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geophysical log signature and sonic velocity4
10 20 30 40 50 60 70
IW13 GR
0 10 20 30 40 50 60 70
IW14 GR
0 10 20 30 40 50 60 70
IW16 GR
0 10 20 30 40 50 60 70
IW15 GR
1000
1200
1400
1600
1800
2000
2200
2400
2600
1000
1200
1400
1600
1800
2000
2200
2400
2600
1000
1200
1400
1600
1800
2000
2200
2400
2600
1000
1200
1400
1600
1800
2000
2200
2400
2600
trans
gres
.re
gres
sive
max.flood
OldsmarFormation
Ia
Ib
IIa
IIb
IIIa
IIIb
SuwanneeLimestone
Mid
dle
Eoc
ene
- A
von
Par
k F
orm
atio
n
hiatus
hiatus
IVb
IVa
top Oldsmar Fm.
base Suwannee Fm.
~1000 ft (305 m)~1000 ft (305 m)~1000 ft (305 m)
gamma ray (cps) gamma ray (cps) gamma ray (cps) gamma ray (cps)
Very Low
Low
Medium
High
Very High
IW-13 FMS log Resistivity-Permeability ModelDepth (feet) G.R. Cycle
sequence boundary
1950
2000
2050
2100
2150
2200
2250
2300
2350
2400
2450
maximumflooding ?
subunita
subunitb
natural gamma ray
0 cps 100
regressive
transgressive
Gamma-Ray Log Model
Avon Park Fm.
gamma-raylog trend
more dolomite?
slower and/orintermittentdeposition?
finer-grainedlithofacies?
limestone?
relativelyrapid
deposition?
G.R. signature?
hiatal surface
University of Miami
CSL
0.000
500.0
1000
1500
2000
2500406080100120140160180
IW13 Sonic Velocity
Sonic velocity (usec/ft)
Suwannee Ls.
Oldsmar Fm.
HawthornGroup
trans
gres
.re
gres
sive
max.flood
Ia
Ib
IIa
IIb
IIIa
IIIb
Mid
dle
Eoc
ene
- A
von
Par
k F
orm
atio
n
IVb
IVa
1500
1600
1700
1800
1900
2000
2100
2200
23002000 6000 7000
Sunrise IW-3 Eocene Peritidal Facies Velocity
Dep
th i
n co
re (
feet
)
P-wave velocity (m/sec) at 10 MPa confining pressure3000 4000 5000
grainstonepackstonelaminated pkst/wackst"pond" mudstonemassive mudstonedense dolomite
Avon Park Formation
sequence boundary
resistivity, velocity & sonic porosity
gamma ray interpretation FormationMicroScanner
gamma-raylog profiles
andcorrelation,
southernstudy area
2000
2100
2200
2300
2400
00.10.20.30.40.50.6
IW13 Sonic Porosity
sonic porosity
Avon ParkFormation
IW-13FMS log
Depth (feet)
G.R.Cycle
dolomiteunit
1950
2000
2050
2100
2150
2200
2250
2300
2350
2400
2450
2000
2100
2200
2300
2400
0 10 20 30 40 50
IW13 Gamma Ray
gamma ray (cps)
sequence boundry
2000
2100
2200
2300
2400
0 0.5 1 1.5 2 2.5 3
IW13 LL3 Resistivity
resistivity (ohm-m)