Changes

==What is a petroleum system?==

==What is a petroleum system?==

A petroleum system encompasses a pod of active source rock and all genetically related oil and gas accumulations. It includes all the geologic elements and processes that are essential if an oil and gas [[accumulation]] is to exist.

A petroleum system encompasses a pod of active [[source rock]] and all genetically related oil and gas accumulations. It includes all the geologic elements and processes that are essential if an oil and gas [[accumulation]] is to exist.

'''Petroleum''' describes a compound that includes high concentrations of any of the following substances:

'''Petroleum''' describes a compound that includes high concentrations of any of the following substances:

* Thermal and biological hydrocarbon gas found in conventional reservoirs as well as in [[gas hydrates]], tight reservoirs, fractured shale, and coal

* Thermal and biological hydrocarbon gas found in conventional reservoirs as well as in [[gas hydrates]], tight reservoirs, [[fracture]]d shale, and coal

* Condensates

* Condensates

* Crude oils

* Crude oils

* Natural bitumen in reservoirs, generally in siliciclastic and carbonate rocks

* Natural bitumen in reservoirs, generally in [[Lithofacies and environmental analysis of clastic depositional systems|siliciclastic]] and [http://http://www.geologyrocks.co.uk/tutorials/introduction_to_carbonates carbonate] rocks

'''System''' describes the interdependent elements and processes that form the functional unit that creates hydrocarbon accumulations.

'''System''' describes the interdependent elements and processes that form the functional unit that creates hydrocarbon [[accumulation]]s.

==Elements and processes==

==Elements and processes==