Resistivity logging is perhaps the most important tools available to a petrophysicist.
Today there are a number of different types of electrical logs. There
are tools that can cope with extremely highly resistive borehole fluids
(i.e. oil-based mud systems), which rely upon electromagnetic coupling
and an induced alternating current (Induction logs). The Induction log
actually measures conductivity, and hence is sometimes called the
The modern tool for measuring resistivity in
high salinity (low resistivity) borehole fluids is the Laterolog, which
focuses its current into a thin sheet to improve vertical resolution and
penetration depth. Both the Induction logs and the Laterologs come in
different types, which are sensitive to different depths of
investigation. Hence resistivity determinations for the invaded, partly
invaded and undisturbed rock zones can be measured. In addition, there
are also resistivity devices (i.e. Micro-resistivity tools) that are
designed to measure the resistivity of invaded zones.
The main use of the electrical tools is to calculate the water saturation of a reservoir formation, and hence the STOOIP.
• Determination of Rt
• Indications of lithology
• Sand – Shale Laminations
• Determination of well-to-well correlation
• Invasion profiling for permeability determination
• Identification of fluid contacts
• Determination of Rxo
Features and benefits:
• Combinable with Nuclear, Acoustic, and Auxiliary Logging for a complete Formation Evaluation Solution
• Probe’s portfolio of Resistivity tools can facilitate over 90% of all well types.
• Compatible with Warrior™ Acquisition System
• Customizable to client Surface Acquisition System
• Works on proprietary PTX Telemetry System