Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.
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。
Steranes and terpanes exist in saturated hydrocarbon component of oil and source rock, and they are usually identified by gas chromatogram-mass spectrum.
甾萜类化合物存在于原油和生油岩的饱和烃组分中，通常用色谱-质谱法鉴定。
The gas cap pools, mainly distributed in Paleogene, are formed by spillover of undissolved gas in high saturated oil pools.
气顶气藏主要分布在下第三系，是在高饱和油藏的基础上，由于不能溶解于石油中的天然气的溢出而形成。
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