海底钻井平台将寻找石油的区域延伸到了海洋大陆架——大陆边缘那些平缓倾斜的海底区域。
Offshore drilling platforms extend the search for oil to the ocean's continental shelves—those gently sloping submarine regions at the edges of the continents.
两家公司还成立合作项目共同开发位于俄罗斯北极大陆架的石油和天然气。
The pair also set up a venture to explore oil and gas deposits beneath Russia's Arctic shelf.
石油主要蕴藏在西北地区，其次为东北、华北地区和东部沿海浅海大陆架。
Petroleum reserves are mainly in northwest and also in northeast China, north China and the continental shelves in east China.
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