Patent ID: 8362767

Claim:
A method for determining reservoir wettability, the method comprising: using a nuclear magnetic resonance (NMR) device to obtain at least two NMR measurements, the at least two NMR measurements including: a first relaxation measurement and a first diffusion measurement of a first sample from a reservoir formation, and a second relaxation measurement and a second diffusion measurement of a second sample from the reservoir formation, wherein the at least two samples are within an approximate common characteristic region in the reservoir formation; determining a first saturation of a first fluid and a second fluid within the first sample based upon the first relaxation measurement; determining a second saturation of the first fluid and the second fluid within the second sample based upon the second relaxation measurement, wherein the first saturation is different from the second saturation; comparing the first diffusion measurement at the first saturation to the second diffusion measurement at the second saturation to determine at least one wettability property in the reservoir formation.