Difference between Upstream,Midstream and Downstream in oil and gas

Upstream oil and gas operations identify deposits, drill wells and recover raw materials from underground.
Upstream = Petroluem (crude oil/gas) exploration and prodcution activities.

Midstream operations link the upstream and downstream entities. Midstream operations mostly include resource transportation and storage, such as pipelines and gathering systems. 

Midstream = Processing/refining of Petroleum e.g refineries etc
Downstream operations include refineries and marketing. These services turn crude oil into usable products such as gasoline, fuel oils and petroleum-based products. 

 Downstream = Distribution/marketing/sale of Petroleum products 

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