Abstract：
:We propose a new method to determine wettability indices from NMR relaxometry. The new method uses the sensitivity of low field NMR relaxometry to the fluid distribution in oil-water saturated porous media. The model is based on the existence of a surface relaxivity for both oil and water, allowing the determination of the amount of surface wetted either by oil or by water. The proposed NMR wettability index requires the measurement of relaxation time distribution at four different saturation states. At the irreducible water saturation, we determine the dominant relaxation time of oil in the presence of a small amount of water, and at the oil residual saturation, we determine the dominant relaxation time of water in the presence of a small amount of oil. At 100% water and 100% oil saturation, we determine the surface relaxivity ratio. The interaction of oil with the surface is also evidenced by the comparison of the spin-lattice (T1) and spin-locking (T1rho) relaxation times. The new NMR index agrees with standard wettability measurements based on drainage-imbibition capillary pressure curves (USBM test) in the range [-0.3-1].
journal_name
Magn Reson Imagingjournal_title
Magnetic resonance imagingauthors
Fleury M,Deflandre Fdoi
10.1016/s0730-725x(03)00145-0subject
Has Abstractpub_date
2003-04-01 00:00:00pages
385-7issue
3-4eissn
0730-725Xissn
1873-5894pii
S0730725X03001450journal_volume
21pub_type
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journal_title：Magnetic resonance imaging
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