Hydraulic-driven faults and fractures are important subsurface fluid-flow pathways, yet their seismic expressions are poorly documented. This paper uses high-quality three-dimensional seismic data to investigate curved, strata-bound domino-style faults above which a pockmark field is observed and interpreted to be associated with their formation. The faulted interval covers an area of 24 km2 and is ∼100 m thick. Faults show a concentric pattern with an average spacing of 120 m, whereas their throws approach 10 ms two-way time. Strata-bound domino faults were formed because of overpressure buildup and release in a mud-dominated succession, with their geometry responding to the local dip of the salt-withdrawal basin in which they occur. Further overpressure buildup resulted primarily from fluid migration through underlying crestal faults and secondarily through capillary permeability within permeable strata. Apart from the strata-bound domino faults and associated pockmark fields, other randomly distributed pockmarks indicate episodic fluid flow in the study area. Random pockmarks were likely formed during rapid burial of continental slope strata, resulting in the elevation of fluid pressure in underlying soft sediment. This paper concludes that strata-bound domino faults are a typical feature of fluid flow on salt-rich continental margins, such as southeastern Brazil, the Gulf of Mexico, and the western African continental margin. During their formation, strata-bound domino faults form significant conduits for migrating fluid into soft, porous strata, away from regional and local structural traps.

中文翻译：

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Espírito Santo 盆地（巴西东南部）近海的局部地层多米诺断层：盐析盆地流体突然释放的案例

液压驱动的断层和裂缝是重要的地下流体流动通道，但它们的地震表现却鲜有记载。本文使用高质量的 3D 地震数据研究弯曲的地层多米诺骨牌式断层，在断层上方观察到麻点场，并解释为与其形成有关。断层层面积为 24 平方公里，厚度约为 100 米。断层呈同心圆状，平均间距为 120 m，而它们的双向时间接近 10 ms。由于以泥为主的序列中超压的积累和释放，形成了地层约束的多米诺断层，其几何形状响应于它们发生的吸盐盆地的局部倾角。进一步的超压积聚主要是由于流体通过下伏顶断层迁移，其次是通过渗透地层内的毛细管渗透率造成的。除了地层边界多米诺断层和相关麻点场外，其他随机分布的麻点表明研究区域内有间歇性流体流动。陆坡地层快速埋藏过程中可能会形成随机麻点，导致下伏软沉积物中流体压力升高。本文认为，地层多米诺断层是巴西东南部、墨西哥湾、非洲西部大陆边缘等富盐大陆边缘流体流动的典型特征。在它们的形成过程中，地层约束的多米诺断层形成了重要的通道，将流体运移到柔软的多孔地层中，