It also takes longer to educate and train new contributors to now-mature fields.

而且如今需要用更多的时间来教育和培训一个在日趋成熟的领域的科学家。

youdao

The IEA estimates that the output from mature fields outside OPEC would naturally drop by about 11% a year.

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%。

youdao

It is also selling some mature oil and gas fields in the North Sea and Nigeria.

该公司还将出售在北海和尼日利亚的部分成熟油气田。

youdao

Same for Siberia, which has most of Russia's production, but from mature fields.

FORBES: Reserves

However, we believe that there are pockets of growth which the firm could leverage such as mature fields and global unconventional plays.

FORBES: Halliburton Earnings Preview: Offshore Growth In Focus

This strategy, of ramping up investment in mature fields, is the same one he has applied through the other four big shelf acquisitions Exxi has made since its founding in 2005.

FORBES: Energy XXI Doubles In Size With $1 Billion Exxon Acquisition