History and Background:
The oil and gas industry is involved in the exploration, production (upstream), transportation (midstream), and refining and marketing (downstream) of crude oil and natural gas. It's a global, capital-intensive, and historically cyclical industry with significant geopolitical influence.
Key sub-sectors:
- Upstream (Exploration & Production - E&P): Finding and extracting crude oil and natural gas.
- Integrated Majors: Large companies involved in all stages (e.g., ExxonMobil, Shell, BP, Chevron, TotalEnergies). Often have significant downstream and chemical operations.
- Independent E&Ps: Focus primarily on exploration and production. Vary greatly in size and geographic focus.
- National Oil Companies (NOCs): State-owned entities that control vast reserves (e.g., Saudi Aramco, PetroChina, Gazprom).
- Midstream: Transporting, storing, and processing oil and gas.
- Pipelines (oil, natural gas, NGLs - Natural Gas Liquids).
- Gathering and processing facilities.
- Storage facilities (tanks, underground caverns).
- Liquefied Natural Gas (LNG) terminals (liquefaction and regasification).
- Often structured as Master Limited Partnerships (MLPs) in the U.S. for tax efficiency, though some have converted to C-corps.
- Downstream (Refining & Marketing - R&M): Refining crude oil into petroleum products and marketing these products.
- Refineries.
- Gasoline service stations, fuel distribution networks.
- Petrochemicals (often integrated with refining).
- Oilfield Services & Equipment: Provide drilling services, equipment, and technical expertise to E&P companies.
- Drilling contractors (onshore, offshore rigs).
- Pressure pumping, well completion services.
- Seismic and reservoir analysis.
- Equipment manufacturing.
Commodity prices (crude oil - WTI, Brent; natural gas - Henry Hub, TTF) are the primary driver of industry profitability, particularly for the upstream segment.