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...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 ...Deep diagenetic processes can be both fabric selective (fluid flow through interparticle or intercrystalline pores) or nonfabric selective (compaction).

...y'''. In most cases, water saturation (S_w) of rocks with Archie porosity can be predicted from log analysis using the [[Archie equation]] * Φ = [[porosity]]

...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

!Intergranular/interparticle || Intercrystalline || Clay cemented || Vuggy || Fracture * [[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

...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

==Relation between subsurface diagenesis with porosity changing== ===Increase of porosity===

...y types in sandstone and carbonate rocks are listed in Table 1 (also see [[Porosity]]). |+ {{table number|1}}Porosity types

...voirs. The uncertainty in the determination of water saturation, effective porosity, net pay, and permeability will impact the estimation of in-place volumes a ...006, [http://archives.datapages.com/data/bulletns/2006/01jan/0091/0091.HTM Porosity-permeability relationships in interlayered limestone-dolostone reservoirs]:

...n these sectors show the best reservoir characteristics (averages: TOC 5%; porosity 12%; clay 10%–20%; water saturation 20%), the most adequate geomechanical ...9.jpeg|Figure 9]]). Because thick units with high TOC (and associated high porosity) are fundamental elements for a landing zone, the proximal bottomsets and t

...ply points, (3) water column energy level, and (4) rock properties such as porosity and permeability. Grain size is a commonly used attribute in descriptions a