In 2007, according to Petroleum Intelligence Weekly, 70% of world oil production was controlled by national oil companies.
2007年，根据石油情报周刊，世界70%的石油生产被国有石油公司控制。
2
Each company controlledoil rights to particular shares of land in the oil fields and paid into the pipeline construction fund according to the size of its holdings.
每个公司都控制着油田中一定土地上的开采权，并由股份的比例把资金投入到管道建设中。
3
About 73% of the world's conventional oil reserves are controlled by national oil companies that don't allow any equity participation by foreign oil companies, ConocoPhillips told analysts.