The analysis and interpretation of the Dachaidan area, Qaidam Basin, is difficult, owing to the co-location of two groups of thrust faults (N–E faults and N–W faults) there and the area’s complicated structural deformation history. To address this problem, field geological investigation, seismic study, well logging, and drilling data were used to identify the key fault systems and their distribution patterns through the area. By integrating surface and subsurface structural features and seismic and non-seismic data, we carried out studies using structural modeling and analysis of the Dachaidan area. Study results identified two systems of thrust faults (N–W faults and W–E faults). We found that these faults could be categorized into three systems: a basin-margin thrust system, an intro-basin thrust system, and an intro-basin compression and strike-slip fault system. These systems showed different features in different areas and zones. We also constructed interpretation models of different deformation mechanisms in the basin and on basin margins. Three tectonic systems (compression, extension, and strike-slip) were identified, which were further divided into eight structural domains. We also established structure coexistence and distribution patterns. The overall structural character of the area was summarized as the northern and southern parts belonging to different zones, with the western and eastern parts belonging to different systems. By analyzing the SW–NE tectonic evolution sections, we defined the back-propagation structural evolution sequences of thrust nappes (on the basin margin or in the basin) and back-thrust structures (in the basin) as well as their influence on the residual Mesozoic strata.

中文翻译：

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青藏高原东北部柴达木盆地北缘山前带构造模拟及演化

由于柴达木盆地大柴旦地区有两组逆冲断层（N-E 断层和N-W 断层）并存，且该地区构造变形历史复杂，因此对柴达木盆地大柴旦地区的分析解释十分困难。为了解决这个问题，现场地质调查、地震研究、测井和钻井数据被用来识别该地区的关键断层系统及其分布模式。通过整合地表和地下结构特征以及地震和非地震数据，我们利用大柴旦地区的结构建模和分析进行了研究。研究结果确定了两个逆冲断层系统（N-W 断层和 W-E 断层）。我们发现这些断层可以分为三个系统：盆地边缘逆冲系统、盆地内逆冲系统、盆地内压缩走滑断层系统。这些系统在不同的区域和区域表现出不同的特征。我们还构建了盆地和盆地边缘不同变形机制的解释模型。确定了三个构造系统（压缩、伸展和走滑），并将其进一步划分为八个构造域。我们还建立了结构共存和分布模式。该区的整体构造特征概括为北、南分属不同地带，西、东分属不同体系。通过分析 SW-NE 构造演化剖面，