Reservoir Oil

Definition - What does Reservoir Oil mean?

Reservoir Oil is a hydrocarbon fluid which has been accumulated over a long period of time in a porous, permeable and sedimentary rock. The most common reservoir rocks are sandstone and limestone. Fractured granite also contains hydrocarbons even though it is not a sedimentary rock. A typical oil reservoir contains oil, gas and water. Gas being the lightest occupies the upper part, oil occupies the middle space while water occupies the lower space in the reservoir.

Petropedia explains Reservoir Oil

In an oil reservoir, hydrocarbons and water are denoted by various colors which are globally accepted, and all E&P organizations use same color coding to represent them.

  • Oil is represented by green
  • Gas is represented by red
  • Water is represented by blue

A Reservoir can be broadly classified as:

  • Oil Reservoir – In this type of reservoir, majority of the hydrocarbons are crude oil and water with little or no amount of natural gas.
  • Gas Reservoir – This type of reservoir contains only natural gas and water.
  • Condensate Reservoir – This type of reservoir contains natural gas liquids or gas condensates along with natural gas. As the pressure drops below the dew point, the condensate separates from natural gas.
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