... on the echo spacing (Brown et al, 1993; log analysis paramagnetic sphere secular relaxation rate Upstream Oil & Gas regime paramagnetic particle concentration particle time scale fine sand localization regime diffusion motionally surface concentration gradient equation well logging...

... condition pressure gradient velocity fluctuation Flow property Symposium gradient spwla 47 Upstream Oil & Gas relaxation rate well logging acoustic nmr relaxation rate magnetic field gradient fluid mobility formation fluid mobility mobility flow velocity permeability SPWLA 47th Annual...

... Equation 4 indicates that the error causedby the relaxationratesare within an acceptableerror range)is motion effect decreaseswith increasingtool aperture. a function of relaxation rate, echo tram length, antenna Figure 1 shows the magnetization error for three aperture,and magnet design.Too high logging...

..., the unexpected shifts can lead to confusion when using the current interpretation models, and quantitatively, attempts to compensate for incomplete polarization using only bulk methane relaxation parameters will lead to overestimates of gas porosity. Upstream Oil & Gas relaxation rate equation 2...

... ABSTRACT When a rock sample or formation is subjected to a static magnetic field, magnetic susceptibility contrasts between rock grains and pore fluids induce local magnetic field heterogeneities. These local field fluctuations cause increases in the transverse (T2) relaxation rate. Under...

.... log analysis cross plot log measurement Symposium well logging relaxation rate msec spwla 36th numar diffusion log data viscosity diffusion oil-water mixture Upstream Oil & Gas relaxation time equation oil zone Oil Viscosity saturation pore size SPWLA 36th Annual Logging...