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Raymer model

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<span class="search-highlight">Raymer</span> <span class="search-highlight">model</span>: comparison between exact rock-physics <span class="search-highlight">model</span> (solid black line...

Raymer model: comparison between exact rock-physics model (solid black line...

Published: 14 September 2016
Figure 1. Raymer model: comparison between exact rock-physics model (solid black lines) and linear approximation (dashed red lines). Top plots: (a) P-wave velocity and (b) S-wave velocity versus porosity (clay volume varies from 0 to 1 with steps of 0.2, water saturation is assumed to be constant
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<span class="search-highlight">Raymer</span> <span class="search-highlight">model</span>: comparison between exact rock-physics <span class="search-highlight">model</span> (solid black line...

Raymer model: comparison between exact rock-physics model (solid black line...

Published: 14 September 2016
Figure 2. Raymer model: comparison between exact rock-physics model (solid black lines) and linear approximation (dashed red lines). Top plots show the piecewise linearization: (a) P-wave velocity and (b) S-wave velocity versus porosity (clay volume varies from 0 to 1 with steps of 0.2, water
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The LRP forward-<span class="search-highlight">modeling</span> results in well W5. The solid black line, solid re...

The LRP forward-modeling results in well W5. The solid black line, solid re...

Published: 02 September 2024
Figure 4. The LRP forward-modeling results in well W5. The solid black line, solid red line, and dashed blue line represent the well-log data, Raymer model forward-modeling results, and linearized Raymer model forward-modeling results, respectively.
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Rock-physics <span class="search-highlight">model</span> calibration (<span class="search-highlight">Raymer</span>-Dvorkin <span class="search-highlight">model</span>): (a) P-wave velocity ...

Rock-physics model calibration (Raymer-Dvorkin model): (a) P-wave velocity ...

Published: 14 September 2016
Figure 6. Rock-physics model calibration (Raymer-Dvorkin model): (a) P-wave velocity versus porosity and (b) S-wave velocity versus porosity. Log measurements are color coded by clay volume. Black curves represent (a) Raymer model and (b) Raymer-Dvorkin model for six values of clay volume (from
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Comparison of the inversion result profiles of elastic parameters between t...

Comparison of the inversion result profiles of elastic parameters between t...

Published: 02 September 2024
Figure 17. Comparison of the inversion result profiles of elastic parameters between the RCSR and LRP inversion methods (the Raymer model): (a)  V P , (b)  V S , and (c) density.
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Comparison of the inversion result profiles of petrophysical parameters bet...

Comparison of the inversion result profiles of petrophysical parameters bet...

Published: 02 September 2024
Figure 18. Comparison of the inversion result profiles of petrophysical parameters between the RCSR and LRP inversion methods (the Raymer model): (a) porosity, (b) clay content, and (c) water saturation.
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Forward-<span class="search-highlight">modeling</span> results of different rock-physics <span class="search-highlight">models</span> in W3 and W5. The...

Forward-modeling results of different rock-physics models in W3 and W5. The...

Published: 02 September 2024
Figure 2. Forward-modeling results of different rock-physics models in W3 and W5. The solid black, blue, and green lines represent the well-log data, the Raymer model forward-modeling results, and the Gassmann model forward-modeling results, respectively. (a) Forward-modeling results in well W3
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Comparison of the elastic parameter atoms in the original dictionary with t...

Comparison of the elastic parameter atoms in the original dictionary with t...

Published: 02 September 2024
Figure 8. Comparison of the elastic parameter atoms in the original dictionary with the elastic parameter atoms obtained by the Raymer model forward modeling using petrophysical parameter atoms. The solid red line represents the actual elastic parameter atoms, and the dashed blue line represents
Journal Article

Petrophysical parameter estimation using a rock-physics model and collaborative sparse representation

Yaojun Wang, Bingxin Shen, Zilin Yu, Lin Li, Tuo Zhang, Ting Chen
Journal: Geophysics
Published: 02 September 2024
Geophysics (2024) M149–M168.
DOI: https://doi.org/10.1190/geo2024-0006.1
...Figure 4. The LRP forward-modeling results in well W5. The solid black line, solid red line, and dashed blue line represent the well-log data, Raymer model forward-modeling results, and linearized Raymer model forward-modeling results, respectively. ...
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Rock-physics <span class="search-highlight">model</span> approximation (<span class="search-highlight">Raymer</span>-Dvorkin <span class="search-highlight">model</span>). (a) P-wave velocit...

Rock-physics model approximation (Raymer-Dvorkin model). (a) P-wave velocit...

Published: 14 September 2016
Figure 7. Rock-physics model approximation (Raymer-Dvorkin model). (a) P-wave velocity, (b) S-wave velocity, and (c) density (black curves represent the actual well log, red curves represent the rock-physics model predictions, and dashed blue curves represent the linearized model predictions).
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Rock-physics <span class="search-highlight">model</span> inversion of elastic-log data (<span class="search-highlight">Raymer</span>-Dvorkin <span class="search-highlight">model</span>). Fr...

Rock-physics model inversion of elastic-log data (Raymer-Dvorkin model). Fr...

Published: 14 September 2016
Figure 8. Rock-physics model inversion of elastic-log data (Raymer-Dvorkin model). From left to right: posterior probability distributions of porosity, clay volume, and water saturation (black lines represent the actual well data, and the background color represents the posterior probability
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Same as Figure 2 but with <span class="search-highlight">Raymer</span> et al. (1980) <span class="search-highlight">model</span> curves plotted on to...

Same as Figure 2 but with Raymer et al. (1980) model curves plotted on to...

Published: 01 August 2007
Figure 4. Same as Figure 2 but with Raymer et al. (1980) model curves plotted on top of the data. The upper curve is for zero clay content while the lower curve is for clay content 0.5. The curves in between are for clay content increasing with 0.1 increment.
Journal Article

Bayesian linearized rock-physics inversion

Dario Grana
Journal: Geophysics
Published: 14 September 2016
Geophysics (2016) 81 (6): D625–D641.
DOI: https://doi.org/10.1190/geo2016-0161.1
...Figure 1. Raymer model: comparison between exact rock-physics model (solid black lines) and linear approximation (dashed red lines). Top plots: (a) P-wave velocity and (b) S-wave velocity versus porosity (clay volume varies from 0 to 1 with steps of 0.2, water saturation is assumed to be constant...
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Journal Article

Multivariate probabilistic rock-physics models using Kumaraswamy distributions

Dario Grana
Journal: Geophysics
Published: 30 August 2021
Geophysics (2021) 86 (5): MR261–MR270.
DOI: https://doi.org/10.1190/geo2021-0124.1
... the analytical solution of the probability distribution of the rock-physics model predictions. The method is evaluated for three rock-physics models: Raymer’s equation, Dvorkin’s stiff sand model, and Kuster-Toksöz’s inclusion model. 22 2 2021 23 4 2021 18 5 2021 2021 Society...
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P-wave velocity (left) and S-wave velocity (right) measured at 40 MPa...

P-wave velocity (left) and S-wave velocity (right) measured at 40 MPa...

Published: 03 November 2010
Figure 13. P-wave velocity (left) and S-wave velocity (right) measured at 40 MPa confining pressure versus porosity. Solid black curves are for the stiff-sand model for 100% quartz matrix, and for 90% quartz and 10% clay matrix. P-wave velocity using Wyllie time average equation
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Impedance versus total porosity in clean reservoir sands, fluid-substituted...

Impedance versus total porosity in clean reservoir sands, fluid-substituted...

Published: 01 February 2004
Figure 1. Impedance versus total porosity in clean reservoir sands, fluid-substituted for wet conditions. The symbols are from well log data, different colors used for different wells. The curves are model-based trends. The upper curve is for the Raymer et al. model while the lower curve
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Probability distribution of the rock-physics <span class="search-highlight">model</span> predictions obtained fro...

Probability distribution of the rock-physics model predictions obtained fro...

Published: 30 August 2021
Figure 8. Probability distribution of the rock-physics model predictions obtained from the Raymer and density equations: (a) P-wave velocity and (b) density. The white lines represent the actual measurements, the red lines represent the mode of the distribution, and the background color
Journal Article

Velocity-porosity relationships, 1: Accurate velocity model for clean consolidated sandstones

Mark A. Knackstedt, Christoph H. Arns, W. Val Pinczewski
Journal: Geophysics
Published: 01 January 2003
Geophysics (2003) 68 (6): 1822–1834.
DOI: https://doi.org/10.1190/1.1635035
... match to the numerical data for Poisson's ratio or V p / V s ratio of dry rock. The Raymer equation is the best of the velocity-porosity models for the water-saturated systems. Gassmann's relations are shown to accurately map between the dry and fluid-saturated states. Based on these results, we propose...
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Crossplot between AI and porosity at the logged well (CDP 70). The correlat...

Crossplot between AI and porosity at the logged well (CDP 70). The correlat...

Published: 10 November 2020
Figure 8. Crossplot between AI and porosity at the logged well (CDP 70). The correlation coefficients of 0.8929 and 0.8980 are based on the sample data (the gray dots) and the ones calculated from the linear fitting equation (the blue line) and Raymer-Wood’s model (the green line). The yellow
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The relationship between compressional modulus of a water-saturated shale a...

The relationship between compressional modulus of a water-saturated shale a...

Published: 16 March 2007
Figure 3. The relationship between compressional modulus of a water-saturated shale and total porosity. Different symbols indicate different wells. The upper curve is from the model of Raymer et al. (1980) , and the lower curve is from the soft sand/shale model of Dvorkin and Nur (1996