Interpretation note: Borehole diameter, fluid or mud properties, casing, invasion, tool centralization, and vertical resolution can alter every response shown here. Logs require calibration and should be interpreted jointly rather than as direct formation-property measurements.
Natural Gamma (GR)
Passive measurement of natural radioactive decay to delineate lithology (Sand vs. Clay).
Physics Principle
Status: Idle
Watch gamma rays (red) emit naturally from the clay layer due to K, U, and Th isotopes.
Watch gamma rays (red) emit naturally from the clay layer due to K, U, and Th isotopes.
Clean Sand
Clay / Shale
Clean Sand
Example Data: GR Log
Electromagnetic Induction (EM)
Primary fields induce secondary eddy currents in conductive formations to map plumes.
Physics Principle
Status: Idle
Tx coil emits alternating field. Conductive layer generates secondary field received by Rx.
Tx coil emits alternating field. Conductive layer generates secondary field received by Rx.
Conductive Leachate Plume
Tx
Rx
Example Data: Conductivity Log
Neutron Porosity
Fast neutrons collide with Hydrogen atoms in pores, thermalize, and return to the detector.
Physics Principle
Yellow: Fast Neutrons.
Blue: Thermal (slow) neutrons returning after hitting Hydrogen.
Rule: Fewer return neutrons = Higher Porosity.
Blue: Thermal (slow) neutrons returning after hitting Hydrogen.
Rule: Fewer return neutrons = Higher Porosity.
Source
Det.
H₂O
H₂O
H₂O
H₂O
Example Data: Porosity Log
Acoustic Televiewer (ATV)
Ultrasonic pulses map the borehole wall. Fractures unwrap as sine waves.
Physics Principle: Top-Down View
The transducer rotates rapidly.
When the beam hits the dipping fracture plane (red), amplitude drops due to acoustic impedance contrast.
When the beam hits the dipping fracture plane (red), amplitude drops due to acoustic impedance contrast.
Example Data: Unwrapped Image Log
NESWN
Nuclear Magnetic Resonance (NMR)
Polarizes hydrogen protons to measure T₂ relaxation, differentiating bound vs. mobile water.
Physics Principle: Proton Spin
Large Pores (Mobile Water)
Small Pores (Bound Water)
Example Data: T₂ Distribution
Laser Induced Fluorescence (LIF)
UV lasers excite PAHs in NAPL plumes, capturing fluorescence emission to map contamination.
Physics Principle
Tool deployed via direct push.
UV Laser fires into formation.
UV Laser fires into formation.
NAPL Source (Diesel)
Example Data: Emission Spectrum
Heat Pulse Flowmeter (HPFM)
Tracks extremely slow vertical groundwater movement using a thermal tracer.
Physics Principle
Status: Ambient upward flow.
Click to trigger heat pulse tracer.
Click to trigger heat pulse tracer.
Example Data: Temp vs Time