maturing of petroleum

例句：

1. 1.The oil matures in the ground for several years before it can be extracted.
   石油在地下成熟数年后才能被提取。
2. 2. The maturity of the oil is closely related to its quality and price.
   石油的成熟度与其质量和价格密切相关。
3. 3. The maturity of the oil reserves is a key factor in determining future production levels.
   石油储备的成熟度是决定未来生产水平的关键因素。