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→Classes
==Classes==
==Classes==
The hierarchical structure and definitions for diagenetic traps are shown below.
The hierarchical structure and definitions for diagenetic traps are shown below.
{| class=wikitable
|-
! System || Regime || Class || Subclass || Style
|-
| rowspan = 4 | Stratigraphic traps || rowspan = 4 | Diagenetic traps || rowspan = 2 | Diagenetic reservoirs; Form where porosity is created as a result of local diagenetic processes such as dissolution or dolomitization. || colspan = 2 | Secondary dolomite reservoirs; Form as a result of localized secondary dolomitization.
|-
| colspan = 2 | Leached (secondary) porosity: Form as a result of localized leaching of nonreservoir-quality rock to create enhanced porosity and permeability. Common beneath unconformity surfaces.
|-
| rowspan = 2 | Diagenetic seals: Trap boundaries created by plugging original reservoir porosity and permeability by diagenetic cements or minerals. || colspan = 2 | Secondary anhydrite barriers; Form as a result of secondary anhydrite precipitating in original pore spaces.
|-
| Secondary clay barriers; Form as a result of secondary clay, commonly kaolinite, precipitating in original pore space. || 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.
|}
'''System:''' [[Stratigraphic trap]]s
'''System:''' [[Stratigraphic trap]]s