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  • File:Thin-section-analysis fig1.png
    ...m of nonfracture porosity types in sandstones summarizing the influence of porosity type on reservoir quality. (Modified after Pittman, 1979.)
    (933 × 870 (15 KB)) - 21:07, 14 January 2014
  • File:Evaluating-fractured-reservoirs fig1.png
    ...italic></sub>= matrix permeability, ϕ<sub><italic>r</italic></sub>= matrix porosity.
    (942 × 642 (23 KB)) - 15:00, 14 January 2014
  • File:Porosity fig3.png
    Idealized carbonate porosity system showing three basic porosity groups: fabric selective, not fabric selective, and fabric selective or not
    (950 × 757 (24 KB)) - 18:19, 14 January 2014
  • Determining porosity from density–neutron logs
    #REDIRECT [[Density-neutron log porosity]]
    42 bytes (4 words) - 19:46, 14 January 2015
  • Determining porosity from density-neutron logs
    #REDIRECT [[Density-neutron log porosity]]
    42 bytes (4 words) - 16:56, 19 December 2014
  • Predicting sandstone porosity and permeability
    #REDIRECT [[Sandstone porosity and permeability prediction]]
    60 bytes (6 words) - 20:15, 19 May 2014
  • Basics of carbonate porosity formation and preservation
    #REDIRECT [[Carbonate porosity formation and preservation]]
    59 bytes (6 words) - 14:52, 19 December 2014
  • Core-log transformations and porosity-permeability relationships
    #REDIRECT [[Core-to-log transformations and porosity-permeability relationships]]
    81 bytes (6 words) - 15:37, 19 December 2014
  • File:Core-log-transformations-and-porosity-permeability-relationships fig2.png
    Plot showing shitted core porosity, together with bulk density log.
    (931 × 1,163 (74 KB)) - 18:05, 14 January 2014
  • File:Core-log-transformations-and-porosity-permeability-relationships fig4.png
    Air permeability versus helium porosity from North Sea sandstone, conglomerate, and shale.
    (941 × 890 (53 KB)) - 18:06, 14 January 2014
  • File:Core-log-transformations-and-porosity-permeability-relationships fig1.png
    Plot showing unshifted core porosity in spiked format, together with bulk density log.
    (938 × 1,169 (73 KB)) - 18:05, 14 January 2014
  • File:Core-log-transformations-and-porosity-permeability-relationships fig5.png
    Slip-corrected permeability (run under stress) versus helium porosity from McArthur River Field, Alaska.
    (912 × 1,127 (19 KB)) - 18:06, 14 January 2014
  • File:Core-log-transformations-and-porosity-permeability-relationships fig6.png
    Permeability versus porosity for various size groups in uniformly cemented nonvuggy rocks. (Taken from L
    (934 × 903 (17 KB)) - 18:06, 14 January 2014
  • File:Subsurface-maps fig5.png
    Porosity-weighted average water saturation map for Layer 2 of a Middle Eastern carbo
    (889 × 1,444 (71 KB)) - 20:42, 14 January 2014
  • File:Porosity fig2.png
    Idealized sandstone porosity system showing four basic pore types: intergranular, microporosity, dissolu
    (936 × 434 (96 KB)) - 18:19, 14 January 2014
  • File:Evaluating-diagenetically-complex-reservoirs fig3.png
    Porosity-permeability semilog crosspiot with samples coded according to grain size,
    (920 × 1,033 (84 KB)) - 18:46, 14 January 2014
  • Sandstone porosity and permeability prediction
    ...t on porosity and permeability, this subsection concentrates on predicting porosity and permeability by considering the effects of diagenesis. * [[Predicting sandstone reservoir porosity]]
    2 KB (300 words) - 20:29, 5 April 2022
  • File:Using-and-improving-surface-models-built-by-computer fig24.png
    Incomplete data for net and porosity due to partial penetrations, truncations, baselaps, and so on create proble
    (878 × 508 (15 KB)) - 22:33, 13 January 2014
  • File:Evaluating-tight-gas-reservoirs fig3.png
    Histograms showing (a) average porosity values and (b) average permeability values for cored tight gas reservoir fa
    (1,964 × 879 (37 KB)) - 18:47, 14 January 2014
  • File:Porosity fig4.png
    Schematic diagram of packing arrangements for spheres. Porosity values are calculated for cubic (47.6%), orthorhombic (39.5%), rhombohedral
    (1,895 × 1,463 (110 KB)) - 18:19, 14 January 2014
  • File:Forward-modeling-of-seismic-data fig2.png
    ...of a migrated section, the expected seismic signatures of reefs containing porosity and tight reefs have been obtained.
    (1,953 × 1,097 (49 KB)) - 14:35, 14 January 2014
  • File:Using-and-improving-surface-models-built-by-computer fig22.png
    ...bon rock thickness is progressively reduced by net to gross ratio, average porosity, and oil saturation, until only the thickness of pores filled with hydrocar
    (938 × 308 (15 KB)) - 22:33, 13 January 2014
  • File:Subsurface-maps fig6.png
    Porosity thickness (ϕH) maps for the B and C zones from the San Andres Formation re
    (1,944 × 1,484 (237 KB)) - 20:42, 14 January 2014
  • File:Forward-modeling-of-seismic-data fig1.png
    ...section of a carbonate reef play. The reef structure on the left contains porosity, while the reef structure on the right is tight.
    (1,946 × 1,028 (96 KB)) - 14:35, 14 January 2014
  • Carbonate diagenetic stages
    ==Stages affect porosity== ...o. 2, p. 207–250. Classic reference for basic concepts regarding carbonate porosity.</ref>
    6 KB (727 words) - 19:06, 6 April 2022
  • File:Porosity fig1.png
    Schematic of a pore system relating mineralogy, water content, and porosity assessment. (Notes: *lf sample is completely disaggregated during measureme
    (1,942 × 983 (76 KB)) - 18:19, 14 January 2014
  • Postaccumulation cementation
    ...a/bulletns/1990-91/data/pg/0075/0007/0000/1145.htm Empirical prediction of porosity and permeability in sandstones]: AAPG Bulletin, vol. 75, p. 1145–1160.</r ...l point]] as the pore volume within the structural closure decreases. If [[porosity]] is lowered sufficiently, the [[accumulation]] may be subeconomic in size.
    3 KB (430 words) - 15:35, 1 February 2022
  • Sandstone diagenesis: composition and texture
    .... The ratio of quartz to [[Ductility|ductile]] grains is key to compaction porosity loss. ==Influence of grain size on porosity and diagenesis==
    5 KB (729 words) - 20:48, 5 April 2022
  • File:Evaluating-fractured-reservoirs fig4.png
    ...ures plotted as a function of fracture width, fracture spacing, and matrix porosity. Copyright: Nelson, 1985</xref>; courtesy of Gulf Publishing Co.
    (1,929 × 1,078 (31 KB)) - 15:00, 14 January 2014
  • Pore system shapes
    ...y'''. In most cases, water saturation (S<sub>w</sub>) of rocks with Archie porosity can be predicted from log analysis using the [[Archie equation]] * Φ = [[porosity]]
    4 KB (528 words) - 13:53, 4 April 2022
  • Reservoir system quality prediction
    ...ermining reservoir system performance.The interrelationship of reservoir [[porosity]], [[permeability]], thickness, and lateral distribution determines reservo ...o. 2, p. 207–250. Classic reference for basic concepts regarding carbonate porosity.</ref> compares variables affecting reservoir system quality for sandstones
    3 KB (425 words) - 17:11, 5 April 2022
  • File:Borehole-gravity fig1.png
    ...log. The sharp difference In density between 6330 and 6370 ft is caused by porosity not detected by the gamma-gamma density log. The broader difference anomaly
    (933 × 1,451 (17 KB)) - 15:41, 14 January 2014
  • File:Log-analysis-applications fig5.png
    ...istivity) and relates water saturation (<italic>S</italic><sub>w</sub>) to porosity and true resistivity.
    (929 × 801 (40 KB)) - 16:36, 14 January 2014
  • File:Core-description fig1.png
    ...sedimentary structures are depicted graphically as accurately as possible. Porosity amounts in percent can be scaled as needed. (Modified from Casey, 1980; Boy
    (1,879 × 2,521 (232 KB)) - 22:38, 13 January 2014
  • Fieldwork risk assessment
    ...itical element. For reservoir rock, the main risk might be thickness and [[porosity]] preservation. For source rock, the main risk might be organic richness an * Reservoir porosity
    2 KB (354 words) - 22:07, 1 February 2022
  • Carbonate porosity formation and preservation
    ...lities than an initially poor-quality rock becoming a good-quality rock. [[Porosity]] can be created late in a rock's life; however, concentrating on the early ...o. 2, p. 207–250. Classic reference for basic concepts regarding carbonate porosity.</ref> Surface and shallow diagenesis mainly occurs in fabric-selective por
    5 KB (708 words) - 17:27, 5 December 2023
  • Archie equation
    * Φ = [[porosity]] ...lution), have clay in their matrix, or have moldic, vuggy, or [[fracture]] porosity require adjustments. The table below lists the five variables and methods f
    5 KB (703 words) - 13:52, 5 April 2022
  • Sandstone diagenetic processes
    ...ore type and geometry of a sandstone and therefore controls its ultimate [[porosity]] and [[permeability]]. Early diagenetic patterns correlate with environmen ...ation destroys pore space; grain leaching creates it. Compaction decreases porosity through grain rearrangement, plastic [[deformation]], pressure solution, an
    7 KB (870 words) - 20:30, 5 April 2022
  • Pickett plot construction
    # Plot points of matching [[porosity]] and true resistivity (R<sub>t</sub> ) on log-log paper. ...ormance_fig9-36.png|thumb|300px|{{figure number|1}}Plot points of matching porosity and true resistivity (R<sub>t</sub>) values obtained from well logs on 2×4
    6 KB (878 words) - 16:16, 5 April 2022
  • Predicting sandstone reservoir porosity
    ...porosity. This section presents different methods of predicting sandstone porosity. Choose the method(s) most appropriate to your situation. ==Porosity-depth plots==
    10 KB (1,384 words) - 15:00, 6 April 2022
  • Diagenesis
    ...fter deposition.It can have important effects in decreasing or enhancing [[porosity]] and [[permeability]].
    691 bytes (74 words) - 16:13, 22 October 2014
  • Midale porosity, pore geometries, and petrophysics
    Most of the [[porosity]] in the vuggy [[packstone]] facies is molds and [http://www.merriam-webste ...ance_fig9-102.png|300px|thumb|{{figure number|1}}Crossplot of routine core porosity and permeability from the Midale in an example well at Weyburn field. Copyr
    5 KB (659 words) - 16:54, 12 April 2022
  • Sequences during moderate-amplitude, high-frequency cycles
    * Primary [[porosity]] greatest in grainy upper parts of sequences and thicker [[length::(10 m]] * [[Porosity]] in the sequence tops plugged by [http://www.merriam-webster.com/dictionar
    5 KB (674 words) - 21:22, 6 April 2022
  • Diagenetic trap regime
    ...4 | Diagenetic traps || rowspan = 2 | Diagenetic reservoirs; Form where [[porosity]] is created as a result of local [[Diagenesis|diagenetic processes]] such ...sult of localized leaching of nonreservoir-quality rock to create enhanced porosity and [[permeability]]. Common beneath [[unconformity]] surfaces.
    5 KB (645 words) - 16:14, 13 April 2022
  • Coal bed methane (UDip)
    ...free gas or can be saturated with water. The system is then called a “dual-porosity reservoir”, one characterized by a complex interaction of the coal matrix ==The porosity and permeability of coal==
    10 KB (1,576 words) - 14:42, 2 April 2019
  • Sequences during high-amplitude, high-frequency cycles
    * [[Porosity]] plugged by caliche at sequence caps .../www.oxforddictionaries.com/us/definition/american_english/cap-rock cap] [[porosity]] is intergranular in shoals and in nondolomitized build-ups
    6 KB (761 words) - 13:47, 7 April 2022
  • Morrow lithofacies and pore types: Sorrento field
    ...we see a picture of a clastic reservoir with wide heterogeneity in total [[Porosity|porosities], [[Pore and pore throat sizes|pore-throat sizes]], and [[capill ...solution?) porosity also may be present but is minor. (For definitions of porosity types, see [[Reservoir quality]].)
    6 KB (769 words) - 17:23, 11 April 2022
  • Density-neutron log porosity
    ...] data, especially in formations of complex lithology. Better estimates of porosity are possible with the combination than using either tool or sonic separatel ...y to porosity using charts in a log interpretation chartbook, or calculate porosity from bulk density using this equation:
    12 KB (1,763 words) - 16:18, 5 April 2022
  • Meteoric diagenesis
    ...le, A color guide to the petrography of carbonate rocks: Grains, textures, porosity, diagenesis: [http://store.aapg.org/detail.aspx?id=649 AAPG Memoir 77] p. 3
    648 bytes (87 words) - 15:34, 10 December 2015
  • File:M91Ch13FG88.JPG
    ...wing distinct tips even where they are closely spaced (bottom left photo). Porosity loss resulting from granular rearrangement and clay accumulation in the ban
    (600 × 585 (272 KB)) - 21:36, 29 April 2015

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