石油和天然气的密度都比水小，所以二者通常会浮在被水浸泡的岩石和沉积物的表层。
Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.
如果把水饱和的沉积物或岩石样品放在合适的干燥的地方，样品中的大部分水将从中流出。
Much of the water in a sample of water-saturated sediment or rock will drain from it if the sample is put in a suitable dry place.
沉积岩——地表附近最常见的岩石类型——也是最常见的储水层，因为它们可以装水的空间最多。
Sedimentary rocks—the most common rock type near the surface—are also the most common reservoirs for water because they contain the most space that can be filled with water.
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