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• 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
• Petrophysical analysis of lithofacies
  ...lar petrophysical character (flow units) using log data and, if available, porosity-[[permeability]] data. Categorize each flow unit by port type as mega-, mac ...ons of the parasequences have poor reservoir characteristics, despite high porosity readings on the logs. Thus, the target of interest is the highstand mound f
  6 KB (763 words) - 18:53, 4 February 2022
• Tight gas reservoirs: evaluation
  ...-gas-reservoirs_fig3.png|{{figure number|3}}Histograms showing (a) average porosity values and (b) average permeability values for cored tight gas reservoir fa ...aracteristic of this type of reservoir is the nature and distribution of [[porosity]] and permeability (Table 1). The most common reason for the minimal permea
  11 KB (1,444 words) - 21:26, 4 January 2024
• Predicting carbonate porosity and permeability
  * [[Basics of carbonate porosity formation and preservation]]
  2 KB (251 words) - 18:32, 6 April 2022
• Migration rate calculation
  ! Porosity || Use * φ = free [[porosity]]
  4 KB (618 words) - 19:40, 14 February 2022
• Sandstone permeability estimation from cuttings
  # Describe the visible and pinpoint [[porosity]] and interconnectedness. * [[Sandstone porosity and permeability prediction]]
  6 KB (882 words) - 17:19, 6 April 2022
• Determining water saturation
  * [[Determining porosity from density-neutron logs]]
  2 KB (244 words) - 13:38, 5 April 2022
• Early carbonate diagenesis
  ...=Purser_1978>Purser, B. H., 1978, Early diagenesis and the preservation of porosity in Jurassic limestones: Journal of Petroleum Geology, v. 1, no. 2, p. 83-94 ...s. In the undersaturated zone, solution occurs, creating moldic or vuggy [[porosity]]. In the active saturated freshwater phreatic zone extensive and rapid cem
  10 KB (1,352 words) - 19:07, 6 April 2022
• Diagenetic traps: criteria for recognition
  * Secondary [[porosity]] present but not related to subaerial exposure (subsurface deep burial dis * Zones of secondary porosity interbedded with tight rock in a depositionally homogeneous facies
  5 KB (611 words) - 21:06, 4 February 2022
• Thin section analysis
  ...tional cores because petrographic observations can be compared directly to porosity and permeability measurements. ...ll pores. The epoxy is stained, usually blue, to facilitate observation of porosity once thin sections have been completed. Epoxy can also be “stained” wit
  24 KB (3,264 words) - 15:09, 24 January 2022
• Reservoir quality
  ...y types in sandstone and carbonate rocks are listed in Table 1 (also see [[Porosity]]). |+ {{table number|1}}Porosity types
  18 KB (2,514 words) - 17:47, 21 January 2022
• Carbonate diagenesis
  ...rporated into geological facies and/or diagenetic models in order to map [[porosity]], [[Interpreting Sw distribution in a reservoir| water saturation]], and [ ...agenetic processes that are initiated soon after deposition and by which [[Porosity#Carbonate pore systems|intergranular pore space]] is progressively reduced
  23 KB (3,026 words) - 20:48, 19 January 2022
• Predicting hydrocarbon recovery
  ...pore volume and [[water saturation]] (S_w). Reservoir size and [[porosity]] determine pore volume. Pore throat size (see [[Pore and pore throat sizes * Φ = porosity (decimal, not percent)
  5 KB (691 words) - 17:10, 5 April 2022
• Well log analysis for reservoir characterization
  # porosity (φ) ...shale volume calculation, calculate clay volume, permeability calculation, porosity calculation, wave velocity calculation, etc.
  25 KB (3,679 words) - 21:17, 13 March 2019
• Hydrocarbon accumulation: the seven critical elements
  * [[Porosity]] * Lateral [[permeability]] and [[porosity]]
  5 KB (636 words) - 21:47, 1 February 2022
• Micropermeable seal leakage
  ...[[fracture]]s are few or where fracture apertures are very small, fracture porosity may be invaded, but the leakage rate may be small.
  5 KB (742 words) - 17:11, 1 February 2022
• Reservoir engineering
  Porosity (Phi) 5, permeability (k) mD, fluid saturation (S) %, capiler pressure (Pc) ===Porosity===
  14 KB (2,122 words) - 17:33, 7 March 2016
• Borehole gravity
  ...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 ano ...yond this simple description to include detection of oil- and gas-filled [[porosity]] and detection and definition of remote structures, such as salt domes, fa
  10 KB (1,517 words) - 15:54, 20 January 2022
• Lithofacies analysis
  ...ck-look lithology from logs|well logs]] and outcrops. Annotate logs with [[porosity]] and [[permeability]] data (if available) from potential reservoir and sea
  2 KB (317 words) - 18:52, 4 February 2022
• Monte Carlo and stochastic simulation methods
  For example, the input variables might be porosity (&phi;), oil saturation (S₀), and a binary indicator (I) set equ ...iables. For example, the joint spatial distribution of the three variables porosity, oil saturation, and indicator of formation presence can be modeled by thre
  11 KB (1,623 words) - 19:24, 19 January 2022
• Haynesville and Bossier Shales (Upper Jurassic), East Texas and Northwest Louisiana
  ...ch Bossier reservoirs are characterized by overpressure (0.9 psi/ft), high porosity averaging 8–12%, low Sw of 20–30%, nano-darcy permeabilities, reservoir ...higher percent weight of total organic content (TOC), higher average total porosity and higher original gas in place (OGIP; Fig. 4); however, increasing permit
  4 KB (628 words) - 23:05, 3 March 2022
• Relationship between porosity and permeability on fractured basement reservoir
  ...y, rock is fractured can be categorized into 3 type geologically, based on porosity system : ...ation. However, the reservoir problem does not include both of the another porosity system types. Porous of matrix from a formation that has fracture matrix, u
  29 KB (4,601 words) - 16:09, 12 April 2016
• Open hole tools
  * '''Storage capacity''' of the formation, which normally includes [[porosity]] and fluid saturations ...'lithology and porosity'' devices are used to determine both lithology and porosity. A variety of ''auxiliary'' tools are used to make special logging measurem
  23 KB (3,350 words) - 17:26, 18 January 2022
• Fracture analysis
  * Natural fracture intensity prediction and, to a limited extent, fracture [[porosity]], given assumptions regarding rock behavior and [[Wikipedia:Deformation_(m * Prediction of fracture porosity, given assumptions regarding relationships between stress and strain and th
  5 KB (644 words) - 15:30, 3 February 2022
• Saturations required for hydrocarbon flow
  Other experiments, including lower [[porosity]] rocks, indicate much higher oil saturations of 25–91% may be required.<
  2 KB (313 words) - 13:57, 1 April 2022
• Sorrento field: water saturation
  ...name=ch09r42>Patchett, J., G., Coalson, E., B., 1982, The determination of porosity in sandstone and shaly sandstone, part 2: effects of complex mineralogy and ...by brine during testing. Saturation exponents were less than 2 in the best porosity type. This implies the reservoir is somewhat shaly. However, ''n'' was assu
  7 KB (1,044 words) - 16:57, 13 April 2022
• Mudlogging: the mudlog
  This track gives a relative indication of rock strength and [[porosity]]. Track 1 includes the following information: ...-mudlog_fig2.png|Figure 2]], a separate column is included for qualitative porosity estimation.
  5 KB (752 words) - 15:39, 24 January 2022
• Capillary pressure (Pc) curves: pore throat size determination
  ...to equilibrium, the volume of injected mercury is measured (V2). Since the porosity of the test sample is known prior to the test, the volume of injected mercu
  6 KB (898 words) - 16:21, 4 April 2022
• Pay determination
  * [[Basic open hole tools|Well logs]], including measures of the lithology, [[porosity]], and fluid saturation ...sis (porosity, [[permeability]], fluid saturation), wireline log analysis (porosity, fluid saturation)
  13 KB (1,799 words) - 19:01, 20 January 2022
• Weyburn seal capacity
  ...pear to be a seal at all. Instead, it consists of rocks with appreciable [[porosity]], local oil staining, local log-calculated water saturations less than 100 ....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
  10 KB (1,484 words) - 20:55, 4 December 2023
• Borehole gravity: uses, advantages, and disadvantages
  * Evaluating reservoir [[porosity]], especially in carbonate reservoirs where other tools are not as reliable
  3 KB (351 words) - 15:11, 31 January 2022

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