas
Density and Neutron both “see” gas
Acoustic affected by gas in wellbore (anomalously high Dt)
Neutron routinely“see” gas
Acoustic response dominated
by gas in wellbore
Pseudo resistivity gives
better bed recognition than
original induction log
Variable degree of invasion
from all three porosity logs
Density and Neutron logs“see” gas
Density andNeutron logs“see” gas. Acoustic “sees” residual gas
Reconstructed pseudo resistivitiesaids in invasionprofile interpretation
Estimate of wet resistivity
from porosity logs