Dual Laterolog tools are electrode tools designed to produce reliable formation resistivity measurements in boreholes containing saline drilling fluids. They operate by "focusing" a survey current into the formation. Dual Laterolog instruments are superior to induction instruments in high resistivity (>100 ohm-m) formations and/or well-bores with drilling fluids more conductive than the in-situ formation waters.
- Determine formation resistivity in saline mud systems and high formation resistivities
- Qualitatively indicate permeability
- Formation evaluation, including hydrocarbon/water contact