Difference between revisions of "Pore systems"
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| part = Predicting the occurrence of oil and gas traps | | part = Predicting the occurrence of oil and gas traps | ||
| chapter = Predicting reservoir system quality and performance | | chapter = Predicting reservoir system quality and performance | ||
| − | | frompg = 9- | + | | frompg = 9-22 |
| − | | topg = 9- | + | | topg = 9-22 |
| author = Dan J. Hartmann, Edward A. Beaumont | | author = Dan J. Hartmann, Edward A. Beaumont | ||
| link = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm | | link = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm | ||
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Rocks can be classified on the basis of their pore geometry into four major pore categories that can be divided into ten subcategories. Extensive experience and laboratory analysis show that these pore type categories have a particular behavior when interacting with fluids that can be used to predict the behavior of reservoir systems over time. | Rocks can be classified on the basis of their pore geometry into four major pore categories that can be divided into ten subcategories. Extensive experience and laboratory analysis show that these pore type categories have a particular behavior when interacting with fluids that can be used to predict the behavior of reservoir systems over time. | ||
| − | Pore geometry is categorized as intergranular, intercrystalline, | + | Pore geometry is categorized as intergranular, intercrystalline, [[vug]]gy/moldic, or [[fracture]]. [[Pore and pore throat sizes|Pore throat sizes]] are categorized into mega-, macro-, meso-, and micro-pore types. Combining both pore geometry and pore type into a classification scheme is an effective method of describing pore systems. For example, a very fine-grained [[sandston]]e might be classified as having intergranular mesoporosity or a [[limestone]] as having vuggy macroporosity. |
Table 1 describes a typical rock type for each pore type in the classification. | Table 1 describes a typical rock type for each pore type in the classification. | ||
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|- | |- | ||
|- | |- | ||
| − | !rowspan=2|Pore geometry/ | + | !rowspan=2|Pore geometry/pore type || colspan=3|Archie || colspan=2|Non-Archie |
|- | |- | ||
!Intergranular/interparticle || Intercrystalline || Clay cemented || Vuggy || Fracture | !Intergranular/interparticle || Intercrystalline || Clay cemented || Vuggy || Fracture | ||
|- | |- | ||
| − | |Mega/macro || Clean, coarse sandstone or carbonate grainstone || | + | |Mega/macro || Clean, coarse sandstone or [[carbonate]] [[grainstone]] || |
*Coarsely crystalline carbonate | *Coarsely crystalline carbonate | ||
| − | *Quartz- or carbonate-cemented coarse sandstone | + | *[[Quartz]]- or carbonate-cemented coarse sandstone |
| − | || Chlorite or illite cemented (pore lining) coarse sandstone || Connected vugs or vugs in a crystalline matrix || Fracture width >50µ | + | || [[Chlorite]]- or [[illite]]-cemented (pore-lining) coarse sandstone || Connected vugs or vugs in a crystalline matrix || Fracture width >50µ |
|- | |- | ||
| − | |Meso || Clean, coarse silt to very fine sandstone or carbonate grainstone || | + | |Meso || Clean, coarse [[silt]] to very fine sandstone or carbonate grainstone || |
*Very fine to medium crystalline carbonate | *Very fine to medium crystalline carbonate | ||
*Quartz- or carbonate-cemented fine to medium sandstone | *Quartz- or carbonate-cemented fine to medium sandstone | ||
|| | || | ||
| − | *Chlorite or illite cemented (pore lining) fine to medium sandstone | + | *Chlorite- or illite cemented (pore-lining) fine to medium sandstone |
| − | *Kaolinite cemented (pore filling) coarse sandstone | + | *[[Kaolinite]]-cemented (pore-filling) coarse sandstone |
| − | || Poorly connected vugs or | + | || Poorly connected vugs or [[oomold]]s in a fine to medium crystalline matrix || Fracture width 5-50µ |
|- | |- | ||
| − | |Micro || Clean clay-size to fine siltstone or clay-size carbonate || | + | |Micro || Clean [[clay]]-size to fine [[siltstone]] or clay-size carbonate || |
*Silt-size crystalline carbonate | *Silt-size crystalline carbonate | ||
*Quartz- or carbonate-cemented silt to very fine sandstone | *Quartz- or carbonate-cemented silt to very fine sandstone | ||
| − | || Sandstone with clay in pore throats || | + | || Sandstone with clay in pore throats || Dispersed vugs in microcrystalline matrix || Fracture width <5µ |
|} | |} | ||
==See also== | ==See also== | ||
| Line 51: | Line 51: | ||
* [[Pore system shapes]] | * [[Pore system shapes]] | ||
* [[Pore and pore throat sizes]] | * [[Pore and pore throat sizes]] | ||
| − | * [[ | + | * [[Pore throat size and connectivity]] |
| − | * [[ | + | * [[Capillary pressure (Pc) curves: pore throat size determination]] |
| + | * [[Porosity]] | ||
==External links== | ==External links== | ||
| Line 61: | Line 62: | ||
[[Category:Predicting the occurrence of oil and gas traps]] | [[Category:Predicting the occurrence of oil and gas traps]] | ||
[[Category:Predicting reservoir system quality and performance]] | [[Category:Predicting reservoir system quality and performance]] | ||
| + | [[Category:Treatise Handbook 3]] | ||
Latest revision as of 13:52, 4 April 2022
| Exploring for Oil and Gas Traps | |
| |
| Series | Treatise in Petroleum Geology |
|---|---|
| Part | Predicting the occurrence of oil and gas traps |
| Chapter | Predicting reservoir system quality and performance |
| Author | Dan J. Hartmann, Edward A. Beaumont |
| Link | Web page |
| Store | AAPG Store |
Rocks can be classified on the basis of their pore geometry into four major pore categories that can be divided into ten subcategories. Extensive experience and laboratory analysis show that these pore type categories have a particular behavior when interacting with fluids that can be used to predict the behavior of reservoir systems over time.
Pore geometry is categorized as intergranular, intercrystalline, vuggy/moldic, or fracture. Pore throat sizes are categorized into mega-, macro-, meso-, and micro-pore types. Combining both pore geometry and pore type into a classification scheme is an effective method of describing pore systems. For example, a very fine-grained sandstone might be classified as having intergranular mesoporosity or a limestone as having vuggy macroporosity.
Table 1 describes a typical rock type for each pore type in the classification.
| Pore geometry/pore type | Archie | Non-Archie | |||
|---|---|---|---|---|---|
| Intergranular/interparticle | Intercrystalline | Clay cemented | Vuggy | Fracture | |
| Mega/macro | Clean, coarse sandstone or carbonate grainstone |
|
Chlorite- or illite-cemented (pore-lining) coarse sandstone | Connected vugs or vugs in a crystalline matrix | Fracture width >50µ |
| Meso | Clean, coarse silt to very fine sandstone or carbonate grainstone |
|
|
Poorly connected vugs or oomolds in a fine to medium crystalline matrix | Fracture width 5-50µ |
| Micro | Clean clay-size to fine siltstone or clay-size carbonate |
|
Sandstone with clay in pore throats | Dispersed vugs in microcrystalline matrix | Fracture width <5µ |
See also
- Pore system fundamentals
- Pore system shapes
- Pore and pore throat sizes
- Pore throat size and connectivity
- Capillary pressure (Pc) curves: pore throat size determination
- Porosity
External links
| find literature about Pore systems |
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