Core-log integration Alberto Malinverno Well Logging Principles and Applications G9947 - Seminar in Marine Geophysics Spring 2008
Core-log integration
Alberto Malinverno
Well Logging Principles and ApplicationsG9947 - Seminar in Marine Geophysics
Spring 2008
Core-log integration issues
1. Measurement resolution
2. Depth matching
3. In situ versus laboratory conditions
Core sample depth
Drilled interval
Recovered intervals
Shallowest possible depth
Deepest possible depth
Depth uncertainty
Missing interval
Core sample
20 300
50
100
150
200
250
300
Depth
(m
bsf)
Salinity300 400 500 600
Chlorinity (mM)0 0.2 0.4 0.6
0
50
100
150
200
250
300
GH saturation
Thin sands(1-3 cm)
9 cmsand
a b c
23 cmsand
Fig. 4 - Malinverno et al.
190
195
200
205
210
215
220
225
Depth
(m
bsf)
SFLU resistivity
(ohm m)
Hole U1325C
2 MHz 16in phase
resistivity (ohm m)
Hole U1325A
190
195
200
205
210
215
220
225
Ring resistivity
(ohm m)
Hole U1325A
9 cmsand
Depth
uncertainty
of sample
a b c
1 10 1 10 1 10
Fig. 5 - Malinverno et al.
0.2 0.4 0.6 0.8
50
100
150
200
250
Depth
(m
bsf)
Porosity1
Resistivity (ohm m)0 0.2 0.4 0.6
50
100
150
200
250
GH saturation
R0 R
t
Fig. 6 - Malinverno et al.
10
a b c
in si·tuin the natural or original position or placePronunciation: (")in-'sI-(")tü, -'si-, -(")tyü also -'sE-, -(")chüFunction: adverb or adjectiveEtymology: Latin, in positionDate: 1740
Effective stress
• Stress or pressure: ρgh• Lithostatic stress at base column:
g(ρwhw + ρshs)• Hydrostatic pore pressure at
base column: gρw(hw + hs) • Effective stress (Terzaghi, 1936):
lithostatic stress – pore pressure
hwρw
hsρs
!e! = ghs("s ! "w)= ghs(1 ! #)("g ! "w)Base column
Wat
erSe
dim
ent