Resistivity Logging

Resistivity is the ability of a substance to impede the flow of an electrical current. This is a very important rock property in formation evaluation as it helps to differentiate between formations filled with salty waters (good conductors of electricity) and those filled with hydrocarbons (poor conductors of electricity). Hence, a difference in resistivity exists between rocks filled with hydrocarbons and those filled with formation water. Resistivity and porosity measurements are used to obtain values of water saturation to help evaluate producibility of the formation.

Two categories of resistivity logs are: induction and laterolog. The laterolog tools use electrodes to inject a current on the formation and to measures voltages at different points in the tool. The induction tools use coils and magnetic fields to develop currents in the formation whose intensity is proportional to the conductivity of the formation. The intensity of these currents is measured on receiver coils in the tool. Halliburton provides offerings of both types.

ADR™ Azimuthal Deep Resistivity Sensor
LWD sensor provides deep reading (up to 18 feet into the formation), directional and high-resolution images that give early warning of approaching bed boundaries before the target zone is exited . Also provides a traditional multi-frequency compensated resistivity sensor. This one tool provides over 2,000 unique measurements for both precise wellbore placement and more accurate petrophysical analysis.
AFR™ Azimuthal Focused Resistivity Sensor
LWD sensor produces high resolution resistivity images for identifying dip, fractures and borehole breakout. Also provides an omni-directional, laterolog-type resistivity data, electrical images of the formation, and at-bit resistivity (ABR) measurement.
Dual Laterolog (DLLSM) Formation Resistivity Log Service
Wireline service that measures the resistivity of a volume of formation close to the borehole (shallow resistivity) and the resistivity far from the borehole (deep resistivity).
EWR®-PHASE 4 Resistivity Sensor
LWD sensor delivers excellent vertical resolution in low-resistivity, thinly-bedded formations in boreholes from 3-3/4 to 30 inches.
Hostile Array Compensated True Resistivity (H-ACRt™) Tool
Rated to 500°F and 30,000 PSI. Wireline induction tool that consists of a single transmitter operating at three frequencies and six receiver antennas with spacing from 6 to 80 inches. It gives resistivity values at 5 different depths of investigation and with the same vertical resolution (either 1, 2, 4 ft).
Hostile Dual Induction Log (HDIL™) Tool
Rated to 500°F and 25,000 PSI. Wireline tool provides three resistivity measurements: short normal, medium induction, and deep induction.
M5™ Integrated LWD Service
Integrated LWD service provides formation evaluation answers from resistivity and azimuthal gamma ray sensors and drilling optimization answers from vibration and pressure sensors.
Micro-Spherically Focused Log (MSFL®) and Microlog (ML)
Wireline tool developed to eliminate borehole effects and achieve superior shallow investigation; provides two resistivity and caliper measurements.
Xaminer™ - MCI
Halliburton’s Xaminer™ Multicomponent Induction (MCI) tool enables the evaluation of anisotropic formations by measuring the formation resistivity both vertically and horizontally at differentdepths of investigation.