Investigating the timing, structural style, and development of multiphase extensional fault systems is essential for understanding rift basin evolution and for assessment of structural trap integrity. Borehole-controlled interpretation and analysis of two-dimensional and three-dimensional seismic data sets from the eastern Dampier subbasin indicate that a northeast-trending basement weakness zone was subjected to west-northwest–east-southeast oblique extension in the latest Triassic–late Middle Jurassic, resulting in systematic segmentation of the Rosemary fault system (RFS). Temporal stress change during Cretaceous north-south extension produced complex fault systems along the RFS, including (1) east-west–trending isolated faults with maximum displacement close to their center; (2) east-west–trending abutting faults, which initially nucleated as isolated faults, later abutted against the main structure, showing large displacement accruement on the composite fault; and (3) northeast-southwest–trending splay faults characterized by systematic left-stepping segmentation, with maximum displacement occurring at the point where the splay faults deviate from the main structure. In the Miocene, the RFS was locally reactivated by northwest-southeast compression in the northeastern part of the fault system, developing a compressive fault-propagation fold at the upper tip of the inverted extensional fault. This study suggests that the style of basin boundary fault reactivation depends largely on preexisting structures and temporal stress changes. The fault reactivation style is also a significant factor in influencing basin architecture, sediment distribution, fault linkage processes, and petroleum basin prospectivity.

中文翻译：

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澳大利亚西北大陆架东丹皮尔盆地的边界断层系统的多相活化

研究多相伸展断层系统的时机，构造样式和发展对于了解裂谷盆地的演化和评估构造圈闭的完整性至关重要。东部Dampier子盆地的二维和三维地震数据集的钻孔控制解释和分析表明，东北向的基底弱化带在最新的三叠纪-晚期中部经历了西北-西北-东-东南斜向伸展侏罗纪，导致罗斯玛丽断层系统（RFS）的系统分割。白垩纪南北向伸展过程中的时间应力变化沿RFS产生了复杂的断层系统，包括（1）东西向的孤立断层，其最大位移接近中心。（2）东西走向的邻接断层，最初成核为孤立断层，后来紧靠主体结构，显示出复合断层上的大位移。（3）东北-西南走向的伸展断层，其特征是系统的左步分段，最大位移发生在伸展断层偏离主构造的位置。在中新世，RFS通过断层系统东北部的西南-东南压缩局部激活，在倒转伸展断层的上端形成了一个压缩的断层传播褶皱。这项研究表明，盆地边界断层复活的方式在很大程度上取决于既有的构造和时间应力变化。断层活化方式也是影响盆地构造，沉积物分布，