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• 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
• Bioturbation
  ...or reworking of sediment by living organisms. It may enhance or decrease porosity and permeability. For instance, burrows filled with sand grains in a mud or
  907 bytes (132 words) - 21:42, 18 September 2014
• Sequences during low-amplitude, high-frequency cycles
  **Dolomitized intertidal laminites (intercrystalline [[porosity]]) **Siliciclastic supratidal caps (intergranular porosity)
  5 KB (708 words) - 21:00, 6 April 2022
• Pressure compartments
  * [[Porosity]] loss due to compaction is less in overpressured and more in underpressure ...educes the supply of free ions associated with cementation and secondary [[porosity]] formation.
  6 KB (828 words) - 17:57, 17 February 2022
• Types of diagenetic traps
  * Primary [[porosity]] preserved due to selective [[Reservoir quality#Cementation|cementation]] * [[Secondary porosity]] created by cement and/or matrix dissolution
  2 KB (294 words) - 21:01, 4 February 2022
• Sandstone
  ...orosity and increase the bed thinning. Deep burial cause decrease the sand porosity dramatically. [[File:Sandstone_Fig-3.png|thumb|300px|Fig. 3. Porosity and Compaction (Derived form Nichols)<ref name=Nichols />]]
  10 KB (1,508 words) - 15:44, 22 March 2019
• Sandstone permeability prediction from texture
  ...-60.png|300px|thumb|{{figure number|1}}Grain size affects permeability and porosity.<ref name=ch09r11>Coalson, E. B., Hartmann, D. J., and Thomas, J. B., 1990, ...nce_fig9-60.png|Figure 1]] shows how grain size affects permeability and [[porosity]].
  9 KB (1,118 words) - 17:03, 6 April 2022
• Cased hole tools
  ...ty and water salinity are known. The porosity devices are used to estimate porosity when lithology is known. Table 1 lists the types of devices used for these | rowspan = 2 | [[Porosity]] || [[Basic open hole tools#Compensated neutron|Compensated neutron]]
  10 KB (1,427 words) - 16:26, 18 January 2022
• Core-to-log transformations and porosity-permeability relationships
  | chapter = Core-log transformations and porosity-permeability relationships ...lity-relationships_fig1.png|{{figure number|1}}Plot showing unshifted core porosity in spiked format, together with bulk density log.
  14 KB (1,893 words) - 20:15, 2 February 2016
• Log interpretation: initial quick scan
  Determining the [[porosity]] and [[True resistivity determination|true resistivity]] of a zone is the ...ich to measure changes. In this case, the [[Basic_open_hole_tools#Porosity|porosity log]] is the primary reconnaissance measurement. By first finding the porou
  4 KB (543 words) - 14:11, 21 August 2014
• Decompaction
  ...ts be corrected to their original thickness before burial using a specific porosity-depth function for each [[lithologic]] unit. This involves sequential [[bac
  1,008 bytes (139 words) - 19:54, 25 June 2015
• Geostatic and lithostatic pressure
  * [[Porosity|Porosities]] of different lithologies * φ = weighted average of rock [[porosity]]
  3 KB (402 words) - 14:47, 16 February 2022
• Fracture traps
  ...ture traps may not. Some might argue that [[fracture]]s are just another [[porosity]] type and should be thought of as part of the [[reservoir]], not as a trap ...rvoir'''—Reservoir in which most of the [[permeability]] and some of the [[porosity]] is provided by open fractures.
  3 KB (461 words) - 16:04, 13 April 2022
• Intact membrane seal leakage
  ...pressure) is less than the capillary displacement pressure of the matrix [[porosity]] of the seal. Under these conditions, the relative [[permeability]] of the ...occurs, oil can leak through the [[fracture]]s without invading the matrix porosity.
  3 KB (475 words) - 17:08, 1 February 2022
• Diagenesis: information from petrology
  | Primary [[porosity]] preservation || Indicates facies patterns may control hydrocarbon distrib ...rap location; mineralogy and/or facies may control location of dissolution porosity || Use [[sequence stratigraphy]], hydrologic, or thermal maturity models.<r
  4 KB (544 words) - 21:38, 4 February 2022
• Subsurface diagenesis and its relation with diagenetic trap on carbonate rocks reservoir
  ==Relation between subsurface diagenesis with porosity changing== ===Increase of porosity===
  16 KB (2,395 words) - 21:18, 9 January 2024
• Formation evaluation of naturally fractured reservoirs
  ...because other features such as a rough borehole, shales, and changes in [[porosity]], lithology, and tool centralization might produce amplitude drops that ha When the tool is run through an unfractured section of reasonably constant porosity, lithology, borehole rugosity, and tool centralization , the shades of dark
  9 KB (1,380 words) - 17:25, 18 January 2022
• Rate of penetration
  ===Relative porosity=== ...tively slow ROP in rocks having low matrix porosity to rocks having higher porosity and faster ROP. This comparison requires that the prevailing drilling condi
  7 KB (1,049 words) - 19:02, 20 January 2022
• Pressure prediction: analysis of well-log and seismic data
  ...variable within shale sections. Because porosity is related to compaction, porosity measurements from well logs can be calibrated to fluid pressure in the pore ...major remaining variable that affects [[rate of penetration]] in shale is porosity.
  5 KB (733 words) - 17:57, 17 February 2022
• Overview of routine core analysis
  ...PA</ref> require laboratory analysis of large diameter cores to evaluate [[porosity]], hydrocarbon saturation, and net pay. (For more on continuous coring, see ...res. These samples can provide useful details of the lithology, petrology, porosity, [[permeability]], and hydrocarbon content of the formation.<ref name=pt05r
  14 KB (2,121 words) - 21:16, 19 January 2022
• Logging while drilling
  ...rements of the formation (electric logs such as gamma ray, resistivity, or porosity), drilling parameters (e.g., downhole torque, weight on bit, temperature, o
  2 KB (206 words) - 21:17, 3 December 2015
• Gravity in petroleum exploration
  ...undings. The borehole gravity meter has broad application, from locating [[porosity]] in wildcats or through [[casing]] in old wells to monitoring fluid change
  1 KB (187 words) - 17:53, 25 January 2022
• What is permeability?
  ...[porosity]] of 30%, and flow unit 2 has a porosity of 10%. The variance in porosity becomes the indicator of the contrast in pore throat size when converted to
  5 KB (694 words) - 20:41, 4 April 2022
• Vibro-sesismic to increasing the production rate of coal bed methane
  ===Porosity and permeability=== ...pearmebility is the capacity of pore material to let fluida flow.When the porosity increase, the pearmeability will also increase, and the production result w
  11 KB (1,551 words) - 16:49, 11 January 2016
• Fractured membrane seal leakage
  ...petroleum column]] exceeds the [[displacement pressure]] of the fracture [[porosity]] in the seal. ...cks, so it is easier for petroleum to invade the fractures than the matrix porosity. In fact, many fractured rocks with open fractures have apertures so wide t
  3 KB (478 words) - 17:09, 1 February 2022
• Buckles plot
  A Buckles plot is a plot of water saturation (S_w) vs. [[porosity]]. Contours of equal bulk volume water (BVW) are drawn on the plot.
  1 KB (183 words) - 18:19, 26 March 2015
• Carbonate facies
  * [[Predicting carbonate porosity and permeability]] * [[Basics of carbonate porosity formation and preservation]]
  3 KB (433 words) - 18:32, 6 April 2022
• Reservoir system
  ...between different disciplines. Explorationists apply the term to mean a [[Porosity|porous]] and [[Permeability|permeable]] rock regardless of the fluid it con * A '''reservoir''' is a [[Porosity|porous]] and [[Permeability|permeable]] rock saturated with oil or gas in [
  4 KB (579 words) - 14:34, 1 April 2022
• China Shale Gas & Liquids - Sichuan Basin
  ...40m, an average TOC content of 2-4%, vitrinite reflectance (Ro) of 2-3.5%, porosity of 1.85-8.32%, and pressure coefficient of 1.3-2.1 (Zou et al., 2019; Guo e ...(Guo et al., 2020). In summary, for the high quality shale interval, high porosity provides abundant pore space for shale gas storage, and high brittleness ma
  7 KB (985 words) - 18:54, 4 December 2023
• Seismic data: analyzing individual reflectors
  * [[Porosity]] prediction ...within specific reflectors can give us clues to changes in lithology or [[porosity]].
  4 KB (481 words) - 18:20, 4 February 2022
• Forward modeling of seismic data
  ...lower interval velocity and lower density than the surrounding rock (see [[Porosity]]). ...ts from this modeling indicate that seismic data could be used to identify porosity in this geological setting. A good description of modeling methods and a nu
  10 KB (1,513 words) - 21:16, 19 January 2022
• Pore and pore throat sizes
  ...ide it. The cross-sectional shape of fluids moving through intergranular [[porosity]] is roughly circular. Both pores and pore throats can be divided into petr ...etrography and reservoir physics, 1: objective classification of reservoir porosity]: AAPG Bulletin, vol. 75, no. 10, p. 1547–1563.</ref> describe a procedur
  4 KB (516 words) - 14:04, 4 April 2022
• Sea level cycles and climate
  ...resmi1/data/a067/a067/0001/0150/0155.htm Eustatic and tectonic controls on porosity evolution beneath sequence-bounding unconformities and parasequence disconf ...s greater, carbonates are subject to greater dissolution; therefore, vuggy porosity and [http://wiki.seg.org/wiki/Dictionary:Karst karst] features are common.
  7 KB (894 words) - 20:54, 6 April 2022
• Reservoir
  ...at can accumulate hydrocarbons (oil or gas). Reservoir rock must have good porosity and permeability to accumulate and drain oil in economical quantities. ==Reservoir Porosity==
  14 KB (2,134 words) - 16:48, 26 March 2019
• Porosity
  | chapter = Porosity ...most all hydrocarbon reservoirs are composed of sedimentary rocks in which porosity values generally vary from 10 to 40% in sandstones and from 5 to 25% in car
  24 KB (3,450 words) - 19:09, 20 January 2022
• Sea level cycles and carbonate diagenesis
  ...s that occurs during the longer term third-order cycles. For example, if [[porosity]] is occluded early, then later diagenesis does not occur or is greatly red ...resmi1/data/a067/a067/0001/0150/0155.htm Eustatic and tectonic controls on porosity evolution beneath sequence-bounding unconformities and parasequence disconf
  7 KB (960 words) - 21:00, 6 April 2022
• Core description
  ...and wireline log calibration. Core plugs provide samples for analysis of [[porosity]], [[permeability]], fluid saturation, and a host of compositional and text ...sedimentary structures are depicted graphically as accurately as possible. Porosity amounts in percent can be scaled as needed. (Modified from Casey.<ref name=
  13 KB (1,786 words) - 20:50, 19 January 2022
• Standard interpretation
  ...e response of the various logging devices. To interpret the response for [[porosity]] or saturation, the volume of shale must be determined. * Determine the porosity. [[Porosity]] is the fraction of the total rock available for the storage of fluids.
  25 KB (3,776 words) - 19:53, 18 January 2022
• Petrophysical analysis of Sorrento field wells
  ...y-and-performance_fig9-90.png|Figure 1]]. Sandstone descriptors found on [[porosity]] logs are as follows: Wells 8 and 1 both are interpreted as encountering transition zones, based on porosity types and log-calculated saturations. Well 8 encountered the Morrow just ab
  7 KB (956 words) - 17:24, 11 April 2022
• Midale water saturation and pore geometry
  ...burn well. The hyperbolic curves represent equal values of S_w × porosity (Φ). Points from the same pore type that fall along a hyperbolic curve are * [[Midale porosity, pore geometries, and petrophysics]]
  4 KB (588 words) - 17:01, 12 April 2022
• Displacement pressure estimation from pore size
  ....com/data/bulletns/1992-93/data/pg/0076/0002/0000/0191.htm Relationship of porosity and permeability to various parameters derived from mercury injection-capil ...g Research conference, unpublished abstract.</ref> Use of permeability and porosity is thwarted by the lack of a distinct apex in the mercury injection data of
  5 KB (766 words) - 22:55, 2 February 2016
• Rock physics analysis for reservoir identification
  ...velocities, and moduli as a function of composition, diagenetic processes, porosity, and fluid content. Such analysis is commonly carried out to discriminate b ...Gurevich, B., 2007, Fluid substitution in shaley sediment using effective porosity: Geophysics, v. 72, no. 3, p. O1-O8.</ref> The result of fluid substitution
  15 KB (2,356 words) - 18:00, 26 April 2022
• Rock quality
  ....com/data/bulletns/1992-93/data/pg/0076/0002/0000/0191.htm Relationship of porosity to permeability to various parameters derived from mercury injection–capi ...t think that flow unit 1 is higher quality because it has three times more porosity and the same permeability as flow unit 2. However, in terms of fluid flow e
  10 KB (1,534 words) - 16:53, 4 April 2022
• Water saturation distribution in a reservoir
  Bulk volume water (BVW) equals [[porosity]] (Φ) × S_w. In zones with the same pore type and geometry, BVW A [[Buckles plot]] is a plot of S_w vs. porosity. Contours of equal BVW are drawn on the plot.
  5 KB (687 words) - 17:09, 5 April 2022
• Midale lithofacies and distribution
  ...-and-performance_fig9-102.png|{{figure number|4}}Crossplot of routine core porosity and permeability from Midale in an example well at Weyburn field. From Coal ...The brick pattern denotes packstone facies with vuggy and intergranular [[porosity]]; hachures indicate porous dolomitic mudstone facies. Log and core data fo
  6 KB (842 words) - 18:50, 4 December 2023

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