Our Insights blog presents deep data-driven analysis and visual content on important global issues from the expert data team at Knoema.了解更多
Quick data summaries and visualizations on trending industry, political, and socioeconomic topics from Knoema’s database.United States: Higher Education Costs Flat in 2018 E-Commerce Prompting Innovation by Traditional Postal Services The Global Opportunity Index 2018 了解更多
Proved energy reserves are estimated quantities of energy sources that analysis of geologic and engineering data demonstrates with reasonable certainty are recoverable under existing economic and operating conditions. The location, quantity, and grade of the energy source are usually considered to be well established in such reserves. This term is equivalent to "Measured reserves" as defined in the resource/reserve classification contained in the U.S. Geological Survey Circular 831, 1980. Measured and indicated reserves, when combined, constitute demonstrated reserves.
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