巴西亚马逊盆地石油地质特征及勘探前景分析

南美洲巴西亚马逊盆地为一狭长形的简单内克拉通多旋回沉积盆地，走向NEE，基底为前寒武系结晶岩，其上发育古—新生界地层。确定盆地内古生界发育了主力成藏组合：志留系、泥盆系发育主力生油岩，具有极好的生烃能力，泥盆系、石炭系发育较好的砂岩储集层，盖层主要为古生界内发育的黑色页岩、钙质页岩及膏岩。研究认为，盆地内部隆起及中部断裂带为油气运聚提供了有效通道和聚集场所，初步明确了盆地内油气运移的主力方向，对亚马逊盆地油气资源潜力进行了分析，指出了油气勘探的有利区带，为亚马逊盆地下一步油气勘探提供了依据。

PETROLEUM GEOLOGIC PROPERTY AND EXPLORATION POTENTIAL OF AMAZON BASIN IN BRAZIL

The Amazon Basin is located in the interior part of northeast Brazil.It is an NEE trending elongate intracratonic basin，the basement is composed of Precambrian crystalline rocks，above the basement，paleozoic to cenozoic formations develop.The main play is developed in the Paleozoic.It is identified that the main source rocks are marine black shales which were deposited in the Devonian and the Silurian，which have excellent hydrocarbon generation potential.Carboniferous and Devonian sandstones provide the main reservoirs，and the seals are provided by the intraformational shales of the Paleozoic formations.Then，the upheaval of the basin and the fault zone provide the effective channel and the accumulation zone of the petroleum.Meanwhile，the main reasonable hydrocarbon direction in the basin is studied，and a more favorable exploration area and more scientific exploration strategy in Amazon Basin are determined.