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Anticlinal trap. An anticline is an area of the subsurface where the strata have been pushed into forming a domed shape. If there is a layer of impermeable rock present in this dome shape, then water-insoluble hydrocarbons can accumulate at the crest until the anticline is filled to the spill point (the highest point where hydrocarbons can escape the anticline).
In structural geology, an anticline is a type of fold that is an arch-like shape and has its oldest beds at its core, whereas a syncline is the inverse of an anticline. A typical anticline is convex up in which the hinge or crest is the location where the curvature is greatest, and the limbs are the sides of the fold that dip away from the hinge.
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English: A guide to some common symbols found on geologic maps. Includes strike and dip, vertical strata, horizontal strata, anticline axis, syncline axis, plunging anticline axis, plunging syncline axis, and strike-slip fault.
Formation of a river anticline by river erosion and the associated isostatic rebound. As the river erodes the overlying material, the underlying rocks will rebound up, like a block in water if you remove a weight from on top of it, forming an antiformal structure. (Image created by Michael Stevens)
GA Guide 22 Poynton Syncline: England E&W 98 Prees Syncline: England BGS:BRG 10; Toghill P. 2006; Plant, JA et al. 1999 Purbeck Anticline: Dorset England E&W 342/3 GA Guide 22 Purbeck Monocline: Dorset England E&W 342/3 Mem E&W 328etc Pwlldu Head Syncline Glamorgan Wales Brief expln to E&W 247, 2011 Pwllygranant Syncline: Wales E&W 193 Pyecombe ...
Anticlinal traps are formed by folding of rock. For example, if a porous sandstone unit covered with low permeability shale is folded into an anticline, it may form a hydrocarbons trap, oil accumulating in the crest of the fold. Most anticlinal traps are produced as a result of sideways pressure, folding the layers of rock, but can also occur ...
A petroleum trap. An irregularity (the trap ) in a layer of impermeable rocks (the seal ) retains upward-flowing petroleum, forming a reservoir. Petroleum or crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights, and other organic compounds, found in geologic formations ...