国际能源署估计非欧佩克成员国内的成熟油田产量每年将自然下降11%。
The IEA estimates that the output from mature fields outside OPEC would naturally drop by about 11% a year.
西非项目与阿布扎比项目产量提高被成熟油田产量下降以及所有权与撤资影响部分抵消。
Higher production from projects in West Africa and increased volumes in Abu Dhabi were partly offset by mature field decline, and the impact of entitlements and divestments.
这些公司乐于从命：随着国内油田达到成熟期，它们提升利润水平的最佳途径就是海外扩张。
The companies were happy to oblige: with domestic fields maturing, their best route to increased profits was to expand their businesses overseas.
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