Studies of near-seabed data sets show that salt tectonics controls the distribution and architecture of deep-water reservoirs in many salt-influenced basins. It is typically difficult, however, to study the distribution and stratigraphic evolution of depositional systems preserved at deeper, economically significant depths, reflecting poor seismic imaging of steeply dipping strata flanking high-relief salt structures. Three-dimensional seismic and borehole data from the Santos Basin, offshore Brazil, allow us to identify a range of depositional elements that form the building blocks of three main tectono-stratigraphic phases. During the first phase, channel systems and lobes were confined within updip minibasins and to the hanging walls of salt-detached faults. During the second phase, channel systems and lobes filled updip minibasins leading to sediment bypass, with coarse clastic deposition then occurring in downdip minibasins, >100 km from the coeval shelf margin. Syndepositional seafloor relief caused (1) channel system deflection and diversion around salt-cored highs, (2) channel system uplift and rotation on the flanks of rising salt structures, and (3) lateral and frontal confinement of channel systems. During the final phase, rising salt walls dissected previously deposited deep-water systems, with mass-transport complexes deposition becoming increasingly important. Our results have important implications for postsalt prospectivity in the Santos Basin and other salt-influenced sedimentary basins, with a range of reservoirs and trapping styles present in this underexplored interval. More specifically, we show that large volumes of clastic sediment were not trapped behind the “Albian gap,” a salt-controlled depocenter dominating the northwestern basin margin, but were instead delivered farther basinward.

中文翻译：

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巴西近海桑托斯盆地受盐影响斜坡上的深水储层分布

对近海床数据集的研究表明，在许多受盐影响的盆地中，盐构造控制着深水储层的分布和结构。然而，通常很难研究保存在更深、具有经济意义的深度的沉积系统的分布和地层演化，这反映了高起伏盐结构侧翼陡倾地层的地震成像不佳。来自巴西近海桑托斯盆地的三维地震和钻孔数据使我们能够确定一系列沉积元素，这些元素构成了三个主要构造地层阶段的组成部分。在第一阶段，河道系统和裂片被限制在上倾小盆地内和脱盐断层的悬壁上。在第二阶段，通道系统和裂片填充了上倾小盆地，导致沉积物绕道，粗碎屑沉积然后发生在下倾小盆地中，距同期大陆架边缘 >100 公里。同沉积海底浮雕导致 (1) 盐芯高地周围的通道系统偏转和分流，(2) 盐结构上升侧翼的通道系统抬升和旋转，以及 (3) 通道系统的侧向和锋面限制。在最后阶段，上升的盐壁解剖了先前沉积的深水系统，质量传输复合物沉积变得越来越重要。我们的结果对桑托斯盆地和其他受盐影响的沉积盆地的盐后勘探具有重要意义，在这个未充分勘探的层段中存在一系列储层和圈闭方式。进一步来说，