IWANOHARA Time Lapse Well Logging - RITE · PDF file1 International Workshop on CO2Geological...
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Transcript of IWANOHARA Time Lapse Well Logging - RITE · PDF file1 International Workshop on CO2Geological...
1
International Workshop on CO2 Geological Storage , Japan ‘06
IWANOHARA
Time Lapse Well Logging
Geophysical Surveying CO.,LTD.
21 February 2006
Jiro Watanabe
Geophysical Surveying CO., LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06Geophysical Surveying CO.,LTD.
Induction Log (Resistivity)
Neutron Log (Porosity)
Acoustic Log (Acoustic Velocity)
Observation wells with monitoring logs
Purpose of Time lapse well logging
2. Estimation of CO2 saturation.
1. Detection of carbon dioxide (CO2) breakthrough at
the observation wells.
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International Workshop on CO2 Geological Storage , Japan ‘06
Wireline logging unit at Iwanohara field
OB-2
OB-4OB-3
IW-1
Liquified CO2 Vessel
Logging Unit
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
3D configuration of the wells
CO2
Up Dip
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
Time lapse logging schedule
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
Results of time lapse logging (OB-2)
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
Mar. 10. 2004
CO2 Breakthrough (OB-2)
Geophysical Surveying CO.,LTD.
Feb. 12. 2004
Vp : 2.55 → 1.84 km/sec
0.71km/sec, 28% ▼
R : 5.02 → 5.56 Ω・m
0.54Ω・m, 11%△
φn : 0.24 → 0.14
0.10, 42%▼
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International Workshop on CO2 Geological Storage , Japan ‘06
Change of ΔVp (OB-2)
Acoustic Log
0.4
0.0 (km/sec)
-0.2
-0.4
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
Change of Δφn (OB-2)
Neutron Log
0.2
0.0 (frac)
-0.1
-0.2
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
Change of ΔR (OB-2)
Induction Medium Log
1.6
0.0 (Ω・m)
-0.8
0.8
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
Rate of changes (OB-2)
+0.4
0
-0.4
Vp
φn
R
CO2
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
Assumptions :
Estimation of CO2 saturation
◆ No gas and oil in the aquifer before CO2 breakthrough.
◆ The time lapse neutron log is equivalent the open hole
porosity log.
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06Geophysical Surveying CO.,LTD.
Time lapse neutron log calibration
NMR log Vs Time lapse neutron log
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International Workshop on CO2 Geological Storage , Japan ‘06
Porosity Log (OB-2)
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
Change of Porosity (OB-2)
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
CO2 Saturation Map (OB-2)
Geophysical Surveying CO.,LTD.
0.0
0.6
0.3
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International Workshop on CO2 Geological Storage , Japan ‘06
Vp Response (OB-2, @1,116m)
Geophysical Surveying CO.,LTD.
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International Workshop on CO2 Geological Storage , Japan ‘06
Resistivity
Neutron
Geophysical Surveying CO.,LTD.
Conclusions 1
◆ The resistivity log is good in reproducibility.
◆ CO2 saturation from resistivity is smaller than CO2 saturation
from neutron log . It is difficult to estimate correct CO2 saturation from resistivity on present form. The phase behavior of CO2 inthe reservoir is still unknown.
◆ The hydrogen index measurement is easiest and certain way to
estimate CO2 saturation.
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International Workshop on CO2 Geological Storage , Japan ‘06Geophysical Surveying CO.,LTD.
◆ CO2 saturation can be presumed from change of Vp.
Conclusions 2
Acoustic
◆ The relation between Vp and CO2 saturation from neutron logagree with Gassmann theory.
◆ A small amount of CO2 causes a large drop in Vp.
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International Workshop on CO2 Geological Storage , Japan ‘06Geophysical Surveying CO.,LTD.
Jan. 13. 2006