Wireline Borehole Logging for Dam Geophysical Investigation

Site investigation using Robertson Geo wireline geophysical logging in test boreholes is available at all stages of the working life of the Dam:

Concept

Characterizing ground conditions for feasibility studies

Design

Ground investigation to feed into the design process

Build

Targeted ground investigation providing detailed data in key areas

Working Life

Routine monitoring

Events (e.g. overload)

Targeted evaluation of to assess condition or potential damage

Upgrade/Replacement

Investigation to feed into the decision making process

Typical Robertson Geo subsurface probes used for Dam Site investigations:

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Geotechnical

High Resolution Acoustic Televiewer (HRAT)

Fractures and bedding

High Resolution Optical Televiewer (Hi-OPTV)

Fractures and bedding

3-Arm Caliper

Quality control

Borehole Geometry

QC, X & Y caliper, stress orientation

PS Logger

Vp, Vs, small strain moduli

Formation Density

Density, small strain moduli

Hydrogeological

Electric Log

Resistivity, SP

Induction Log

Conductivity

Focussed Electric (Guardlog)

Resistivity

Dual Neutron

Porosity

Impeller Flowmeter

High flow rates

Heat-Pulse Flowmeter

Small flow rates

Temperature Conductivity

Fluid temp and conductivity

Structural

High Resolution Acoustic Televiewer (HRAT)

Fracture identification/orientation

High Resolution Optical Televiewer (Hi-OPTV)

Fracture identification/orientation

Downhole Camera

Physical inspection

Surface deployment systems

Mini winch and 600m winch

Micrologger 2 and Winlogger software

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