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该区沙三亚段是典型的盐湖相沉积,岩盐厚度大、纯度高、分布广。由于基底断块的不均衡升降活动,导致含盐地层有不同的埋藏深度。在差异压实力作用下,塑性岩盐顺层向构造高部位流动和局部集中,进而因盐体拱张导致上覆地层弯曲变形和张裂形成盐丘和盐背斜。其后的盐上覆盖层团引张而发生断陷并使盐背斜复杂化。由此形成的各种盐流构造为以后的油气聚集提供了多种类型的圈闭,使文留地区在全凹陷中含油气丰度最高。
The Sanshya section of this area is a typical salt lake facies sedimentary. The thickness of rock salt is large, with high purity and wide distribution. Due to the unbalanced movements of basement blocks, saltous formations have different burial depths. Under the action of differential compaction force, the plastic rock salt flowed to the high structural part and concentrated locally, and then the salt formations and salt anticline formed by bending and deformation of the overburden due to the salt body arching. Subsequent salt overlying layers expand and lead to faults and salt anticlines. The various salt flow structures thus formed provide various types of traps for subsequent oil and gas accumulation, resulting in the highest abundance of oil and gas in the whole depression in the Wenliu area.