... measurements and log data which led to the modification of the NMR acquisition program in the field and creation of a data-driven petrophysical model based on only NMR and image log measurements for carbonate reservoirs. complex reservoir porosity tool 1 upstream oil & gas relaxation well...

.... The image data is averaged over a moving window, and a transform is constructed, which calibrates the average image data to porosity. This transform is then applied to the "pixel-by-pixel" image data, and a moving adjustment for bias is made. The second step is to analyse the T 1 and T 2 relaxations...

... and materials drilling fluid formulation cutoff reservoir characterization artificial intelligence fluid loss control reserves evaluation drilling fluid chemistry well logging estimates of resource in place upstream oil & gas viscosity sidetrack symposium june 24 formation oil relaxation...

... temperatures, from 22 °C to 90 °C, show that the relaxation time T2 s of hydrocarbon components increase with temperature due to molecular mobility increasing but at different rates, implying that hydrocarbons present in different environments (e.g., organic and inorganic pores) within these tight core samples...

... ABSTRACT At low viscosities, it is well known that the NMR T 1 and T 2 relaxation times of bulk fluids are inversely proportional to viscosity. However, one of the much debated mysteries in NMR relaxation measurements of crude oils is the departure from expected theoretical trends...

... of the grain matrix contains a variation of fine- grained silicate and carbonate minerals such as illite/smectite, chlorite, kaolinite, quartz, k-feldspar, calcite, dolomite, and pyrite, etc. Different minerals impact NMR relaxation very differently. Paramagnetic-rich minerals will accelerate the relaxation...

... T1 and T2 components with high accuracy and precision in low porosity formations while maintaining acceptable logging speeds. This measurement capability was made possible by enabling a new pulse sequence that greatly enhances the sensitivity to fast relaxing components. The robustness of the data...

...SPWLA 56 th Annual Logging Symposium, July 18-22, 2015 1 DETERMINATION OF WETTABILITY FROM MAGNETIC RESONANCE RELAXATION AND DIFFUSION MEASUREMENTS ON FRESH-STATE CORES Chanh Cao Minh, Steve Crary, Philip M. Singer, Andrea Valori, Nate Bachman, Schlumberger Gabor Hursan, Shouxiang Ma, Ali Belowi...

... information. log analysis Engineering West Africa Upstream Oil & Gas well logging facies statistical approach Symposium reservoir blind well spwla 56 formation testing fracture permeability relaxation carbonate resistivity fracture density porosity Halliburton tight test...

... log analysis diffusive coupling relaxation Upstream Oil & Gas porosity Reservoir Characterization federal university spwla 55 well logging Simulation connectivity Indiana limestone Walker diffusion magnetic resonance permeability coefficient Rio de Janeiro University...

... follows is a brief overview of the measurements performed on these unconventional samples. NMR MEASUREMENTS Overview. In NMR measurements the proton (hydrogen nuclei) spins of the fluids within the pore space are manipulated by a magnetic field and their relaxation is measured. The initial amplitude...

... of resistivity contrast between the two makes it difficult, if not impossible, to make such differentiation using conventional logs. However, the NMR response in bitumen-rich zones is dominated by short transverse relaxation times (T 2 ) and low apparent fluid hydrogen index, providing an opportunity to identify...

... the sections which are suitable for completion using a pre-selected mesh size. spwla 51 Upstream Oil & Gas log analysis information porosity Symposium reservoir relaxation mesh size Australia size distribution grain size distribution petrophysicist well logging decay nuclear magnetic...

... Upstream Oil & Gas autocorrelation function relaxation Oil Viscosity well logging correlation prediction power-law relationship log analysis relaxation mechanism heavy oil sample correlation function spwla 50 coupling equation Symposium heavy oil Kleinberg viscosity...

... for presentation at the SPWLA 50th Annual Logging Symposium held in The Woodlands, Texas, June 21-24, 2009. ABSTRACT The NMR relaxation response of porous reservoir rock is frequently used to gain length scale estimates of pore morphology. These pore size distributions are often an- chored by experiments like...

... relaxation rate and the pore geometry. In pores satisfying such a condition, but having a significant spatial variation of surface relaxivity (ρ), one can show that the one-to-one mapping may break down. The degree to which the NMR logging interpretation is affected has not been systematically studied until...

... Abstract Relaxation of the polarized nuclear spins of pore-filling fluid at the grain interface is an essential component in the application of NMR to logging. The observed relaxation is often multi-exponential and the probability distribution of the relaxation times is usually interpreted...

... was prepared for presentation at the SPWLA 49th Annual Logging Symposium held in Edinburgh, Scotland, May 25-28, 2008. ABSTRACT Pore size distributions derived from NMR relaxation time measurements are a common descriptor of the morphol- ogy of porous reservoir rock. Typically, they are an- chored...

...-saturated condition are characterized by mono- peak or bi-peak distribution. Compared to the T2 distribution obtained under fully brine-saturated condition, the change of T2 distribution measured on the residual oil saturation depends mainly on the pore structure of the sample and the bulk relaxation time...

... log analysis paramagnetic sphere secular relaxation rate well logging relaxation rate relaxation free diffusion regime time scale concentration particle diffusion dependence motionally surface concentration gradient equation Upstream Oil & Gas regime paramagnetic particle...