... relaxation described empirically as distorted Cole-Cole plots. A frequently used model that captures the three relaxation effects, and the one used in this study, is the Havriliak-Negami (HN) model ( Havriliak & Negami, 1967 ), Abstract Combinations of dielectric and NMR measurements are frequently...

...Introduction Abstract NMR-based carbonate interpretation models are commonly calibrated using laboratory ambient core NMR measurements. For applying the core calibrated models to downhole NMR logging interpretation, the difference between the NMR responses measured at ambient and reservoir...

...Introduction well logging texas cream limestone wettability index workflow enhanced recovery berea sandstone water saturation wettability state upstream oil & gas nmr measurement assessment saturation log analysis resistivity index estimate water saturation model parameter...

... Abstract Nuclear Magnetic Resonance (NMR) measurements have been attractive options for fast wettability characterization of rocks in petroleum reservoirs. Several NMR-based wettability indices are documented in previous publications. These methods often require calibration at irreducible water...

.../chromium gel system for application in a high-temperature and high-salinity (HTHS) carbonate reservoir. Oil displacement experiments on carbonate core samples, combined with nuclear magnetic resonance (NMR) measurements were performed to demonstrate oil recovery improvement by gel treatment and illustrate...

... In the previous work ( Kwak et al. 2016 ) and this paper, generalized interpolation-based techniques are used to predict carbonate rock properties with NMR measurements. The use of RBF method for solving inverse problem encountered in well-logging was first proposed by Freedman (2006...

... that structural clays even at high volumetric concentrations of 40% produce negligible effect on NMR measurements. Shale laminations containing clay were found to produce an effect of up to 17.5% on T 2 relaxation time constant that could cause a relative error of 23.1% in estimates of dominant pore size...

...-bearing solution in the rock samples and simultaneously analyze NMR measurements before and after injection of the contrast solution. We introduced a method to eliminate the impact of isolated pore space from the NMR T 2 distribution, which is then used for improved permeability assessment. To confirm...

... pore Upstream Oil & Gas decay curve porosity organic porosity dodecane saturation NMR measurement mncl 2 spectrum plug interface NMR spectrum imbibition Sondergeld clay-bound water Introduction Productive shales are fine-grained rock, generally less than 4μm, containing...

... SPION solution NMR measurement deionized water Upstream Oil & Gas concentration carbonate rock sample rock sample relaxation time ppm SPION solution well logging sandstone rock sample experiment matrix injection fracture log analysis pore connectivity numerical simulation...

... or sliding in a range of hole sizes, including large holes previously inaccessible to LWD NMR measurements. Benefits and trade-offs of key tool design features are presented. Emphasis is placed on measurement quality, operational simplicity and log quality control in real time and memory mode through...

... and permeability information - a continuous fluid log of oil, gas, water and OBM filtrate (OBMF) at multiple depths of investigation. The radial fluid profiling allows discrimination of OBMF versus native oil. Additionally, within the hydrocarbon column the NMR measurements can be used to provide continuous logs...

... that they naturally complement with NMR measurements. To this end, we develop a comprehensive numerical model that successfully reproduces the kHz-to-GHz dielectric dispersion measured on a variety of rock and fluid conditions, wettability, and clay content. Our model is based on the solution of Maxwell's equations...

... Abstract Downhole nuclear magnetic resonance (NMR) measurements are evolving into a powerful formation evaluation tool, providing unique and critical information including formation porosity, pore-size distributions, bound-fluid volume (BFV), free-fluid volume (FFV), permeability, and fluid...

... nmr measurement log analysis petroleum engineer laboratory equation irreducible water saturation venezuela government artificial neural relaxation coefficient algorithm Introduction The permeability and the irreducible water saturation are fundamental properties used in the reservoir...

... & gas dolomite levallois sandstone log analysis nmr measurement trace trace 0 relaxation time nmr log Introduction A complex geology requires an extensive coring program to understand better the rock properties and link their petrophysical behaviors (irreducible water saturation...

... plug downhole data sandstone saturation relation amplitude contribution log analysis nmr core analysis pore size distribution well logging resolution nmr measurement permeability core analysis water saturation shale interpretation upstream oil & gas porosity laboratory...

... to water saturation calculations that rarely reflect future production. Recent work in this formation demonstrates that Nuclear Magnetic Resonance (NMR) is an effective evaluation tool. Lab NMR measurements on core plugs accurately predict pore size distributions that have been used to estimate...