Changes

  | part    = Traps, trap types, and the petroleum system

  | part    = Traps, trap types, and the petroleum system

  | chapter = Classification of exploration traps

  | chapter = Classification of exploration traps

  | frompg  = 2-1

  | frompg  = 2-5

  | topg    = 2-42

  | topg    = 2-6

  | author  = Richard R. Vincelette, Edward A. Beaumont, Norman H. Foster

  | author  = Richard R. Vincelette, Edward A. Beaumont, Norman H. Foster

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch02/ch02.htm

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch02/ch02.htm

==Trapping elements==

==Trapping elements==

Three main trapping elements comprise every subsurface hydrocarbon accumulation:

Three main trapping elements comprise every subsurface hydrocarbon [[accumulation]]:

* '''Trap reservoir'''—storage for accumulating hydrocarbons and can transmit hydrocarbons.

* '''Trap reservoir'''—storage for accumulating hydrocarbons and can transmit hydrocarbons.

==Trap boundaries==

==Trap boundaries==

Trap boundaries define the limits of the trap and usually consist of (1) boundaries between solids, such as the contact between reservoir and seal, or (2) boundaries between fluids, such as oil–water or gas–water contacts. Temperature can also control a trap boundary as displayed by gas hydrate traps.

Trap boundaries define the limits of the trap and usually consist of (1) boundaries between solids, such as the contact between reservoir and seal, or (2) boundaries between fluids, such as oil–water or gas–water contacts. Temperature can also control a trap boundary as displayed by [http://www.oilgae.com/ref/glos/gas_hydrates.html gas hydrate] traps. See [[Gas hydrates]].)

==Traps vs. accumulations==

==Traps vs. accumulations==

==Capillary contrasts==

==Capillary contrasts==

Capillary contrasts are differences in the capillary properties of the pore-throat apertures of seal and reservoir rocks, generally caused by a difference in pore-throat aperture sizes. These capillarity contrasts commonly create the trap boundaries between reservoir and seal.

[[Capillary pressure|Capillary contrasts]] are differences in the capillary properties of the pore-throat apertures of [[seal]] and [[reservoir]] rocks, generally caused by a difference in [[Pore systems|pore-throat aperture sizes]]. These capillarity contrasts commonly create the trap boundaries between reservoir and seal.

==Trap closure==

==Trap closure==

Trap closure is a measure of the potential storage capacity or size of the trap defined by the trap boundaries. Vertical closure is a measure of the maximum potential hydrocarbon column of the trap. Areal closure is a measure of the maximum area of the potential hydrocarbon accumulation within the trap boundaries. Volumetric closure integrates vertical and areal closure with pay thickness, [[porosity]], and hydrocarbon saturation to provide the volume of the potential hydrocarbon accumulation within the trap boundaries.

Trap [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=closure closure] is a measure of the potential storage capacity or size of the trap defined by the trap boundaries. Vertical closure is a measure of the maximum potential [[hydrocarbon column]] of the trap. Areal closure is a measure of the maximum area of the potential hydrocarbon accumulation within the trap boundaries. Volumetric closure integrates vertical and areal closure with pay thickness, [[porosity]], and [[Water saturation|hydrocarbon saturation]] to provide the volume of the potential hydrocarbon accumulation within the trap boundaries.

==Trap classification==

==Trap classification==

[[Category:Traps, trap types, and the petroleum system]]  

[[Category:Traps, trap types, and the petroleum system]]  

[[Category:Classification of exploration traps]]

[[Category:Classification of exploration traps]]