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Line 95: − • The presence or absence of lime mud.+ − • The abundance of grains.[j] + − • the presence of in situ organic binding + + − + − + − • Mudstone: a mud-supported rock with < 10% grains, and original components are not organically bounded together during deposition (Figure 13). + − • Wackestone: a mud-supported rock with > 10% grains, and original components are not organically bounded together during deposition (Figure 14). + − • Packstone: a grain-supported rock with lime mud presented, and original components are not organically bounded together during deposition (Figure 15). + − • Grainstone: a grain-supported rock with lime mud absent, and original components are not organically bounded together during deposition (Figure 16). + − • Boundstone: a rock with the presence of organic components bounded together during deposition. − • Crystalline: a rock with unrecognizable depositional texture (Figure 17). Line 130:
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Carbonate sedimentary rocks classification (view source)
Revision as of 21:29, 5 December 2023
, 21:29, 5 December 2023→Dunham Classification
===Dunham’s Criteria===
===Dunham’s Criteria===
Dunham classification system is based on three depositional textural features:
Dunham classification system is based on three depositional textural features:
* The presence or absence of lime mud.
* The abundance of grains.[j]
* The presence of in situ organic binding
===Dunham (1962) Classification===
===Dunham (1962) Classification===
[[File:GeoWikiWriteOff2021-Abdulwahab-Figure12.png|thumbnail|400px|{{Figure number|12}}Dunham classification system for carbonate rock (1962)]]
The original Dunham classification system composes of six classes summarized in Figure 12:
The original Dunham classification system composes of six classes summarized in Figure 12:
[[File:GeoWikiWriteOff2021-Abdulwahab-Figure12.png|thumbnail|Fig. 12 Dunham classification system for carbonate rock (1962) [12]]]
* [[Mudstone]]: a mud-supported rock with < 10% grains, and original components are not organically bounded together during deposition (Figure 13).
* Wackestone: a mud-supported rock with > 10% grains, and original components are not organically bounded together during deposition (Figure 14).
* Packstone: a grain-supported rock with lime mud presented, and original components are not organically bounded together during deposition (Figure 15).
* Grainstone: a grain-supported rock with lime mud absent, and original components are not organically bounded together during deposition (Figure 16).
* Boundstone: a rock with the presence of organic components bounded together during deposition.
* Crystalline: a rock with unrecognizable depositional texture (Figure 17).
===Extended Dunham Classification (1971)===
===Extended Dunham Classification (1971)===
Floatstones and bindstones are usually formed in medium-energy settings (below average wave base).
Floatstones and bindstones are usually formed in medium-energy settings (below average wave base).
Rudstones and framestones are usually formed in high-energy settings (above wave base).
Rudstones and framestones are usually formed in high-energy settings (above wave base).
Organically-bound rocks show good reservoir quality if the skeletal growth is interconnected.
Organically-bound rocks show good reservoir quality if the skeletal growth is interconnected.
==Gallery==
==Gallery==