Global Crude Oil Reserves: Country-Level Data and Annual Trends
This dataset tracks crude oil reserves across major oil-holding countries from 2021 to 2025. It provides reserve volumes in both million and billion barrels, together with annual changes and year-over-year percentage movements, making it easier to compare countries and identify changes in reported reserve levels over time.
The underlying figures primarily represent proven or proved crude oil reserves, meaning quantities considered commercially recoverable under the reporting standards used by the respective source. Changes in reported reserves may result from new discoveries, field reassessments, production depletion, improved recovery techniques, economic conditions, or revisions to national reserve estimates.
The dataset primarily follows the OPEC Annual Statistical Bulletin series, with official national or EIA sources used for validation where country-level figures are not directly visible in OPEC’s public tables. Reserve definitions can vary between sources, particularly for countries such as Canada where some datasets include oil sands. These differences are documented in the methodology rather than mixed without explanation.