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介绍了流体势（主要是水势和气势）的计算方法，具体分析了莺—琼盆地流体势在剖面上和平面上的分布特点，以揭示莺—琼盆地的油气运移、聚集规律。研究结果认为：油气是从高势区向低势区运移的，并在位于油气运移路径上的低势圈闭中聚集成藏，因而低势区是油气藏形成的有利区块。据此，预测莺—琼盆地内的下第三系陵水组有六个低势区，并结合烃源、储集层、盖层及圈闭等地质条件，对它们分别给予了评价。进而指出：位于①号断裂上升盘的崖１３—１低凸起、崖２１—１低凸起带、中央凹陷、崖南凹陷等低势区为今后油气勘探的有利区块。
The calculation methods of fluid potential (mainly water potential and momentum) are introduced. The distribution characteristics of fluid potential in the Ying - Qiong basin on the profile and in plane are analyzed in detail to reveal the law of hydrocarbon migration and accumulation in Ying - Qiong basin. The results show that oil and gas migrate from the high-potential area to the low-potential area and accumulate in the low-potential traps located in the hydrocarbon migration path. Therefore, the low-potential area is a favorable block for oil and gas reservoir formation. Therefore, it is predicted that there are six low potential areas in the Lower Third Member of the Ying-Qiong Basin in the Lower Triassic, and they are respectively evaluated according to the geological conditions such as hydrocarbon source, reservoir, cap rock and traps. Furthermore, it is pointed out that the low-lying areas such as Ya 13-1 low ridge, Ya 21-1 low raised belt, central depression and Yalin Sag located at ① rising fault plate are the favorable blocks for future oil and gas exploration.