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相对于海相盆地层序,陆相盆地层序构型具有多样性特征.迁移型层序是陆相断陷湖盆演化过程中一种特殊的层序构型,研究相对较少.通过珠江口盆地珠Ⅰ坳陷惠州凹陷、恩平凹陷古近系文昌组层序迁移现象的分析,定义了迁移型层序的概念,划分出“自迁移”和“异迁移”两种迁移型层序类型.自迁移型层序是由低角度正断层的水平滑动造成,即由同一条同沉积边界断裂控制;异迁移型层序由盆地两侧同沉积控边断裂活动强度及先后期次造成,即由两条同沉积边界断裂控制.迁移型层序在侧向迁移过程中,不同级次的层序地层单元控制下的储层、烃源岩也发生侧向迁移、斜列叠置,更利于生、储、盖等油气成藏要素的有效配置,形成多区块、多层段油气藏组合.
Compared with the marine basin sequences, the sequence stratigraphy of continental basins has a diversity of features. Migration sequence is a special sequence in the evolution of terrestrial faulted lakes, but relatively few studies have been done. The analysis of the sequence migration of the Wenchang Formation in the Paleogene Wenchang Formation in the Zhu Ⅰ Depression of the Zhujiang Basin in the basin and the definition of the migration type sequence define the two kinds of migration of “self-migration ” and “different migration ” Type sequence.The self-migrating sequence is caused by the horizontal sliding of the low-angle normal fault, that is, it is controlled by the same same-sedimentary boundary fault.The sequence of the isochronous sequence is controlled by the intensity of the active edge of the sedimentary edge controlled by both sides of the basin, Which is controlled by the two same sedimentary boundary faults.During the lateral migration of migration-type sequences, the reservoirs and source rocks under different levels of sequence stratigraphy units also migrate laterally, Set, more conducive to students, reservoirs, covers and other oil and gas accumulation elements of effective allocation, the formation of multi-block, multi-layer reservoir combination.