... Where τ is the natural relaxation time, s ; ω is the mean distance between adjacent layer oil molecules, nm . It should be noted that ω in Eq. (1) is 0.5 nm . n is carbon number of oil molecules; θ is the contact angle, °; σ l is the vacuum oil surface tension, mN / m ; T represents...

... to differentiate oil zones (10+ Ohmm) and water zones (9- Ohmm) from resistivity data. The light oil, however, shows a much slower NMR T 2 relaxation time than the water. Based on the identification of oil versus water by NMR in the pilot hole, three horizontal wells were successfully drilled in the oil zone...

... ; Mjos, 2018 ]]. Currently, however, there are no methods can measure the wettability of reservoir rocks under different saturation states. The surface relaxation times of NMR, T 1,surface and T 2,surface , are well known to be sensitive to the wettability of pore surface because they are mainly...

... on both diffusivity and relaxation time (longitudinal relaxation time T 1 or transversal relaxation time T 2 ) allow differentiation of gas, oil and water. Even though high gas diffusivity creates contrast on transversal relaxation time T 2 to differ gas from the other fluids, the approach based...

... that in tight gas sands, the lab NMR T2 spectra in the Xujiahe tight gas sands of Sichuan basin are dominant as unimodal distribution; the T2 relaxation time of the main peak is lower than 100.0 ms. The Bound fluid volume (BFV) ranges from 35.0% to 60.0%, and the average value is 44.3%, and the NMR T2...

... neutron and density porosity logs, NMR signal amplitude provides detailed porosity free from lithology effects and radioactive sources and relaxation times give other petrophysical parameters such as permeability, capillary pressure, the distribution of pore sizes and hydrocarbon identification...

... of the flow potential. This relaxation time is sometimes comparable to the transient time defined as the time these molecules take to exit from a pore throat, or a pore body. One can expect major elastic effects when the polymer molecule relaxation time is comparable to its transient time. In many instances...