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| '''System:''' [[Stratigraphic trap]]s | | '''System:''' [[Stratigraphic trap]]s |
− | | + | :'''Regime:''' Diagenetic traps |
− | * '''Regime:''' Diagenetic traps
| + | ::'''Class:''' Diagenetic reservoirs |
− | | + | ::Form where [[porosity]] is created as a result of local diagenetic processes such as dissolution or dolomitization. |
− | <list-item>'''Class:''' Diagenetic reservoirs</list-item><list-item>Form where [[porosity]] is created as a result of local diagenetic processes such as dissolution or dolomitization.
| + | :::'''Subclass:''' Secondary dolomite reservoirs |
− | | + | :::Form as a result of localized secondary dolomitization. |
− | <list-item>'''Subclass:''' Secondary dolomite reservoirs</list-item><list-item>Form as a result of localized secondary dolomitization.</list-item><list-item>'''Subclass:''' Leached (secondary) porosity</list-item><list-item>Form as a result of localized leaching of nonreservoir-quality rock to create enhanced porosity and [[permeability]]. Common beneath unconformity surfaces.</list-item></list-item><list-item>'''Class:''' Diagenetic seals</list-item><list-item>Trap boundaries created by plugging original reservoir porosity and permeability by diagenetic cements or minerals.
| + | :::'''Subclass:''' Leached (secondary) porosity |
− | | + | :::Form as a result of localized leaching of nonreservoir-quality rock to create enhanced porosity and [[permeability]]. Common beneath unconformity surfaces. |
− | <list-item>'''Subclass:''' Secondary anhydrite barriers</list-item><list-item>Form as a result of secondary anhydrite precipitating in original pore spaces.</list-item><list-item>'''Subclass:''' Secondary clay barriers</list-item><list-item>Form as a result of secondary clay, commonly kaolinite, precipitating in original pore space.
| + | ::'''Class:''' Diagenetic seals |
− | | + | ::Trap boundaries created by plugging original reservoir porosity and permeability by diagenetic cements or minerals. |
− | <list-item>'''Style:''' Secondary pore-throat trap</list-item><list-item>Caused by a reduction in the size of pore-throat radii of reservoir rocks by depositional or diagenetic processes. These trap types typically have relatively porous units in the sealing facies that are impermeable to oil [[migration]] due to capillary restraints but contain producible water.</list-item></list-item></list-item>
| + | :::'''Subclass:''' Secondary anhydrite barriers |
| + | :::Form as a result of secondary anhydrite precipitating in original pore spaces. |
| + | :::'''Subclass:''' Secondary clay barriers |
| + | :::Form as a result of secondary clay, commonly kaolinite, precipitating in original pore space. |
| + | ::::'''Style:''' Secondary pore-throat trap |
| + | ::::Caused by a reduction in the size of pore-throat radii of reservoir rocks by depositional or diagenetic processes. These trap types typically have relatively porous units in the sealing facies that are impermeable to oil [[migration]] due to capillary restraints but contain producible water. |
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| ==Discussion of diagenetic trap families== | | ==Discussion of diagenetic trap families== |