Buarque Bruno V, Barbosa José A, Oliveira Jefferson T C, Magalhães José R G, Correia Osvaldo J
Universidade Federal de Pernambuco/UFPE, Departamento de Geologia, LAGESE, Avenida Prof. Moraes Rego, 1235, Cidade Universitária, 50740-530 Recife, PE, Brazil.
An Acad Bras Cienc. 2017 Apr-Jun;89(2):841-857. doi: 10.1590/0001-3765201720160544.
The Pernambuco Basin represents one of the most prominent regions for deep water oil and gas exploration off the Brazilian coast. This study aims to identify and describe the occurrence of carbonate buildups in the offshore regions of the basin. The study was based on an analysis of a set of 143 2D time-migrated seismic sections that cover the offshore region of the Pernambuco Basin. An interpretation of the seismic dataset was used to define the main seismic sequences related to the main regional pulses of deposition and to identify three main groups of carbonate buildups: 1) shelf margin reefs, 2) patch reefs, and 3) isolated carbonate buildups. The carbonate buildups formed in two main intervals during post-rift sequences of the Santonian-Maastrichtian and Paleocene-Middle Miocene, which extend the known periods of carbonate deposit formation in the basin. The formation of carbonate buildups was controlled by the tectonic evolution of the Pernambuco Plateau, which created a series of paleotopographic highs that enabled the establishment of oceanographically and climatically favorable conditions for carbonate formation and deposition. These findings are important for understanding the evolution of the basin and for future evaluations of its petroleum potential.
伯南布哥盆地是巴西海岸外深水油气勘探最显著的地区之一。本研究旨在识别和描述该盆地近海区域碳酸盐岩建造的情况。该研究基于对一组覆盖伯南布哥盆地近海区域的143条二维时间偏移地震剖面的分析。利用地震数据集的解释来确定与主要区域沉积脉冲相关的主要地震层序，并识别出碳酸盐岩建造的三个主要类别：1）陆架边缘礁，2）斑礁，以及3）孤立的碳酸盐岩建造。碳酸盐岩建造形成于桑托阶-马斯特里赫特阶和古新世-中中新世裂后层序的两个主要间隔期，这延长了该盆地已知的碳酸盐岩沉积形成时期。碳酸盐岩建造的形成受伯南布哥高原构造演化的控制，该演化造就了一系列古地形高地，为碳酸盐岩的形成和沉积创造了海洋学和气候上有利的条件。这些发现对于理解该盆地的演化以及未来评估其石油潜力具有重要意义。
