Research on the characteristics of faults and their evolutionary history since the Cretaceous in the Suhongtu-Dagu depressions can provide a theoretical basis for geological evaluation of the coal seams in the Suhongtu Formation in the northern-central region of the Yin’e Basin. Using 3-D seismic-logging inversion techniques, seismic stratigraphic calibration, stratigraphic sequence delineation, and thickness calculations on the Suhongtu-Dagu depressions were carried out to clarify the planar and profile distributions of the faults, as well as the evolutionary history of these faults and the tectonic history of the depressions. The results of this study revealed that the distribution of the faults in the Suhongtu-Dagu depressions in the northern part of the Yin’e Basin varies with region, and the fault system was multi-period, orthotopic, north-east-trending, and north-north-east-trending, with a certain degree of inheritance in terms of the geological setting. Three types of faults were identified: Y-shaped fractures, reverse Y-shaped fractures, and parallel fractures, which can be classified as Paleozoic Cenozoic continuous syncline faults and intra-depression faults from the top of the Permian to the Upper Cretaceous series and inter-stratigraphic adjustment faults within the Cretaceous System, respectively. The evolution of these faults can be divided into three phases: the controlling faults were the faults that existed before the Early Cretaceous and had been active since then; synclinal faults that formed during the Early Cretaceous; and modified faults that formed since the Early Cretaceous. The development and modification of the coal seams in the Cretaceous Suhongtu Formation in the Hari, Kuanzihu, and Babei sags were strongly controlled and influenced by a multi-phase complex fault system.

研究苏红图—大沽坳陷白垩纪以来断裂特征及其演化历史，可为银额盆地中北部地区苏红图组煤层地质评价提供理论依据。利用三维地震测井反演技术，对苏红图-大沽凹陷进行地震地层标定、地层层序圈定和厚度计算，明确了断层的平面和剖面展布及断层的演化历史和洼地的构造历史。研究结果表明，银额盆地北部苏红图—大沽凹陷断裂分布区域不同，断裂系多期、同位、北东向、北北东向，在地质背景上具有一定的继承性。识别出Y形断裂、反Y形断裂和平行断裂3种类型，可划分为古生代、新生代连续向斜断层和二叠系顶部至上白垩统及间的坳陷内断层。 -分别为白垩纪系统内的地层调整断层。这些断裂的演化可分为三个阶段：控制断裂是早白垩世以前存在并一直活跃的断裂；早白垩世形成的向斜断层；以及自早白垩世以来形成的改良断层。