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 [[Natural gas|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, [[fracture]]d 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