Almost every company, job title and piece of equipment in oil and gas belongs to one of three sectors. The labels describe where in the supply chain the work happens, using the metaphor of a river: upstream is near the source, downstream is near the consumer, and midstream is everything that connects them.
Upstream = exploration & production (E&P). Midstream = gathering, processing, transportation and storage. Downstream = refining, marketing and distribution. A barrel of oil passes through all three before it becomes gasoline in a car.
The three sectors at a glance
| Sector | Core activity | Examples |
|---|---|---|
| Upstream | Find and produce oil & gas | Seismic surveys, leasing, drilling, completion, wellsite production |
| Midstream | Move and process raw production | Gathering lines, gas plants, trunk pipelines, tankers, storage, LNG |
| Downstream | Refine and sell finished products | Refineries, fuel marketing, retail gas stations, petrochemicals |
Upstream
Upstream — also called exploration and production (E&P) — covers everything before the oil or gas leaves the ground: geological surveys, leasing mineral rights, drilling, well completion and early wellsite processing. It carries the highest geological risk because a company may spend millions drilling a well that turns out to be dry.
Midstream
Midstream is the link between production and refining. It gathers raw output from many scattered wells through small pipelines, processes it (separating pipeline-quality gas, natural gas liquids and stabilized crude), and transports it over long distances by trunk pipeline, tanker, rail and barge. Storage tanks and LNG terminals also sit in this sector.
Downstream
Downstream takes crude and raw gas and turns them into the products people actually buy. Refineries convert crude into gasoline, diesel, jet fuel, kerosene, heating oil, lubricants and asphalt; those products are then marketed and distributed to consumers and industry.
Why the distinction matters
The split shapes how the industry is organized. Companies often specialize in one sector — a small E&P operator may never own a pipeline, and a refiner may never drill a well. Each sector has its own risks, economics and regulators. "Integrated" majors like ExxonMobil or Shell operate across all three, capturing margin at every stage. For a worker or investor, knowing which sector a company sits in tells you a great deal about how it makes money and what moves its profits.
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Frequently asked
Drilling is an upstream activity. It is part of exploration and production, alongside seismic surveys, leasing, well completion and wellsite production.
Midstream moves and processes raw production — gathering, gas processing, pipelines, storage and LNG. Downstream refines that production into finished fuels and chemicals and sells them to consumers.
An integrated company operates across all three sectors — upstream, midstream and downstream — so it captures margin from the wellhead all the way to the retail pump.