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NMR T2 Relaxation for Fluid Saturation and Wettability Determination
G. ERSLAND
IRTG, Oct. 16th, 2012
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Capillary Pressure
Oil Pressure
Water Pressure
Oil Flow
Water Flow
Counter-Current Imbibition – Fractured Reservoirs
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Wettability Determination
• Standard methods for wettability determination
– Amott Test– USBM– Contact Angle
NMR
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5
4) Wettability
Sandgrain
water
oil
solidwater
oil
= 0
Water wet
Vannoil
solid
water
= 90o
Neutrally wet
solid
water oil
180o
180o
oil wet
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M0
Mxy
Time
Mxy = M0*exp(-t/T2)
Sig
nal I
nten
sity
T2 Relaxation Time
Water
Oil
NMR Homogeneous Magnetic Field
N S
B0
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Capillary Pressure
Oil Pressure
Water Pressure
Oil Flow
Water Flow
Counter-Current Imbibition – Fractured Reservoirs
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Pore occupation – T2 mapping
M0
Time
Mxy = M0*exp(-t/T2)S
ign
al In
ten
sity
Relaxation time, T2
Water
Oil
N S
B0
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Oleg V. Petrov , Geir Ersland , Bruce J. Balcom, Journal of Magnetic Resonance Volume 209, Issue 1 2011 39 – 46,
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Pore Occupation – T2 mapping of counter-current water imbibition in strongly water-wet chalk
Shrink Sleeve
POM
Chalk with oil and 30 % initial water
Brine
N S
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Core lengthT2 (ms)
Water
Oil
Water Imbibition from top – strongly water wet chalk