中国西北含油气盆地前陆冲断带的构造特征

我国西部的诸多中新生代含油气盆地周缘广泛发育前陆冲断带。在综合研究了大量地质和地球物理资料的基础上，指出这些冲断带可以划分出两大类和四个亚类，它们分别为基底卷入的单凹陷型和多凹陷型；盖层滑脱的多层次滑脱型和简单滑脱型。基底卷入型的构造变形表现为冲面陡倾，断裂长期活动，形成浅层被动构造，变形带狭窄；盖层滑脱型的构造变形则表现为断层倾角缓，冲断前锋类型复杂，活动时间短和变形带宽等特点。对不同类型的冲断

Structural Characteristics of Foreland Thrust Belts in Sedimentary Basins of Northwestern China

Foreland thrust belts are developed extensively in the margin of Meso Cenozoic sedimentary basins in northwestern China.With geologic and geophysic data,the belts are grouped into basement involved and caprock decollement types, and into 4 sub types of single or multi sags and multilayer or simple slip.The basement involved tectonics show a steep thrust fault face,a long active stage and a narrow deformation zone,resulting in shallow passive structures.The caprock decollement tectonics have contrary characteristics with the basement involved ones.Various structural styles in the thrust belts are discussed.