桑托斯盆地裂谷期构造演化对碳酸盐岩沉积的控制作用

为了研究桑托斯盆地不同构造背景下碳酸盐的沉积模式,对桑托斯盆地圣保罗台地的裂谷期构造演化、沉积充填特征、断裂特征及其对下白垩统碳酸盐岩沉积的控制作用进行了分析,得到基底的断裂、局部沉降及抬升活动是该地区构造演化的主控因素的结论。根据研究区内构造演化不同阶段的沉积特征,建立了圣保罗台地两种构造背景下的碳酸盐岩沉积模式:发育在裂谷晚期和坳陷期的孤立碳酸盐台地,发育在坳陷期的碳酸盐滩-礁复合沉积。对该区盐下油气勘探及储层预测具有重要意义。

The Control Of Tectonic Evolution In Rift Stage On The Deposition Of Carbonate In Santos Basin

For the analysis of carbonate deposition model in different tectonic styles, this study focuses on the tectonic evolution, sediment infilling, faulting character and lower Cretaceous carbonate deposition during rift stage, in S?o Paulo Plateau of Santos basin. Basement faults, local subsidence and rising were considered as main factor that controlled the tectonic evolution in study area. Based on the deposition character in different stages of tectonic evolution in study area, two types of carbonate depositional models are built: the first type is isolate carbonate platform, which developed on the basement highs during late rift and sage stages. The second type is the reefs-shoal complex deposition on the gentle slopes, which were formed during sag stage by plastic basement subsidence in early rift stage, and basement rising, fault blocks rolling followed in late rift stage. Both are significant for the exploration activities and reservoir studies.