Three-dimensional seismic interpretation in the Ulleung Basin reveals the relationship between large-scale mass transport deposits and overlying seismic chimney structures. In the study area, we divide the sedimentary successions correlated to the Plio-Quaternary into three units. Unit-I is interpreted as a large-scale mass transport deposit translated to the north, laterally subdivided into a translation zone and lateral shear zone. The translation zone includes groove marks, Basal shear surface, slump folds, longitudinal shear lines, and tilted blocks, while the lateral shear zone exhibits a pop-up and thrust fault system associated with transpressional stress resulting from the translation of the mass. Unit-II and Unit-III are interpreted as deposits of hemipelagic and turbidite sediments. The seismic chimneys are mainly observed in Unit-II and Unit-III, genetically classified into two types: (1) sediment-remobilized type and (2) fracture-induced type. The sediment-remobilized type predominantly occurs in Pliocene sediments, spatially coinciding with kinematic indicators in the translation zone. The fracture-induced type mainly develops in Pleistocene to Holocene sediments, concentrated above deep-seated faults, pop-up faults, and longitudinal shear lines. Thus we assert that the kinematic indicators inside the large-scale mass transport deposit are responsible for confined migration pathways for fluid and gas. Furthermore, in the sedimentary succession, the base of the gas hydrate stability zone appears above the mass transport deposit, and the overlying seismic chimneys are filled with gas hydrates. We suggest that gas hydrate dissociation controlled by sea level fall, regional uplift, and subsequent deposition is an additional driving force for vertical fluid migration inside the large-scale mass transport deposit in the Ulleung Basin.

郁陵盆地三维地震解释揭示了大规模物质输送沉积物与上覆地震烟囱结构之间的关系。在研究区，我们将与Plio-第四纪相关的沉积序列分为三个单元。 Unit-I被解释为向北平移的大规模物质运输沉积物，横向细分为平移带和横向剪切带。平移带包括凹槽痕迹、基底剪切面、塌落褶皱、纵向剪切线和倾斜块体，而横向剪切带则表现出与质量平移产生的压应力相关的弹出和逆冲断层系统。 Unit-II 和 Unit-III 被解释为半远洋沉积物和浊积沉积物。地震烟囱主要分布在II单元和III单元，从成因上可分为两类：（1）沉积物再活动型和（2）断裂诱发型。沉积物再活化类型主要出现在上新世沉积物中，在空间上与平移带的运动学指标一致。裂缝诱发型主要发育于更新世至全新世沉积物中，集中在深部断层、弹出断层和纵切线上方。因此，我们断言大规模传质沉积物内部的运动学指标是限制流体和气体迁移路径的原因。此外，在沉积层序中，天然气水合物稳定带的底部出现在传质沉积物上方，上覆的地震烟囱充满了天然气水合物。我们认为，海平面下降、区域抬升和随后的沉积控制的天然气水合物解离是郁陵盆地大规模质量输送沉积物内垂直流体运移的额外驱动力。