Upstream refers to the oil and gas industry segment involving exploration, drilling, and production activities. This sector includes finding hydrocarbon reserves, developing oil and gas fields, and extracting crude oil and natural gas from underground reservoirs. Upstream operations represent the initial stage of the energy supply chain.

Upstream companies face significant capital requirements, geological risks, and long development timelines before generating revenue. Investment decisions depend on commodity price expectations, reserve quality, and extraction costs. Understanding upstream economics helps assess energy sector investments and long-term supply fundamentals.

Real-world example: ExxonMobil’s upstream division spends $15 billion annually on exploration and production activities, discovering new reserves and developing existing fields to maintain oil and gas production capacity.