摘要
对宽扎盆地陆上区域地质特征和已发现油气的分布规律分析后认为:Cabo Ledo转换断层以北地区盐隆区与地堑广泛接替分布,盐间和盐上油气成藏基本要素匹配关系良好,盐间早白垩世盐隆形成的背斜、断背斜及碳酸盐岩台地、盐上古近系地堑中的龟背斜具有广泛勘探前景,是新一轮勘探工作中最具现实意义的油气潜力区;Cabo Ledo转换断层以南地区盐挤构造特征明显,由于地层剥蚀严重,背斜顶部几乎没有渐新世以后沉积的地层,翼部残留的是始新世地层,该区盐上含油气系统不发育;宽扎陆上盆地盐下油气成藏潜力巨大,但勘探风险较高,有利勘探目标为同裂谷阶段断陷拉伸作用形成的地堑。
The geologic characters and the distribution of oil and gas discovery of onshore area of Kwanza Basin were investigated,it was indicated that in the north of Cabo Ledo transform fault,salt uplift and graben were widely distributed with basic factors of hydrocarbon accumulation in both intra-salt and post-salt were well matched,the favorable structures including cretaceous anticline,faulted anticline,carbonate platform in intra-salt sequence,and turtle anticline in post-salt sequences Tertiary graben,these were the most realisticl and significant potential areas of new around of oil exploration.In the south of Cabo Ledo transform fault,salt compressive structures were widely distributed,due to the serious stratigraphic erosion,the strata after the Oligocene were difficult to be found out in the anticlinal apex,only Eocene strata remained in the anticlinal flanks,the post-salt petroleum system was not existed in this area.Pre-salt sequence has great exploration potentialities,but with high risk.The favorable exploration targets are the grabens formed by extended rift in syn-rift phases.
出处
《长江大学学报（自科版）（中旬）》
2016年第1期18-21,4,共4页
Journal of Yangtze University(Nature Science Edition)
关键词
宽扎陆上盆地
盐岩
构造特征
油气成藏特征
Kwanza Onshore Basin
salt rock
structure characteristics
hydrocarbon accumulation characteristics
