Hydrocarbon evaluation analysis is based on different level research, such as basin analysis, sedimentary sequence analysis, and petroleum system analysis.

油气盆地、沉积层序与油气系统的研究属于不同层次的油气资源评价的基础研究。

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The projections and deployments of petroleum exploration in Yuanjiang sag are restricted by lacking of research on sequence stratigraphy and depositional system.

由于缺乏系统的沉积与层序地层研究，这在很大程度上制约了沅江凹陷油气勘探的总体规划和部署。

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