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KMS Technologies – KJT Enterprises Inc.
Strack, K. – M.
Resistivity Logging Past, present & future
2004
Presentation
Society of Physics Students, Technical Meeting, Dhahran, Saudi Arabia
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity LoggingResistivity Logging
Past, present & futurePast, present & future
K. StrackKMS Technologies – KJT Enterprises Inc.
June 2004
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity logging: Past, Present & FutureResistivity logging: Past, Present & Future
• Introduction• Past
HistoryOlder toolsPitfalls
• PresentOverall conceptImproved toolsInnovative toolsInterpretation
• Future
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity logging: Past, Present & FutureResistivity logging: Past, Present & Future
• Introduction• Past
HistoryOlder toolsPitfalls
• PresentOverall conceptImproved toolsInnovative toolsInterpretation
• Future
© Copyright KJT Enterprises Inc. 2001-2004
ObjectiveObjective
• Provide a resistivity logging snapshot • Stay with wireline only (MWD later)• Link past & future developments
© Copyright KJT Enterprises Inc. 2001-2004
Oil Oil -- Resistivity relationshipResistivity relationship
Rxo Shale R
Oil
Tight
Oil
1/2 Oil1/2 Water
Water
t
V
′V
′′V
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity logging: Past, Present & FutureResistivity logging: Past, Present & Future
• Introduction• Past
HistoryOlder toolsPitfalls
• PresentOverall conceptImproved toolsInnovative toolsInterpretation
• Future
© Copyright KJT Enterprises Inc. 2001-2004
The fun of ancient loggingThe fun of ancient logging
After SPWLA, 1979
© Copyright KJT Enterprises Inc. 2001-2004
The PhasesThe Phases
• 1921 - 1927 Conceptual Phase• 1927 – 1949 Acceptance Phase• 1949 – 1985 Maturity Phase• Since 1985 – Reinvention Phase
• Historically:Schlumberger dominated (exceptions: MPI, EMI)During 1990 Baker caught up and developed new
tools (3DEX and TCR)
After Luthi 2001
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity logging: Past, Present & FutureResistivity logging: Past, Present & Future
• Introduction• Past
HistoryOlder toolsPitfalls
• PresentOverall conceptImproved toolsInnovative toolsInterpretation
• Future
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity tools underlying principleResistivity tools underlying principle
(after van Ditzhuijzen, 1994)
© Copyright KJT Enterprises Inc. 2001-2004
Electric resistivity devicesElectric resistivity devices
• Normal log• Lateral log• LL3• LL7, DLL• LL8 – as LL7 but shorter spacing & return• Rxo logs• Diplogs
© Copyright KJT Enterprises Inc. 2001-2004
V
V
Cable armor
Lateral
Normal
JT Enterprises Inc. 2000After Labo 1987
Normal and lateral principleNormal and lateral principle
© Copyright KJT Enterprises Inc. 2001-2004
Normal & Normal & lateral logs: lateral logs: curvescurves
After Labo 1987
© Copyright KJT Enterprises Inc. 2001-2004
LL7, DLLLL7, DLLLL3 and LL7LL3 and LL7
LL3LL3
© Copyright KJT Enterprises Inc. 2001-2004
MicroMicro--SFL principleSFL principle
After Peeters, 1995, Schlumberger
Rxo= (VMo – VM1) / Io
© Copyright KJT Enterprises Inc. 2001-2004
MicrologMicrolog picturepicture
After SPWLA, 1979
© Copyright KJT Enterprises Inc. 2001-2004
DipmeterDipmeter tool principletool principle
.After Luthi, 2001
Different environments•Water based mud• Oil based mud
© Copyright KJT Enterprises Inc. 2001-2004After Luthi, 2001
DiplogDiplog principleprinciple
• used in water based mud
© Copyright KJT Enterprises Inc. 2001-2004
After Luthi, 2001
OBM dip tool OBM dip tool principleprinciple
• used in oil based mud
© Copyright KJT Enterprises Inc. 2001-2004
SLBSLB’’ss dip log tool: SHDTdip log tool: SHDT
After Luthi, 2001
© Copyright KJT Enterprises Inc. 2001-2004
After Luthi, 2001
SHDTSHDT™™ diplogdiplogexampleexample
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity logging: Past, Present & FutureResistivity logging: Past, Present & Future
• Introduction• Past
HistoryOlder toolsPitfalls
• PresentOverall conceptImproved toolsInnovative toolsInterpretation
• Future
© Copyright KJT Enterprises Inc. 2001-2004
BHD
= 8 inRm
= 0.15 Wm
96102
10 100 1000
Depth of Invasion
500
bhdbhd = 8 in.= 8 in.RmRm = 0.15 W m= 0.15 W m
Apparent Resistivities (Ωm)
25
98100
104106
108110
112114
116
1
Depth (in.)
RtRxo
LLD
LLSLi
Pitfalls: Pitfalls: LaterologLaterolog --invaded layersinvaded layers
After Mezzatesta, 1996
© Copyright KJT Enterprises Inc. 2001-2004
from The Log Analyst, 1994
invasion radiusinvasion radius
100 0.2 200
est. riest. ri
est. Rtest. Rt
est. Rxoest. Rxo
true Rxotrue Rxo
true Rttrue Rt
DLLDLL
DILDIL
0 in. ohm-m
riri
100
150
200
ft
22--D D InversionInversionResultsResults
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
Pitfalls: Induction logsPitfalls: Induction logs
After Anderson, 1986
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity logging: Past, Present & FutureResistivity logging: Past, Present & Future
• Introduction• Past
HistoryOlder toolsPitfalls
• PresentOverall concept
Direct image of geologyMore dataNew measurementsBetter understanding of measurements & geology
Improved toolsInnovative toolsInterpretation
• Future
© Copyright KJT Enterprises Inc. 2001-2004
Combined photo & imageCombined photo & image
image
photograph
© Copyright KJT Enterprises Inc. 2001-2004
HDLL
V ′′
Data Inversion RtApparent Rt
LimitsLimits PossibilitiesPossibilities
DLLGalvanic
After Strack, 1999
From meters to acquisition systemsFrom meters to acquisition systems
V’
V
© Copyright KJT Enterprises Inc. 2001-2004
Raw Array → Data Inversion → RtRaw Array → Data Inversion → RtApparent RtApparent Rt
DPIL
HDIL
From meters to acquisition systemsFrom meters to acquisition systems
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity logging: Past, Present & FutureResistivity logging: Past, Present & Future
• Introduction• Past
HistoryOlder toolsPitfalls
• PresentOverall conceptImproved tools
Image tools (WBM & OBM)Array tools (Induction & Laterologs)
Innovative toolsInterpretation
• Future
© Copyright KJT Enterprises Inc. 2001-2004
From From diplogdiplog to imagingto imaging
• Imaging started with dip logs• Today multi button imagers replace most dip
logs• Image tool are used for geologic
interpretation• Could be used also for reserve estimates
© Copyright KJT Enterprises Inc. 2001-2004
0 360180
DipAzim
Azimuth
Courtesy of Paauwe, 2001
How the display is derivedHow the display is derived
© Copyright KJT Enterprises Inc. 2001-2004
ExampleExample
After Rider, 1996
© Copyright KJT Enterprises Inc. 2001-2004
Current electrical imagersCurrent electrical imagersPad with25 buttons
Alternate pads offset from each other
Powered standoff centralizes tool
CBIL is attached to lower end of tool string
6 alternately offset electrical imaging pads
FMI
STAR
EMI
Courtesy of Paauwe, 2001
© Copyright KJT Enterprises Inc. 2001-2004
RESISTIVITY IMAGE COVERAGERESISTIVITY IMAGE COVERAGE
8.5” hole: 20% 40% 80% 60%12.25” hole: 14% 28% 56% 42%
FMI EMI/STAR
1987 1989 1991 1994+
2-FMS 4-FMS
4 ARM 4 PAD 4 FLAP4 ARM 4 PAD6 ARM 6 PAD
Courtesy of Paauwe, 2001
© Copyright KJT Enterprises Inc. 2001-2004
Oil based mud (OBM) imagerOil based mud (OBM) imager
• Difficult to get current via OBM• Resolution must be on formation scale• Resistivity range must be large• Imager must have higher lateral/vertical res.• OBMI™ introduced 2001• Cheung et al., 2001 paper
OBMI trademark of Schlumberger
© Copyright KJT Enterprises Inc. 2001-2004(Schlumberger OBMI,2002)
OBMIOBMI™™ functional diagramfunctional diagram
© Copyright KJT Enterprises Inc. 2001-2004
OBMIOBMI™™ versus core imageversus core image
After Cheung et al., 2001
© Copyright KJT Enterprises Inc. 2001-2004
Array Array industionindustion requirementsrequirements
• Multiple depths of investigation• Multiple vertical resolution (improved!)• Increased depth of investigation• More reliable measurements• Streamlined interpretation
© Copyright KJT Enterprises Inc. 2001-2004
Resolution matched exampleResolution matched example
After Beard et al., 1996
© Copyright KJT Enterprises Inc. 2001-2004
HDIL Resolution Matched
After Dip Correction
Array Induction: Dip Effect & CorrectionArray Induction: Dip Effect & Correction
After Beard and Evans, 1996
© Copyright KJT Enterprises Inc. 2001-2004Net Pay and Saturation Analysis
DPIL HDIL
Reservoir Thickness: 270 ft
Net Pay (ft) 103.6 130.1
Net Pay 38.4% 48.2%
Por . Feet 15.4 ft 18.9 ft
Hyd. Feet 7.4 ft 9.2 ft
HDIL data allowed 24%
more OIIP be booked.
HDILHDIL
DPILDPILHDILHDILDPILDPIL
Step change through hardwareStep change through hardware
Reserves estimate Reserves estimate DPIL vs. HDILDPIL vs. HDIL
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
OIIP = (A*h)*Por*(1-Sw)
A= 160 acreAssume 7,758 API Bbl/acre-foot1 Bbl = $22
2 ft VRM Curves 2D Inversion
h 67.00 ft 74.75 ftPor 25.8% 25.9%(1-Sw) 69.5% 67.3%
OIIP 14,912,427 Bbl 16,173,193 BblValue 328 M$ 356 M$
HDIL VRMHDIL VRM
2D inversion2D inversion
volumetricsvolumetrics
porositiesporosities
SwSw
2 ft VRM 2 ft VRM vsvs 2D inversion2D inversion
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
Array Array laterologlaterolog objectivesobjectives
• Next generation lateral instrument
• Resolvethin beds (< laterolog- 2ft)deep invaded formations
• Provide accurate radial profile of Rt & Rxo invasion & flushed zone
evaluation
• Provide risk analysis input error bounds, parameter
importance
© Copyright KJT Enterprises Inc. 2001-2004
Improved verticalResolution
RtRtGamma rayGamma ray
calipercaliper
SPSP
RxoRxo
MLLMLL
DLL DLL HDLL HDLL
After Itskovich et al., 1998
HDLL versus DLLHDLL versus DLL
© Copyright KJT Enterprises Inc. 2001-2004
HRLA Principle and ModesHRLA Principle and Modes
Mode 1 Mode 2 Mode 3 Mode 4 Mode 5
24 ft
Courtesy of Barber, Schlumberger, 2001
© Copyright KJT Enterprises Inc. 2001-2004
Field LogsField Logs
• Main pay zone• Gas sand• Channel sand
environment• 8.5-in. bit• Rm = .08 Ohm-m
Courtesy of Barber, Schlumberger, 2001
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity logging: Past, Present & FutureResistivity logging: Past, Present & Future
• Introduction• Past
HistoryOlder toolsPitfalls
• PresentOverall conceptImproved toolsInnovative tools
Azimutal image3D inductionThrough Casing Resistivity
Interpretation• Future
© Copyright KJT Enterprises Inc. 2001-2004
After Luthi, 2001
Azimuthal Azimuthal resistivity resistivity imager (ARIimager (ARI™™))
© Copyright KJT Enterprises Inc. 2001-2004
After Luthi, 2001
ARIARI™™ exampleexample
© Copyright KJT Enterprises Inc. 2001-2004
ARIARI™™ detailed detailed exampleexample
After Luthi, 2001
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity toolsResistivity tools
• Laterologs• Induction logs• Thin bed tools• Azimuthal resistivity imager• Relationship to image tools• Through casing resistivity• 3D induction• Inversion of resistivity logs
© Copyright KJT Enterprises Inc. 2001-2004
TCRLTCRL™™: Benefits: Benefits
• Bypassed hydrocarbons
• Monitor reservoir changes with time
water/gas flood control
• Better reservoir estimates
larger depth of investigation
optimized vertical resolution
Strack, 1999
© Copyright KJT Enterprises Inc. 2001-2004
Basic historyBasic history
• Three electrode scheme - Alpin (1939)
• Modern design - Kaufman (1990)Vail (1991)
• WA feasibility study - May-Nov. 1993
• Colorado test - Dec. 1993-Mar. 1994
• PML acquisition by BA - Q4 1997
• First digital log, BA Texas - 5/98
• SLB commercial service - 1999
• BHI cancel project - 2000
Strack, 1999
© Copyright KJT Enterprises Inc. 2001-2004
Casing
Injected current
Current leaking intothe current tube
I ( Z + d Z )Z + d Z
Ir 4
Leakage
Main current flowI ( Z )
V
Z
O
O
TCRL principle of operationTCRL principle of operation
Strack, 1999
© Copyright KJT Enterprises Inc. 2001-2004
C
A
J
ED
F
C
A
J
ED
F
C
A
J
ED
F
G B GG BBToolToolTool
Reference Calibration Measurement
V0
V2
V1∆V
~
∆VV1
V2
~~
Operational modesOperational modes
Strack, 1999
© Copyright KJT Enterprises Inc. 2001-2004
TCR tools at Baker Atlas test wellTCR tools at Baker Atlas test well
Strack, 1999
© Copyright KJT Enterprises Inc. 2001-2004(Aulia et al., 2001)
SLB: measurement & calibrationSLB: measurement & calibration
© Copyright KJT Enterprises Inc. 2001-2004
-30
-20
-10
0.5 0.6 0.9 1.00.80.7Apparent Resistivity / Formation Resistivity
Rel
ativ
e de
pth
(m)
to top
1 0Ω m
ρ2
Cas
ing
Casing shoe & reservoir depletionCasing shoe & reservoir depletion
Brin
e sa
tura
ted
(1 Ω
m)
Mix
ed sa
tura
tion
(1 0Ω
m)
Oil
satu
rate
d (1
00 Ω
m)
Strack, 1999
© Copyright KJT Enterprises Inc. 2001-2004
Rel
. Pos
ition
(m)
-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6
-0.5
0.5
0
1
Leakage: (Measured-undistorted) / undistorted
Si /Sc = 1/41/81/161/321/100000
Si
Sc
220
222
224
2260.005 0.01 0.015 0.02
Leakage Current (A)
Collar
MeasuredCalculated
Test wellFeasibility Study
Dep
th (f
t) ∗
∗∗∗
∗∗
∗∗∗ ∗∗
Casing collar effect (resistive)Casing collar effect (resistive)
Link to original field plot Link to original field plot Strack, 1999
© Copyright KJT Enterprises Inc. 2001-2004
Dep
th (f
t)
4800
4900
4850
4950
Apparent resistivity (Ωm)1 10010 1000
Log run 1 01.22.94Log run 2 01.26.94Induction log 02.27.82Casing collars
Colorado test: Blind test zoneColorado test: Blind test zone
Strack, 1999
© Copyright KJT Enterprises Inc. 2001-2004
GRGAPI0 100
CXYIN6 16
CALIIN6 16
CCL0 2500
x050
x100
DEP
THFEET
Deep Induction
OHMM2 200
CHFRTCR_L
TCR_LOHMM2 200
CHFR
TEMPDEGF100 200
7” OD casing~20-year old23 lb./ft.
After Qiang et al., SPWLA 2002
TCRTCR™™ versus CHFRversus CHFR™™
© Copyright KJT Enterprises Inc. 2001-2004
Summary: TCRSummary: TCR™™
• TCR works: Schlumberger have working tools
• Numerical modeling predicted results
• It took 60 years from idea to tool
• Better commercial tools are still needed
After Strack 1998
© Copyright KJT Enterprises Inc. 2001-2004
Transverse Induction Transverse Induction -- historyhistory
• Problem long known (Gianzero, Anderson, Klein & Allen etc)
• Commercial values recognized by Shell (1991)20 – 30% missed reserves
• Project concept developed Shell/WALS 1992/93• Shell funded development by Baker Atlas• Shell patents: Beard et al., 1998 – WO 98/00733; Strack
et al., 2000 - # 6147496• First TILT tool runs GOM, Oman 1999, name
changed to 3DEX™• SLB’s equivalent tool 2003
© Copyright KJT Enterprises Inc. 2001-2004
Crossbeds & sand/shale & siltstonesCrossbeds & sand/shale & siltstones
After Strack & Kriegshaeuser, 1999
© Copyright KJT Enterprises Inc. 2001-2004
x545
x580
x600
x630
30 80 0.2 200
Gamma ray Laterologs
Productiontest
1750 BOPDGOR 3250
Cleansand
Core
Thin beds
Resistivity: exampleResistivity: example
After Strack & Kriegshaeuser, 1999
© Copyright KJT Enterprises Inc. 2001-2004
Turbidite exampleTurbidite example
After Blackbourn & Thomson, 2000
© Copyright KJT Enterprises Inc. 2001-2004
Transverse Induction logging principleTransverse Induction logging principle
Sand: high RSand: high Rtt
Shale: low Rt
Rh
Rv
Additional applicationsAdditional applications
Fracture Fracture detetiondetetionHorizontal well Horizontal well interpreationinterpreationGeoGeo--steeringsteering
After Kriegshaeuser et al, 2000
© Copyright KJT Enterprises Inc. 2001-2004
100% 50% 0%Net / gross
Sand resistivity
Shale resistivity
10 Ωm
1 Ωm
Resist
ivity
Vertical resistivity
Horizontal resistivityHorizontal resistivityHorizontal resistivity
AnisotropyAnisotropyAnisotropy
Resistivities in laminar Sand/Shale sequencesResistivities in laminar Sand/Shale sequences
After Kriegshaeuser et al, 2000
© Copyright KJT Enterprises Inc. 2001-2004
Anisotropy influence on resistivityAnisotropy influence on resistivity
After Yu et al., 2001
© Copyright KJT Enterprises Inc. 2001-2004
Anisotropic vs. Isotropic data matchAnisotropic vs. Isotropic data match
Magnetic Field (mA/m) Magnetic Field (mA/m) Magnetic Field (mA/m)-2 0 2
x380
x400
x420
x440
x460
x480
x500
x520
x540
Hxx - component
Dep
th (f
t)
-2 0 2
x380
x400
x420
x440
x460
x480
x500
x520
x540
Hyy - component
0 2 4
x380
x400
x420
x440
x460
x480
x500
x520
x540
Hzz - component
measuredanisotropicisotropic
After Kriegshaeuser et al, 2000
© Copyright KJT Enterprises Inc. 2001-2004
3DEX3DEX™™: Inversion results: Inversion results
After Yu et al., 2001
© Copyright KJT Enterprises Inc. 2001-2004
3DEX3DEX™™ example dataexample data After Yu et al., 2001
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity logging: Past, Present & FutureResistivity logging: Past, Present & Future
• Introduction• Past
HistoryOlder toolsPitfalls
• PresentOverall conceptImproved toolsInnovative toolsInterpretation
Modeling & inversion• Future
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity toolsResistivity tools
• Laterologs• Induction logs• Thin bed tools• Relationship to image tools• Through casing resistivity• 3D induction, example• Inversion of resistivity logs
© Copyright KJT Enterprises Inc. 2001-2004
•• Inversion methodologyInversion methodology
• Practical implementation
• Case histories
• Conclusions
Inversion OutlineInversion Outline
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
RRt, nt, n RRxo, nxo, n LLxo, nxo, n RRt, nt, n
Earth ModelsEarth Models
After Strack et al., 1998
RRt, n+1t, n+1 RRt, n+1t, n+1RRxo, n+1xo, n+1 LLxo, n+1xo, n+1
RRt, nt, n--11 RRxo, nxo, n--11 RRt, nt, n--11LLxo, nxo, n--11RRmm
BHDBHD
boreholeborehole
⇐ 1 – dimensional (D) model ⇒⇐1
–dimen
sion
al (D) mod
el (ve
rtical) ⇒
⇐ 2 – dimensional (D) (cylindrical) ⇒
⇐ 3 – dimensional (D) model (dip)⇒
© Copyright KJT Enterprises Inc. 2001-2004
Geological formation
Logs
Earth model describedby parameters(resistivity distribution)
Measurements
WESTERNATLAS
Logging processLogging process
Strack, 1999
© Copyright KJT Enterprises Inc. 2001-2004
Geological formation
Logs
Earth model describedby parameters(resistivity distribution)
Modeling
?Inversion
Modeling process for logsModeling process for logs
Geological formationGeological formation
Strack, 1999
datadataModeledModeledloglog
© Copyright KJT Enterprises Inc. 2001-2004
300X
320X
340X
360
DLL
Rxo
Rt
2-D2-D
Rxo
DLL
RIPM
Rt
X300
X320
X340
X360
DLLDLL
DLLDLL
RxoRxo
RxoRxo
RtRt
RtRtLxoLxo
LxoLxo DPILDPILDPILDPIL
1-D1-D
Inversion: 1D versus 2DInversion: 1D versus 2D
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
Rxo
Lxo
MLL
Deep
Shallow
Rt
2 m (6.5 ft)
DLL DLL underestimating underestimating oil reservesoil reserves
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
Sw Diff. Lithology 2-D Fluid Vol.
2-D Lxo
Chart Fluid Vol.
Reservoir Analysis Chart 2-D
Hydrocarbon Meters 5.4 6.0Avg. Sw 25% 21%
Increased OIP Estimates 10%
Reservoir Analysis Chart 2-D
Hydrocarbon Meters 5.4 6.0Avg. Sw 25% 21%
Increased OIP Estimates 10%
22--D Inversion D Inversion versus chart versus chart interpretationinterpretation
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
Inversion Conclusions:Inversion Conclusions:
• Better delineated oil bearing zones
• More accurate formation parameters
• Risk analysis parameters
• New ways for data integration & upscaling
• Frontier: horizontal well interpretation
• Future: Imaging
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
Resistivity logging: Past, Present & FutureResistivity logging: Past, Present & Future
• Introduction• Past
HistoryOlder toolsPitfalls
• PresentOverall conceptImproved toolsInnovative toolsInterpretation
• Future
© Copyright KJT Enterprises Inc. 2001-2004
PastPast PresentPresent FutureFutureField LogsField Logs
InterpretationInterpretation
IntegrationIntegration
EvaluationEvaluation
LogsLogs
ProcessingProcessing
ImagingImagingModelingModeling
InterpretationInterpretation
ModelingModelingField LogField Log
ImagingImagingModelingModeling
InterpretationInterpretation
Field LogsField Logs
EvaluationEvaluationEvaluationEvaluation
The paradigm shiftThe paradigm shift
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
Optimum use: MWD & WirelineOptimum use: MWD & Wireline
• Ability to enhance both LWD & Wireline resistivity data
• More resistive zones translate into more OIP
Joint inversion of MPR & HDIL dataJoint inversion of MPR & HDIL data
JointMPRHDIL
After Strack et al., 1998
© Copyright KJT Enterprises Inc. 2001-2004
STAR resistivity
STAR resistivity
MLL resistivityMLL resistivity
button K from 3Dmodeling
button K from 3Dbutton K from 3Dmodelingmodeling
IntegratedImager &Microlaterolog
IntegratedIntegratedImager &Imager &MicrolaterologMicrolaterolog
© Copyright KJT Enterprises Inc. 2001-2004
Optimum toolOptimum tool
V”∆V
VV1
VV2
Measure
• galvanic & inductive
• horizontal & vertical
© Copyright KJT Enterprises Inc. 2001-2004
General formation evaluation trendGeneral formation evaluation trend
• Optimum use of MWD & wirelineMWD: routine and steeringwireline: imaging and deep (1-10 years then MWD)
• Advanced logs: mineralogy, downhole analysis..• Downhole laboratories & factories• Integrated optimized solutions
tie with SWD to seismic cube
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Houston, Texas, 77057, USA Tel: 713.532.8144
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