A recent USGS open file report entitled Ranking of the World's Oil and Gas Provinces by Known Petroleum Volumes groups the worlds 937 geologic provinces into eight regions by known petroleum volumes of field. This site succintly describes the ranking methods used and results of the study. Perhaps not surprisingly, the Middle East and North Africa was found to contain nearly twice as many billions...

The World Energy Project's Website holds a wide collection of data including province assessment reports and maps showing geology, oil and gas fields, and geologic provinces (Africa, Arabian Peninsula, South Asia, South America, Former Soviet Union, Asia Pacific Region, and Iran). Finally, a report ranks the world's oil and gas provinces by known petroleum volumes.