10,370
edits
Changes
Jump to navigation
Jump to search
Line 20:
Line 20: + + + + + + + + + + + + +
→Classes and subclasses
==Classes and subclasses==
==Classes and subclasses==
Three trap classes have been identified, based on the geometry of the reservoir beds in contact with the unconformity surface. The hierarchical structure and definitions are shown below.
Three trap classes have been identified, based on the geometry of the reservoir beds in contact with the unconformity surface. The hierarchical structure and definitions are shown below.
{| class=wikitable
|-
! System || Regime || Class || Subclass
|-
| rowspan = 4 | Stratigraphic traps || rowspan = 4 | Erosional traps; Form as a result of erosional processes || rowspan = 2 | Truncation traps; Up-dip reservoir boundary created by truncation of a reservoir beneath an unconformity, followed by deposition of sealing unit on top of an unconformity. The unconformity surface provides top seal, but closure usually requires the presence of depositional or tectonic side and bottom seals beneath the unconformity. || Regional subcrop; Uniformly or gently dipping reservoir bed beneath an unconformity. Top seal is provided by postunconformity beds; bottom seal is provided by sealing units beneath reservoir.
|-
| Paleostructural subcrop; Folded and/or faulted reservoir beds beneath postdeformation unconformity. Reservoir distribution and trap boundaries are controlled by preunconformity deformation and subsequent erosion.
|-
| rowspan = 2 | Erosional relief traps; Closure provided by topographic relief beneath an unconformity. || Buried hill; Top-seal closure created by positive erosional relief of reservoir beneath a sealing unconformity surface.
|-
| Truncation edge; Side seal provided by truncation of a reservoir against later erosional valley, channel, or gorge wall and subsequent deposition of sealing beds in valley, channel, or gorge.
|}
'''System:''' [[Stratigraphic trap]]s
'''System:''' [[Stratigraphic trap]]s