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Keywords: equation
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Journal Articles
Petrophysics 63 (04): 519–533.
Paper Number: SPWLA-2022-v63n4a3
Published: 02 August 2022
.... Consequently, we introduce the analytical expressions for electric and magnetic field responses to an electric current dipole source arbitrarily oriented in one-dimension (1D) transversely isotropic media. In addition, we apply these equations to examine both electric and magnetic field responses to a distant...
Journal Articles
Petrophysics 63 (04): 534–548.
Paper Number: SPWLA-2022-v63n4a4
Published: 02 August 2022
... characterization fraction evaluation gr cc posterior probability hydrocarbon saturation calculation resistivity well oblz-1 well 15 mineral zone application saturation granularity equation glauconite PETROPHYSICS, VOL. 63, NO. 4 (AUGUST 2022); PAGES 534 548; 3 FIGURES. DOI:10.30632/PJV63N4...
Journal Articles
Petrophysics 62 (04): 422–433.
Paper Number: SPWLA-2021-v62n4a6
Published: 01 August 2021
... with the Gassmann-Brie and patchy formula, the calculation equation of Gassmann-Brie-Patchy (G-B-P) saturation is established, and the effect of contact softening is considered. The model can be used to calculate water saturation based on acoustic velocity, which provides a new idea for the quantitative evaluation...
Journal Articles
Petrophysics 61 (02): 230–238.
Paper Number: SPWLA-2020-v61n2a8
Published: 01 April 2020
...Lin Wang; Yong Ming He; Yi Hang Xiao; Hong Hui Wang; Fei Ying Ma The classic Lucas-Washburn imbibition equation is applicable only to homogeneous hydrophilic pores, not to hydrophobic and mixed-wet pores. Shale and coalbed rocks contain water-wet pores, oil-wet pores and mixed-wet pores...
Journal Articles
Petrophysics 61 (02): 179–188.
Paper Number: SPWLA-2020-v61n2a4
Published: 01 April 2020
... a workflow and set of equations that allow for bulk rock CEC to be calculated from permittivity measurements of crushed rock using a handheld dielectric probe. A series of quartz-smectite mineral mixtures were prepared and high-frequency (80 MHz to 1.4 GHz) dielectric measurements collected at six relative...
Journal Articles
Petrophysics 60 (06): 733–754.
Paper Number: SPWLA-2019-v60n6a3
Published: 01 December 2019
... wavenumber petrophysics december 2019 algorithm saturation equation LWD resistivity measurement resistivity measurement December 2019 PETROPHYSICS 733 PETROPHYSICS, VOL. 60, NO. 6 (DECEMBER 2019); PAGES 733 754; 13 FIGURES; DOI: 1030632/PJV60N6-2019a3 Deducing Electrical Permittivity of Formations...
Journal Articles
Petrophysics 60 (03): 397–408.
Paper Number: SPWLA-2019-v60n3a3
Published: 01 June 2019
... permeability pore network Imaging tortuosity equation 397 PETROPHYSICS June 2019 PETROPHYSICS, VOL. 60, NO. 3 (JUNE 2019); PAGES 397 408; 9 FIGURES; 2 TABLES. DOI: 10.30632/PJV60N3-2019a3 Finite-Volume Computations of Shale Tortuosity and Permeability From 3D Pore Networks Extracted From Scanning...
Journal Articles
Petrophysics 60 (03): 421–428.
Paper Number: SPWLA-2019-v60n3a5
Published: 01 June 2019
... approach is successful in correlating all of Klinkenberg's data to within 5%. However, the improvements due to the modified Klinkenberg equation are marginal and do not explain all the disagreement. For this reason, a second dataset, published by Ash and Grove, was explored. This dataset, which has been...
Journal Articles
Petrophysics 60 (02): 181–207.
Paper Number: SPWLA-2019-v60n2t1
Published: 01 April 2019
... & Well Log Analysts well logging log analysis Artificial Intelligence correlation workflow mineral pyrite equation water saturation inversion estimation estimate storage capacity total porosity total water saturation saturation reservoir organic mudstone petrophysics Upstream Oil...
Journal Articles
Petrophysics 60 (02): 208–227.
Paper Number: SPWLA-2019-v60n2t2
Published: 01 April 2019
... these two power laws are combined into a single equation, it can be solved for water saturation (which is not observable from a borehole) in terms of bulk formation resistivity, interstitial brine resistivity, and porosity (all of which can be estimated from observations made in boreholes...
Journal Articles
Petrophysics 59 (03): 276–287.
Paper Number: SPWLA-2018-v59n3t1
Published: 01 June 2018
... provide some guidance or at least guidelines on the application of my favorite models (equations, transforms, or any of your personal preference names) used to calculate water saturation from a combination of electrical conductivity (i.e., inverse of resistivity), total porosity, formation water salinity...
Journal Articles
Petrophysics 59 (02): 185–200.
Paper Number: SPWLA-2018-v59n2a5
Published: 01 April 2018
... petrophysical parameters, such as water-filled porosity, salinity, textural information, and flushed-zone resistivity. Inspired by the Pickett plot as a visual representation of the Archie equation, we propose a new graphical method that we call Complex-Domain Analysis (CDA) to solve dielectric-mixing-law...
Journal Articles
Petrophysics 58 (05): 454–469.
Paper Number: SPWLA-2017-v58n5a1
Published: 01 October 2017
... Log Analysts Upstream Oil & Gas water saturation electrical conductivity well logging pore assessment application conductivity log analysis Simulation depolarization factor hydrocarbon saturation wettability equation saturation percolation threshold exponent mixed-wet rock...
Journal Articles
Petrophysics 58 (04): 366–375.
Paper Number: SPWLA-2017-v58n4a3
Published: 01 August 2017
... capillary pressure and equilibrium is approached with time. We present general partial differential equations describing the setup and consider a multispeed drainage sequence from one equilibrium state (at a given rotational speed) to the next. By appropriate simplifications we derive that the process...
Journal Articles
Petrophysics 57 (05): 465–478.
Paper Number: SPWLA-2016-v57n5a3
Published: 01 October 2016
... dependency Reservoir Characterization mathematics equation FOEP petrophysical result propagation october 2016 asymmetrical distribution error propagation porosity vector error calculation petrophysics October 2016 PETROPHYSICS 465 PETROPHYSICS, VOL. 57, NO. 5 (OCTOBER 2016); PAGE 465 478; 14...
Journal Articles
Petrophysics 57 (01): 51–59.
Paper Number: SPWLA-2016-v57n1a5
Published: 01 February 2016
...Richard Bootle Shaly sand equations are a well-established petrophysical principle. However the solutions to these equations are complex and there is a lack of clarity regarding their optimal implementation and numerous input parameter assumptions. This paper considers the Δ S w impact of shaly...
Journal Articles
Petrophysics 56 (01): 32–44.
Paper Number: SPWLA-2015-v56n1a3
Published: 01 February 2015
... equations containing relaxation, diffusion and magnetization transport terms. The equations are subject to boundary conditions describing surface relaxation. The NMR description we use enables performing modeling of T 2 relaxation and PGSE experiments, and their combination. The numerical NMR solver is also...
Journal Articles
Petrophysics 55 (06): 543–553.
Paper Number: SPWLA-2014-v55n6a1
Published: 01 December 2014
... Analysts cation exchange capacity total porosity evaluation saturation log analysis shaly-sand model shale conductivity resistivity well logging relation porosity december 2014 bound-water saturation Upstream Oil & Gas dry-clay parameter equation exponent shale resistivity clay...
Journal Articles
Petrophysics 55 (05): 447–460.
Paper Number: SPWLA-2014-v55n5a5
Published: 01 October 2014
... coreood experiment Simulation experiment injection permeability equation October 2014 PETROPHYSICS 447 ABSTRACT PETROPHYSICS, VOL. 55, NO. 5 (OCTOBER 2014); PAGE 447 460; 14 FIGURES; 4 TABLES Quantifying the Impact of Petrophysical Properties on Spatial Distribution of Contrasting Nanoparticle...
Journal Articles
Petrophysics 55 (02): 96–112.
Paper Number: SPWLA-2014-v55n2a3
Published: 01 April 2014
...Oliver C. Mullins; Julian Y. Zuo; Kang Wang; Paul S. Hammond; Ilaria De Santo; Hadrien Dumont; Vinay K. Mishra; Li Chen; Andrew E. Pomerantz; Chengli Dong; Hani Elshahawi; Douglas J. Seifert Downhole fluid analysis (DFA) is used to characterize compositional fluid gradients, and equations of state...

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