南美洲油气地质特征及资源评价

通过对南美洲28个主要含油气盆地石油地质特征的系统梳理,全面总结了南美洲的油气地质特征:①发育两个时代、两种类型的烃源岩;②储层类型单一,油气集中赋存在白垩系和古近系-新近系两个层系中;③发育4种成藏模式,即西缘前陆盆地发育陡坡短距离垂向运移成藏模式和缓坡长距离侧向运移成藏模式、东缘被动陆缘盆地发育盐上"断层+盐刺穿"运移成藏模式和盐下"烃源岩内浊积砂体+潜山"运移成藏模式;④油气分布平面上呈两带展布、两中心富集的规律。同时,以成藏组合为基础评价单元完成了南美地区资源评价。预测南美洲待发现可采资源量约为214 065MMBOE。主要集中分布在东缘海上被动陆缘盆地群和西缘陆上前陆盆地群两个领域。东委内瑞拉盆地、马拉开波盆地、桑托斯盆地和坎波斯盆地是预测资源量较大的4个盆地。

Petroleum Geology and Resource Assessment in South America

The paper has comprehensively summarized the petroleum geological characteristics of South America through the systematic analysis of 28 main petroliferous basins in South America,which are ①development "two" times,"two types" of source rocks;② single reservoir type,oil gas concentrated in the Cretaceous and Tertiary reservoirs;③ developing four kinds of accumulation models,the western foreland basins developing steep short distance vertical migration accumulation model and slope distance lateral migration reservoir forming pattern;eastern continental passive margin basins developing of post salt "fault +salt diapir" migration pattern and pre salt "carbonate+bury hill" migration pattern;④ In plane,oil and gas mainly distributing in two belts distribution,concentrating in two centers.At the same time,the paper evaluates the source potential of South America by taking a role of basic assessment unit.The predicted undiscovered recoverable resource of South America is 214 065 MMBOE,which mainly concentrates in the eastern passive margin basins and western foreland basins.The eastern Venezuelan Basin,Maracaibo Basin,Santos Basin and Campos Basin are the four basins with large predicted source.