巴西海上坎波斯与桑托斯盆地油气成藏特征对比研究

Petroleum accumulation characteristics in Campos and Santos Basins, offshore Brazil

熊利平 邬长武 郭永强 李嵩阳

Xiong Liping Wu Changwu Guo Yongqiang Li Songyang

中国石油化工股份有限公司 石油勘探开发研究院, 北京 100083 2. 北京邮电大学, 北京 100876

Petroleum Exploration & Production Research Institute of SINOPEC, Beijing 100083, China 2. Beijing University of Posts and Telecommunications, Beijing 100876, China

坎波斯与桑托斯盆地油气资源非常丰富。2个盆地均经历了裂谷、过渡、被动大陆边缘3个构造阶段,发育盐下陆相层序、盐岩层序、盐上海相层序,形成盐下、盐上2套成藏组合。由于盆地构造格架不同,导致盐岩分布、盐下储层发育程度的差异,加之盐上储层分布的不同,造成2个盆地油气分布特征的巨大差异。桑托斯盆地油气主要分布在外部高地带的盐下领域,而坎波斯盆地油气主要富集在中部低凸带的盐上储层中。通过分析2个盆地的构造演化及地层发育特征、成藏条件及主控因素,优选了盐下、盐上成藏组合的有利区,剖析了2个盆地成藏条件的异同,可指导我国石油公司在这2个盆地新项目评价和在执行区块的勘探部署。

The Campos and Santos Basins are rich in petroleum. Both of the 2 basins have experienced 3 phases of tectonic evolution (rift, transition and passive continental margin), depositing 3 corresponding sedimentary mega-sequences (pre-salt continental sequence, salt sequence and post-salt marine sequence), and forming 2 plays (pre-salt play and post-salt play). Due to different tectonic frameworks, salt distribution and pre-salt reservoir development patterns are different in the 2 basins. Combining with different post-salt reservoir distribution, obvious difference exists in petroleum distribution between the 2 basins. Petroleum in the Santos Basin mainly distributes in pre-salt sequences of the outer basement plateau while petroleum in the Campos Basin accumulates in post-salt reservoirs of the central low uplift. Based on the analyses of tectonic evolution, sedimentation characteristics and major controlling factors, the favorable exploration zones for pre-and post-salt reservoirs are defined. The differences of accumulation condition between the 2 basins are discussed. The studies may provide Chinese companies a guide for new business development and executing blocks' exploration activities in the 2 basins.

中国石化科技部项目"巴西重点盆地油气资源潜力及选区评价"(P11063)。

https://doi.org/10.11781/sysydz201304419