Consideration for Logging at
NanTroSEIZE
Prepared for Lamont Logging
Symposium
Important things
• We want to check out the original data
– We do NOT let Schlumberger do QC
• Help from LDEO-BRG is essential
– BRG specialist(s) neds onboard the LWD
expedition.
• Effective cooperation between
CDEX/TAMU/BRG. How?
• Kuroshio may not be a problem for LWD…
LWD expedition discussion
• 53 days for 6 sites: TD yet to be discussed.
• Seismic Vision: checkshot can be done during the pipe
connection. It should be done with LWD if we do not plan
same thing with WL.
• Sonic: Quality for slow formation (Vs)
• Provision: not satisfactory? JOGMEC says good.
• StethoScope:
• EcoVision is a superset of Adn
– CDEX will do eone of these.
• Who pays the cost?
Stage1 Logging plan
LWD
Wireline
Logging
NT1-1
NT1-7
NT1-3
NT3-1
NT2-4**
NT2-1A
Yes
SED section only
Yes
SED section only
Yes
Yes
Yes
Yes
NMR porosity, permeability
estimation, etc
^
^
^
^
^
^
MWD (GR)
^
^
^
^
^
^
CDN (density, neutron
porosity)
^
^
^
^
^
^
ISONIC (P-wave)
?
?
?
?
?
?
Maybe
Likely to be
difficult
Yes
Attempt Whole
Interval
Yes
Only through
BSR interval
Maybe
Likely to be
difficult
-
-
Down to BSR
Down to BSR
-
YES-
Yes
Yes
-
Yes
-
-
?
YES
-
-
LWD (SeismicVision)
Yes
Yes
Yes
Yes
Yes
Yes
Temp, Pore pressure in soft
sed section
Yes
Yes
Yes
Yes
Yes
Yes
-
YES?
Yes
-
-
Yes
Resistivity imaging
FMS
DSI
YES - Basement only at both of these
sites
(If basement is done in Stage 1)
GR
CMR (NMR log)
VSP
Checkshot (vertical)
Offset
Downhole
Measurement
-
PackerExp.
with OBS obs.
Objectives of LWD Expedition
•
•
Systematic logging of common properties throughout all 6 holes from the
reference sites to the forearc basin – reference to the coring expeditions
Detection and identification of fault zone, basement, BSR, etc.
– No casing
– Hole abandon procedure for hydrologic problem
•
Fault architecture characterization
– fracture density, orientation, and conductivity
•
•
•
•
Stress Orientation through borehole breakout
Vp and density of old accretionary prism
Core-Log-Seismic Integration
Lithostratigraphic properties (Logging UNITS)
•
History of landslides
– RAB / Sonic (Mexico gave a good example)
•
Methane Hydrate study
•
•
•
Basalt will NOT be drilled, to preserve hydrological condition
Accurate positioning of hole trajectories
In-situ T&P will be estimated during later expeditions, not this?
Scientific Application for LWD
Objectives / Properties
Site
NMR pore
distribution
Vp,Vs
Checkshot
Porosity/
Density/
Caliper
Resistivity
Image
Fault zone detection
1-3 / 2-1
@
@
@
@
@@
Fault architecture characterization
1-3 / 2-1
Stress Orientation through borehole breakout
ALL
@
@@
CLS Integration
ALL
@
@@
@
Evolution of accretionary complex
ALL
@
@
@
Vp and density of old accretionary prism
3-1 +
@
Lithostratigraphic properties (Logging Units)
ALL
Excess Pore Pressure
ALL
History of landslides
1-3 / 2-1
Hydrate detection / Saturation
3-1 / 2-1
Fluid flow regime in the accretionary prism
ALL
Permeability
ALL
Poisson ratio
ALL
Anisotropy ??
ALL
Diagenesis / Cementation
ALL
@
Compressibility / Shear strength
ALL
@
@
@
@
@
@
@
@
@
@
@
@
@
@@
@
@
@
@
@
@@
LWD Tools and properties
•
•
geoVISION: Five different resistivity measurements and image
(RAB).
adnVISION: Porosity/Densisity/Caliper
–
–
–
–
•
Neutron porosity values strongly fluctuate at high porosity
Gamma-ray density is stable
Density image (16 sectors) is obtained by rotary density sensor
Standoff can be measured by Ultrasonic Caliper - computed
SonicVISION: Vp and Vs (only faster formation)
– Vp quality in slow formation significantly improved from ISONIC
– SeismicVISION do the checkshots simultaneously (will not take time but
costly; hydrophone at bit)
•
ProVISION: Magnetic resonance (MR) measurements
– Total porosity, free-fluid, and bound-fluid volume measurements
– Permeability can be estimated
– No radioactive sources but very expensive
•
Ecoscope:
– Multisensors in one collar (NP, D, US-Caliper, induction resisitivity,
APWD, Az-GR, elemental capture spectroscopy)
– All sensors located at less than 20 ft from the bit
– Low risk: weaker source than ADN
Scenarios for tool selection
• A) geoVISION / adnVISION / SonicVISION / SeismicVision / ProVISION /
Ecoscope
– Best scenario. ADN is not necessary if Ecoscope can be done.
• B) geoVISION / adnVISION / SonicVISION / SeismicVision / ProVISION /
Ecoscope
– Alternate for scenario A).
• C) geoVISION / adnVISION / SonicVISION / SeismicVision / ProVISION /
Ecoscope
– If we cannot afford Provision…..
• Scientific Priority
–
–
–
–
–
0) MWD+APWD
1) adn/Eco? + geoVision (Porosity/Densisity/Caliper + Res. Image)
2) SonicVision and/or (Vp, Vs)
3) SeismicVision (VSP checkshot) – alternate for wireline VSP
4) ProVision (NMR pore distribution)
Homework on LWD
TD Obj.
NT1-1 NT1-7
NT1-3
NT2-1
NT2-3
NT3-1
Top of
Basement
Top of
Basement
Frontal
thrust at
400m, TD to
600m
1000m
1000m
300m below
reflector
6
*
*
*
*
?
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1
*
*
*
*
*
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5
**
*
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2
**
*
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**
4
**
*
*
*
**
?
Casing
Seq.
MWD/APWD
adn/Eco
geoVision
SonicVision
SeismicVision
ProVision
3
**
*
*
*
*
*
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