Post on 01-Aug-2020
1
ACAE -- ESTUDIO PILOTO DE DIAGNÓSTICO DE FÍSICA DE ROCAS DEL YACIMIENTO CABALLOSEN LOS CAMPOS PUERTO COLON - LORO Y HORMIGA AREA SUR PUTUMAYO
PROBLEM: Provide a rational rock-physics basis for determining the lateral heterogeneity and reservoirquality in 3D in Caballos formation.
Seismically discriminate massive blocky sands (e.g., Acae 10), from shaley sands (e.g., Acae 8A).
0 50 100 150
10.5
10.6
GR
Dep
th (kft
)
Acae 10
APPROACH: Rock physics analysis of ~ 30 well logs and 20 core plugs
0 0.1 0.2Porosity
Acae 8A
0 0.1 0.2Porosity
Acae 10
0.1 10 1000Permeability (mD)
Acae 8A
0.1 10 1000Permeability (mD)
Acae 10
0 50 100 150
10.5
10.6
GR
Acae 8A
Dep
th (kft
)
ACAE 10 ACAE 8A
GP170/2001 #12
20 0.05 0.1 0.15 0.2 0.25
3.5
4
4.5
5
5.5
20
40
60
80
100
120
140
160Acae 6Acae 9Hormiga 2ALoro 9DSan-Miguel 6
GR
Porosity
Vp (km
/s)
GP170/2001 #12
1
10
100
1000
0 0.1 0.2 0.3
Unit 1Unit 2Unit 3Unit 4
Per
mea
bilit
y (m
D)
Porosity
Acae 10
50 100 150
10.50
10.55
10.60
10.65
GR
Dep
th (kft
)
AC10Caballos
U1
U2
U3
U4ACAE Case Study.2
Reservoir Quality:Porosity and Permeability
Porosity and Velocity
50 100
10.5
10.6
10.7
GRD
epth
(kft
)
AC8Caballos
10 100 1000
Resistivity
AC8Caballos
2.2 2.4 2.6 2.8
RHOB
AC8Caballos
0 0.1 0.2 0.3
Porosity
AC8Caballos
NPHI
3.5 4 4.5 5.0Vp (km/s)
AC8Caballos
3.5
4.0
4.5
5.0
0 0.1 0.2 0.3
Vp (km
/s)
PhiRHO
Role of Clay (GR)
3
ACAE Case Study.3
POINTS OF REFERENCE: HAN'S DATASET
3
4
5
6
0 0.1 0.2 0.3
C = 0
C = 3-7%
C = 8-11%
C = 18-51%
Vp (km
/s)
Porosity
2
3
4
0 0.1 0.2 0.3
C = 0
C = 3-7%C = 8-11%
C = 18-51%
Vs
(km
/s)
Porosity0 0.1 0.2 0.3 0.4 0.5
0
0.1
0.2
0.3
0.4
Clay Content
Water-Saturated
Poi
sson
's R
atio
4
5
0.1 0.2
Vp (km
/s)
Density-Porosity
Acae 8Caliper < 8.5
HAN C = 0
HAN C = 3-7%
4
5
0.1 0.2
Vp (km
/s)
Density-Porosity
Acae 8ACaliper < 7
HAN C = 0
HAN C = 3-7%
4
5
0.1 0.2
Vp (km
/s)
Density-Porosity
Hormiga 2ACaliper < 6.5
HAN C = 0
HAN C = 3-7%
CROSS PLOTTING with POINTS OF REFERENCE
GP170/2001 #12
4
ACAE Case Study.4 -- Looking at Bigger Picture
4 5Vp (km/s)
Dep
th (kft
)
AC 5
50 100 150
9.5
10.0
10.5
GR
Dep
th (kft
)
AC 5
Dep
th (kft
)
0.1 0.2Porosity
Dep
th (kft
)
AC 5
Acae 5 Highlighted arezones with caliper < 9.5.
4
5
0.1 0.2
Vp (km
/s)
Density-Porosity
Acae_5Depth > 9 kftCaliper < 9.5
4
5
0.1 0.2
Vp (km
/s)
NPHI
Acae_5Depth > 9 kftCaliper < 9.5
50 100 150
9.5
10.0
10.5
GR
Dep
th (kft
)
AC 7
Dep
th (kft
)
4 5Vp (km/s)
Dep
th (kft
)
AC 7
0.1 0.2Porosity
Dep
th (kft
)
AC 7
4
5
0.1 0.2
Vp (km
/s)
NPHI
Acae_7Depth > 9.5 kftCaliper < 9.5
Han CleanHan 3-8% ClayHan >18% Clay
4
5
0.1 0.2
Vp (km
/s)
Density-Porosity
Acae_7Depth > 9.5 kftCaliper < 9.5
Han CleanHan 3-8% ClayHan >18% Clay
Acae 7 Highlighted arezones with caliper < 9.5.
GP170/2001 #12
5
ACAE Case Study.5 -- Looking at Bigger Picture
50 100 150
9.5
10.0
10.5
GR
Dep
th (kft
)
AC 8
Dep
th (kft
)
4 5Vp (km/s)
Dep
th (kft
)
AC 8
0.1 0.2Porosity
Dep
th (kft
)
AC 8
Acae 8 Highlighted arezones with caliper < 9.5.
4
5
0.1 0.2
Vp (km
/s)
Density-Porosity
Acae_8Depth > 9.5 kftCaliper < 9.5
Han CleanHan 3-8% ClayHan >18% Clay
4
5
0.1 0.2
Vp (km
/s)
NPHI
Acae_8Depth > 9.5 kftCaliper < 9.5
Han CleanHan 3-8% ClayHan >18% Clay
50 100 150
10.0
10.5
GR
Dep
th (kft
)
AC 11
Dep
th (kft
)
4 5Vp (km/s)
Dep
th (kft
)
AC 11
0.1 0.2Porosity
Dep
th (kft
)
AC 11
Acae 11 Highlighted are zones withcaliper < 9.5.On the right: Dark-blue symbols are forlog Vp plotted versus core porosity.
4
5
0.1 0.2 0.3
Vp (km
/s)
NPHI
Acae_11Depth > 9.5 kftCaliper < 9.5
Han CleanHan 3-8% ClayHan >18% Clay
4
5
0.1 0.2
Vp (km
/s)
Density-Porosity
Acae_11Depth > 9.5 kftCaliper < 9.5
Han CleanHan 3-8% ClayHan >18% Clay
GP170/2001 #12
6
ACAE Case Study.6
φF = φt + C(1 − φc )
3
4
5
0 0.1 0.2 0.3
Vp (km
/s)
Porosity
DryClay < 35%
0 0.1 0.2 0.3Porosity
No Clay
3% < Clay < 18%
18% < Clay < 37%
0 0.1 0.2 0.3Load-Bearing Frame Porosity
All Samples
0 0.1 0.2 0.3
10.6
10.7
Porosity
Dep
th (kft
)
AC 11
Predicted
Dep
th (kft
)
0 0.1 0.2 0.3
10.5
10.6
Porosity
Dep
th (kft
)
AC 8A
Predicted
Dep
th (kft
)
0 0.1 0.2 0.3
10.6
10.7
10.8
10.9
11.0
11.1
11.2
Porosity
Dep
th (kft
)
HR4
Predicted
Dep
th (kft
)
Predicting Porosity in Wells
VERIFYING LOG DATA BY CORE MEASUREMENTS
0 0.1 0.2 0.3
10.50
10.55
10.60
ECP CoreOur Core
Porosity
Dep
th (kft
)
Acae 10
PhiRHO
3 4 5 6
10.50
10.55
10.60
35 MPa
40 MPa
Vp (km/s)
Dep
th (kft
)
Acae 10
Vp Log
4.5 5
10.45
10.50
10.55
10.60
35 MPa
40 MPa
Vp (km/s)
Dep
th (kft
)
Acae 8AVp Log
GP170/2001 #12
7
ACAE Case Study.7Comment on Log Data Quality
3.5
4.0
4.5
5.0
25 50 75 100
Vp (km
/s)
GR
AC6Caballos
3.5
4.0
4.5
5.0
0 0.1 0.2 0.3
U1U2U3U4
Vp (km
/s)
PhiRHO
Han Clean
Han 3-7% Clay
Understanding rock physics helpsin dealing with older data sets
50 100 150
10.50
10.55
10.60
10.65
10.70
GR
Dep
th (kft
)
AC9Caballos
U1
U2
U3
U4
1001000 104
Resistivity
AC9Caballos
2.4 2.6
RHOB
AC9Caballos
0 0.1 0.2 0.3
Porosity
AC9Caballos
NPHI
4 5
Vp (km/s)
AC9Caballos
3.5
4.0
4.5
5.0
0 0.1 0.2 0.3
U1U2U3U4
Vp (km
/s)
PhiRHO
Han Clean
Han 3-7% Clay
AC9Caballos
GP170/2001 #12
88 10 12 14 16 18 20
0.15
0.2
0.25
0.3
0.35
Acoustic Impedance
Po
isso
n's
Ra
tio
ACAE 8A and 10 PLUGS
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3Log(Permeability)
GOOD QUALITY
POOR QUALITY
GLAUCONITES
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.28
9
10
11
12
13
14
15
16
17
Porosity
Aco
ustic
Impe
danc
e
ACAE 8A and 10 PLUGS
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
OIL-SATURATED PLUGS
Log(Permeability)
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18-2
-1
0
1
2
3
4
Porosity
Log(
Per
mea
bilit
y)
ACAE 8A and 10 PLUGS
0.16
0.18
0.2
0.22
0.24
0.26
OIL-SATURATED ROCK
Poisson's Ratio
ACAE Case Study.8How to Predict Porosity from Seismic -- By Integrating Core Data
The petrophysical “signal” for AVO lithology analysis is the lithology dependence ofVp/Vs. Inspection of Vp versus Vs trend curves for sandstones, shales, limestones,and dolomites, reveals that lithology discrimination is most robust at highervelocities where sandstones have low Vp/Vs (1.5 - 1.6) and the other lithologieshave higher Vp/Vs (1. 7- 2.0).
Castagna and Backus, 1993
GP170/2001 #12
90 5 10 15 20 25
1.64
1.66
1.68
1.7
1.72
1.74
1.76
1.78
1.8
1.82
time
distance0 5 10 15
1.64
1.66
1.68
1.7
1.72
1.74
1.76
1.78
1.8
1.82
time
distance
Acae 10 Original Acae 10 + 25% Clay
30 Hz
dept
h
0 5 10 15
1.64
1.66
1.68
1.7
1.72
1.74
1.76
1.78
1.8
1.82
time
distance
dept
h
0 5 10 15
1.64
1.66
1.68
1.7
1.72
1.74
1.76
1.78
1.8
time
distance0 100 200
2900
3000
3100
3200
GR
Dep
th (m
)
0 100 200
2900
3000
3100
3200
GR
Dep
th (m
)
5 10 15Ip
5 10 15Ip
Acae 10 Acae Pseudo-8A
ACAE Case Study.9Knowing Model Helps Forward-Model Seismic Response
GP170/2001 #12