【摘要】 基于地震和钻井资料，在分析研究区沙河街组断层、古地貌等特征的基础上，对沧东凹陷沙河街期构造演化特征进行了分析，结合区域动力学背景探讨了沧东凹陷沙河街组的形成动力机制。结果表明，沧东凹陷主要存在平面状、铲状、座椅状和坡坪状4种断层剖面类型，断层剖面组合样式为“Y”型、断阶型、“人”字型和花状构造，断层平面组合特征为雁列状、“羽”状和侧列状。沙河街组不同沉积时期古地貌特征差异较大，总体表现出沉降中心由带状分布转化为面状分布，各构造单元趋于稳定沉积的地貌特征。盆地在沙河街期经历了强烈断陷期（沙三段沉积期）、断陷萎缩期（沙二段沉积期）和断拗期（沙一段沉积期） 3个演化阶段。沙三段-沙二段沉积期主要受地幔柱作用导致的伸展作用影响，沙一段沉积期主要受地幔柱作用导致的热沉降作用影响。更多还原

【Abstract】 Based on seismic and drilling data, this paper analyzes the tectonic evolution characteristics of the Shahejie Formation in the Cangdong Depression based on the analysis of the faults and paleogeomorphology of the Shahejie Formation. It discusses the dynamic mechanism of the formation of the Shahejie Period in the Cangdong Depression in combination with the regional dynamic background. The results show that there are four main types of fault profiles in Cangdong Depression, namely planar,shovel-shaped, seat-shaped and slope-shaped; four fault profile combination styles of "Y" shape, fault step type, "human" shape and flower-shaped structure, and three fault plane combination characteristics of goose column shape, "feather" shape and lateral row shape. The paleogeomorphological characteristics of the Shahejie Formation vary significantly in different sedimentary periods and generally show that the subsidence center is transformed from a zonal distribution to a planar distribution, and each tectonic unit tends to be stable. In the Shahejie Formation, the basin has experienced three evolutionary stages: intense fault depression（Es₃ sedimentary period）, fault depression compression（Es₂ sedimentary period） and fault depression period（Es₁sedimentary period）. The Es₃-Es₂ are mainly affected by the extensional effect caused by mantle plume, and the Es₁ is primarily influenced by the thermal subsidence caused by mantle plume.更多还原