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Interpretation basics/1
Image log & dipmeter
analysis course
Interpretation basics
Interpretation basics/2
Borehole
images
and
dipmeters
15
m
1
cm
Core
10000
100
1
0.01
3D seismic
0.01
1
100
10000
Fault throw (m)
Cumulative
fault
density
(faults
per
km)
Walsh, Watterson
& Yielding 1991
Scale of features
Interpretation basics/3
Hole deviation
True dip
Apparent
dip
Apparent and true dip
Interpretation basics/4
Vertical and deviated wells
Interpretation basics/5
Fracture
Bedding
Plane
Vertical
Fracture
Bedding
Plane
45° Deviation
Bedding
Plane
Fracture
Horizontal
Bedding plane Fracture
Viewing perspective
Interpretation basics/6
Local knowledge and calibration
Use local/regional
knowledge, core &
petrography
Interpretation basics/7
Tadpole displays
Interpretation basics/8
Fault
damage
zone
Cumulative
fracture density
Dip summary plots
Interpretation basics/9
Dip Tadpole plots 1:500
Image/core plots 1:5
Tadpole/image plots 1:20
Key interpretation displays
Interpretation basics/10
Key sedimentology plots
Interpretation basics/11
N
Top of
well
Bottom
of well
Major cross-bedding
azimuth change -
change in palaeotransport
Top
Base
Dip azimuth vector plots
Interpretation basics/12
Stereoplots
Interpretation basics/13
Undifferentiated
Azimuthal histograms
Cross-bedding
Parallel
lamination
Scours
Differentiated by surface type
Interpretation basics/14
Dip sticks & seismic plots
Interpretation basics/15
Fault
damage
zone
Cumulative
fracture density
Pores to seismic
Interpretation basics/16
Turbidites
- shale bedding
- sandstone bedding
- bed boundary
- sand bed base
- scours
- slumps
- axial plane
Fluvial
- shale bedding
- cross-bedding
- parallel lamination
- erosion surface
- reactivation surface
- bounding surface
Fractures
- deformation band
- microfault
- fault
- joint
- (resistive/conductive?)
Fit-for-purpose classifications
Dip classification schemes

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