04_geophys logging-trb rev3 (diavik added).pdf
TRANSCRIPT
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Optical and Acoustic Televiewer Borehole Logging Improved Oriented Core Logging Techniques
Tom Eliassen, VTrans; Dorothy Richter, Hager-Richter Geoscience;Heather Crow, Peter Ingraham & Trevor Carter, Golder Associates
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MYTHBUSTERS
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THE PROBLEM:
Highly fractured zones and soil filled joints four
e isodes of foldin and faultin
Folded rock fabric within cut
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THE PROBLEM:
Maintaining core orientation
difficult in highly fractured
rock soil seams up to 4 to6 thick, significant core loss
Local drillers not
accustomed to double-ortriple-tube coring methods
15-foot rockfall boulder in Route 9 ditch
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LIMITED BEDROCK EXPOSURES:
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PROJECT APPROACH:
Collect joint and discontinuity data
and coring program
Geophysical borehole logging using
optical or acoustic methods
Measurement and assessment of
joint planes and laboratory testing
o core samp es.
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OPTICAL AND ACOUSTIC LOGGING:
Early logging developed in the 1960s in
processing and field equipment haveyielded highly mobile and practical
.
Good core drillin and sam lin is still
vital for verification, lab samples and to
assess joint planes
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BOREHOLE TELEVIEWERS:
Can replace Oriented Coring with
wall
Enhance geotechnical data with
high-resolution in situ images
Can be a cost effective
investigation technique
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The Logging System
Small, Portable
Laptop controlleddata collection -
QC on site
Operates
independently of
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e ev ewers: pt ca an coust c
O tical:
High-resolutiondigital image of
borehole wall
Acoustic:
Sonar ima e of
borehole wall
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Plane Slice
Through a ProducesSinusoid in the
N E S W N
Cy in er
Image
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Optical Images in Fault Zones: Collecting Data in Poor Rock
230 m
Bro
18.0 mMi
230.5 m
kenCo
re
singC
ore
231 m
19.0 m
231.5 m
Granite Shale
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INTEGRATION WITH GEOTECHNICAL DATA
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Geotechnical Data and Televiewer Images: One Log Sheet
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Route 9 Improvements, Vermont:
All Terrain Vehicle w/ Gen-Set & Tools Winch, Data Processor and La to
Caliper Tool Optical Televiewer Tool Acoustic Televiewer Tool
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Route 9 Improvements, Vermont:
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Route 9 Improvements, Vermont:
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I-93 Improvements, New Hampshire:
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I-93 Improvements, New Hampshire:
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I-93 Improvements, New Hampshire
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Route 9 Improvements, Vermont:
Optical Televiewer Log
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Route 9 Improvements, Vermont:
Acoustic Televiewer Log
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Televiewer Logging in New York City:
Getting there is half the battle.
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Freedom Tower, World Trade Center Site:
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Televiewer Logging New York City:
NYC Televiewer Log
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Diavik Diamond Mine
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Diavik Diamond Mine
Geotechnical drilling for pit slope
stability investigation
Televiewers introduced oriented
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Diavik Diamond Mine
Advantages: Structural data where its most needed
Zone of Broken Core
Televiewer
interprets data
reliably in
Core Photograph
fracture zone
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Diavik Diamond Mine
Primary Benefits:
Costs reducedfewerstaff, fewer hours on site,
logging
greater confidence in
structural orientations,
,
comprehensive log
sheets
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Tuen Mun Road - Hong Kong
Acoustic and impression packer
core orientation foam coring
Six ma or sheet oints in
micro fractured granite
9000 vehicles/hr Six Lanes
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WellCad Televiewer Tools:
Virtual cores can be
developed from televiewer
mages an v ewe rom a
angles
Virtual Acoustic Core - NYCVirtual Optical Core - VT
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Example Virtual Core plots from OPTICAL Televiewer
Fractures
with
Calcite Veins
in Fault Zone
Soft Clay Interval
Within a Fault Zone
terat on
Valuable for:
DesignCalcite Veins in
DataInterpretation
Contractor
Fault Zone
bidding
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Televiewer Project Considerations:
OPTICAL TELEVIEWER
Borehole diameter 3 12 inches
Clean borehole clear fluid or air filled
good results in air rotary boreholes
ACCOUSTIC TELEVIEWER
borehole diameter 3 12 inches
Logging has produced excellent results in diamond drill andgood - fair results in air rotary boreholes
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Borehole Televiewers: What can be gained?
Accurate structural orientations of
boreholes
improved geotechnical information
traditional oriented core methods
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Challenges Ahead
Televiewer Information; and
Joint Set Data Synthesis.
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Questions?
The best part about trees in Vermont .