Download - KMS Technologies – KJT Enterprises Inc
KMS Technologies – KJT Enterprises Inc.
Strack, K. – M. & Truman II, R.
Advances in Borehole Resistivity Logging
1999
Presentation
Society of Exploration Geophysicists, Annual Meeting, Houston, Invited paper in workshop
“Recent Advances in Logging Methods”
Advances Advances in in
Borehole ResistivityBorehole ResistivityLoggingLogging
K.-M. Strack (KMS Technology)&
R. Truman II (Baker Atlas)
SEG workshop 1999
HDLLHDLL
TCRTCR
HDILHDIL
3D3D-- EMEM
??STARSTAR ?
DLLDLLDPILDPIL MLLMLLTBRTTBRT
ObjectivesObjectives
o Cover vast new logging toolso Software productso MWD/LWDo Imaging tools
Facts:Facts:
• Resistivity logs are commonly used for reserve calculations
• Resistivities are often underestimated (=reserves too low)
• Different logs have – different vertical resolution – different depth of penetration
Oil Oil -- Resistivity relationship: boreholeResistivity relationship: borehole
Rxo Shale R
Oil
Tig ht
Oil
1/2 Oil1/2 Water
Water
t
′′V
V
′V
LWD and LWD and wirelinewireline methods methods definitions:definitions:
•• MWD/LWD MWD/LWD -- measurement/logging measurement/logging while drillingwhile drilling– sensor is part of the drill string;
hostile sensor environment; basic sensors exist; making fast progress, data transmission via mud pulse (few 10 Hz) & memory packages
•• WirelineWireline -- sensor attached to sensor attached to armored long cablearmored long cable– delicate instruments with real time
surface acquisition; formation samplers to high data rate imaging tools (video).
KMS99002e
MWD and MWD and wirelinewireline induction logs induction logs GOMGOM
0.1
1
10
100
60 80 100 120 140 160 180 200 220
Depth (feet)
App
aren
t Res
istiv
ity
RES10
RES20
RES35
RES60
0.1
1
10
100
60 80 100 120 140 160 180 200 220
Depth (feet)
Appa
rent
Res
istiv
ity
A10
A20
A30
A60
A90
MWDMWD WirelineWireline
after Meyer, 1997KMS99002l
Reserves estimatReserves estimatDPIL vs. HDILDPIL vs. HDIL
Net Pay and Saturation Analysis
DPIL HDILReservoir Thickness: 270 ftNet Pay (ft) 103.6 130.1Net Pay 38.4% 48.2%Por. Feet 15.4 ft18.9 ftHyd. Feet 7.4 ft 9.2 ft
HDIL data allowed 24%more OIIP be booked.
HDILHDIL
DPILDPILHDILHDILDPILDPIL
Step change through hardwareStep change through hardware
WALS98209g
Improved verticalResolution
RtRtGamma rayGamma ray
calipercaliper
SPSP
RxoRxo MLLMLL
DLL DLL HDLL HDLL HDLL HDLL vsvs DLLDLL
WALS98209i
HRAI (High Resolution Array Induction)HRAI (High Resolution Array Induction)
• 10 receiver arrays• one transmitter at dual frequencies• symmetric tool• independent vertical deconvolution for each
receiver array• radial focusing for each matched resolution• 1-, 2-, 4-ft and dynamical resolution displays
• 10 receiver arrays• one transmitter at dual frequencies• symmetric tool• independent vertical deconvolution for each
receiver array• radial focusing for each matched resolution• 1-, 2-, 4-ft and dynamical resolution displays
HRI-type 3-receiver coil arrays to achieve deep high resolution logs
independent of shallow measurements
Induction Log Example Induction Log Example -- DJ BasinDJ Basin
Correcting underpredicted reservesCorrecting underpredicted reserves
Dep
th (ft
)4800
4900
4850
4950
Apparent resistivity (Wm)1 10010 1000
WALS965207l-2
Log run 1 01.22.94Log run 2 01.26.94Induction log 02.27.82Casing collars
TCR Colorado testTCR Colorado test
Real data: HDIL VRM curves
(Estimated dip = 75 degrees) Processed as 0 degree Processed after dip correction
101
102
3570
3575
3580
3585
3590
3595
3600
3605
3610
3615
3620
Resistivity (Ohm.m)
Dep
th (m
)
10 Inch VRM 20 Inch VRM 30 Inch VRM 60 Inch VRM 90 Inch VRM 120 Inch VRM
101
102
3570
3575
3580
3585
3590
3595
3600
3605
3610
3615
3620
Resistivity (Ohm.m)
Dep
th (m
)
10 Inch VRM 20 Inch VRM 30 Inch VRM 60 Inch VRM 90 Inch VRM 120 Inch VRM
KMS Technologies – KJT Enterprises Inc. 6420 Richmond Ave., Suite 610
Houston, Texas, 77057, USA Tel: 713.532.8144
Please visit us
http://www.kmstechnologies.com//