海安凹陷位于苏北盆地东南部,受多条二级断层的分割,凹陷呈现多次凹的构造格局,导致油气资源平面分布比较分散,油气藏规模较小。次凹斜坡和隆起带等正向构造背景控制油气聚集,断层控藏作用显著。由于断层活动期早于油气大规模运聚时期,且主力储层泰州组一段又为厚层泥岩覆盖,致使凹陷内的油气主要沿泰州组一段储层发生侧向运移并聚集成藏。 Hai’an Sag is located in the southeast of the Northern Jiangsu Basin. It is divided by multiple second-level faults, and the depression has multiple concave structural patterns, resulting in a relatively flat distribution of oil and gas resources and a small scale of reservoirs. The positive tectonic setting of sub-concave slope and uplift zone controls the accumulation of oil and gas, and the fault control and storage have a significant effect. Since the active phase of the fault was earlier than the period of large-scale oil and gas migration and accumulation, the first member of the Taizhou Formation of the main reservoir was covered by thick mudstone, causing the oil and gas in the sag to migrate laterally along the reservoir of the first Taizhou Formation and accumulate into reservoir.