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Keywords: cutoff
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Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0062
... 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...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5011
... for is determined by principal 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...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5089
... 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...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5057
... 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...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-K
... diffusivity bulk diffusivity connate water well logging cutoff porosity Symposium methane subplot spwla 60 log analysis laboratory measurement correlation map hydrocarbon NMR porosity laboratory condition propane composition diffusion saturation decane SPWLA 60th Annual Logging...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-HH
..., 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...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-V
... 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...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-M
... 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...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-D
... ABSTRACT Assessment of net pay cutoffs in carbonates is more challenging than in clastics due to inherent heterogeneity of pore architecture and permeability. Historically, the success rate of flowing perforations is low, and operators tend to "over-perforate" to capture all potential flowing...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-GGG
... 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...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-EE
.... 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...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-GGGG
... 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...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-RRRR
... into a number of petrophysical rock types using 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...
Proceedings Papers

Paper presented at the SPWLA 58th Annual Logging Symposium, June 17–21, 2017
Paper Number: SPWLA-2017-RR
... 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...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-PP
... 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...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-CCCC
.... 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...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-UU
... 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...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-Y
... 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...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-X
...) to determine the fluid-related bin porosities and T2 cutoffs. A step-by-step workflow is provided allowing petrophysicists to use this technique in their daily work. The fluid substitution process is illustrated through several examples. In the first example, laboratory T2 measurements were acquired on a core...
Proceedings Papers

Paper presented at the SPWLA 56th Annual Logging Symposium, July 18–22, 2015
Paper Number: SPWLA-2015-LLL
... the cutoff, for a range from 40 to 320 feet. The color of the data points varies strictly with the average GR (y-axis) value. Two episodes where GR increases above 1000 GAPI are marked by the rectangles in Figure 8. The first occurs during peak development of these heavy oil sands from 1981 to 1990...

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