济阳坳陷碎屑岩断裂带结构特征及演化模式
Structural Characteristics and Evolution Mode of Debris Rock Fault Zone in Jiyang Depression

通过野外断裂带露头解剖、岩心精细观察描述等手段，结合测井资料、地震资料对济阳坳陷断裂带结构类型与特征、断裂带结构演化规律开展了研究。结果表明，研究区断裂带结构包括滑动破碎带和诱导裂缝带两个结构单元。滑动破碎带位于断裂带核部，主要由断层角砾岩组成，也发育断层泥，角砾棱角明显，大小混杂，呈松散破碎或固结状态；诱导裂缝带位于滑动破碎带两侧，主要发育裂缝或者变形带等微构造，保留母岩的基本特征，一般上盘诱导裂缝带裂缝发育明显好于下盘诱导裂缝带；断裂带结构演化受断距控制，随着断距的增大，断裂带结构由一元型“诱导裂缝带”向三元型“上盘诱导裂缝带 + 滑动破碎带 + 下盘诱导裂缝带”演化。
According to field and core observation of fault zones, combined with logging data and seismic data, the structural types and characteristics, structural evolution of fault zone in Jiyang Depres-sion are studied. Brittle faults are mainly classified into two structural domains; a central core and its enveloping damage zones, which can be distinguished from the surrounding wall rock containing background deformation. The fault core generally consists of a number of recurring slip surfaces and fault rocks such as gouges, cataclasites, and breccias. Damage zones are characterized by relatively low strain and less intense deformation compared to the fault core, and these zones generally exhibit several second-order structures such as subsidiary faults and fractures. Generally, the fracture development of hanging wall is better than that of foot wall. The evolution of the fracture zone structure is controlled by displacement. With the increase of displacement, the fracture zone structure evolves from single “induced fracture zone” to ternary “upper disc induced fracture zone + sliding fracture zone + lower disc induced fracture zone”.