... size distributions. This relationship can be leveraged to derive permeability models or determine irreducible saturations using relaxation time cutoffs. However, the analysis of complex carbonates, such as those found in pre-salt formations, reveals a wide variability in cutoff values determined...

... of information. In this paper, we analyze NMR data from core analysis and wireline logs, calibrate appropriate T 1 -T 2 cutoff values to identify hydrocarbons, compute saturations, and generate permeability models. We then build a petrophysical model, for the formations of interest, which is applied to multiple...

... be misinterpreted as pore volume. Previous attempts to eliminate the surface fluid signal employed a cutoff to the pore size distribution curve to distinguish fluid in the pores (below the cutoff) from fluid on the surface (above the cutoff). Unfortunately, the use of cutoffs is prone to error as the position...

... component analysis. The free fluid T2 cutoff is chosen based on the identified modes. The NMR irreducible water saturation ( S wirr ) computed with this cutoff agrees with Dean-Stark Sw, measured on core samples assumed to be fully invaded by OBM. Continuous Sw is calculated with Archie’s equation with lab...

... 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...

... well logging log analysis core analysis sand injectite reservoir cutoff porosity sandstone brecciated interval dyke upstream oil & gas shale spwla 61 reservoir characterization structural geology petrophysical property july 29 injectite june 24 clast interpretation...

...- particle pores by either the T2 cutoff or T1/T2 cutoff. The research conducted by Fleury et al. (2016) using higher frequency (23 MHz) NMR also suggests exploiting T1/T2 for methane identification. Besides T1/T2, diffusivity D measurement by NMR is widely implemented for composition estimation. Hürlimann...

..., no comprehensive temperature correlations of key NMR logging deliverables, such as the distributions and geometric means of T 1 or T 2 , are available. log analysis principal component correlation Artificial Intelligence macro porosity cutoff data sample well logging cutoff reservoir...

... the challenges mentioned above. The workflow builds on recent advancements to extract maximum information from minimal NMR data acquisition, such as factor analysis, a statistical method to determine various T2 cutoffs, and fluids substitution, a method to replace all hydrocarbons with water in T2 distribution...

... logs, which can detect extremely fine layers with thickness of several millimeters. Traditionally, explicit sand counting in thin beds has been done by applying a user-specified cutoff on a 1-D high-resolution resistivity curve extracted from electrical borehole images. The workflow generally requires...

... machine learning flow in porous media shape analysis porosity well logging Fluid Dynamics gross hydrocarbon Artificial Intelligence cutoff spwla 59 Symposium Chevron pore throat hydrocarbon carbonate saturation log analysis Upstream Oil & Gas permeability cutoff...

... those with interparticle porosity. However, according to petrophysical laboratory data, rocks with moldic porosity have significantly lower permeability values. As for centrifuge analyses, SWirr values were about 9% higher than those obtained with standard 100 ms cutoff on T2 relaxing time, showing weak...

.... The MRIL run in this well can be seen in Figure 7. NMR analysis of cleaned and re-saturated core in this interval show a clay bound T2 cutoff of the standard 2.8 msec and a bulk volume irreducible water cutoff of approximately 17 msec. Both cutoffs are shown in this figure with vertical lines and indicate...

... in these reservoirs, the widespread use of conventional NMR T2 interpretation parameters has been incorporated into the analysis. Typical T2 cutoff interpretation parameters in use are ≤ 3 ms clay bound water, 3 to 33 ms for capillarity-bound fluids, and >33 ms for free fluids, which is the traditional value used...

... a novel scheme. The novel classification is done by applying carefully designed cutoffs to the pore throat radii of the core samples and is propagated to the entire well with an artificial neural network. For each rock type, the parameters in the Timur-Coates permeability equation are calibrated with core...

... ABSTRACT This paper presents a new methodology for performing a cutoff analysis that uses a T 1 /T 2 ratio distribution obtained from two-dimensional (2D) nuclear magnetic resonance (NMR) T 1 and T 2 measurements. The ability to classify pores and their effect on permeability is noticeably...

... to verify the cutoff and T1/T2 ratio trend to improve fluid identification in TRU and shale reservoirs. The workflow has been successfully applied to evaluate petrophysical properties in the Marcellus and Vaca Muerta formations. It reduces the uncertainty of total porosity and free fluid volume (FFV...

.... The bound fluids are further sub-divided into clay-bound water components and irreducible components held by capillary forces. The movable water and hydrocarbon volumes can be estimated using simple T2 cutoff approaches or more sophisticated 2D-NMR methods (the latter of which are generally only available...

... on "Exploratory Factor Analysis" (Jain et al, 2013) was used to determine underlying poro-fluid structure. This helps address perennial questions such as: the number of poro-fluid components in the NMR T2 distribution, and their respective T2 cutoffs; characteristics, identification and volumes...

... Abstract The purpose of this application is to provide the petrophysicist with a tool that can scope out dynamically the effects cutoffs have on the modeling effort. As it stands currently the effect of porosity, volume of shale or permeability cutoffs are easily assessed with regard...