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。
The gas cap pools, mainly distributed in Paleogene, are formed by spillover of undissolved gas in high saturated oil pools.
结果表明绕丁坝的近场流动具有强三维非恒定特性，表现在坝后振荡回流区的形成和坝顶表面波的生成。
The observed information shows that the flow is three dimensional and unsteady due to the fluctuating circulation zone and surface wave.
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