摘要
北非阿尔及利亚叠合盆地石油地质条件优越,发育古生界海相优质烃源岩,纵向分布古生界和中生界2套碎屑岩储层,具有沿不整合面毯式运移和沿断层"T"型运移2种运移模式,可以划分为4种油气藏类型和2套油气成藏组合。分析认为,该盆地优质烃源岩发育控制着油气的富集,海西不整合面控制着油气的运移和聚集,区域蒸发岩盖层控制着油气的分布层位,古隆起斜坡区和断裂带是油气的有利聚集区。在今后油气勘探实践中,有效识别盐下低幅度圈闭是油气发现的关键,同时应针对隆起区和坳陷区分别采取不同的勘探策略,在隆起区要重视海西不整合面上倾方向三叠系砂体分布区,而在坳陷区则以寻找与断裂相关的复式油气聚集带为勘探方向。
Algeria superimposed basin in the northern Africa has good conditions in petroleum geology, including excellent Paleozoic marine source rocks, vertical distribution of two sets of clastic reservoir （ i. e. Paleozoic and Mesozoic reservoirs）, two types of migration （i. e. the ＂carpet＂ migration along unconformities and the ＂T＂ migration along faults）, four types of hydrocarbon pool and two types of hydrocarbon accumulation combination （play）. It is concluded according to our analyses in the basin that： （1） the hydrocarbon enrichment is controlled by the excellent source rocks; （2） the hydrocarbon migration and accumulation are contolled by Hercynian unconformity; （3） the stratigraphic hydrocarbon distribution is controller by the regional seal of evaporate; and （4） the slopes and faulted zones on palaeohighs are favorable to hydrocarbon accumulation. For the future hydrocarbon exploration, effective recognition of low-relief subsalt traps will be the key to make hydrocarbon discoveries, and different exploration strategies should be taken for the uplift and depression areas respectively. For the uplift areas, we should attach importance to the updip distribution of Triassic sandbodies over Hercynian unconformity, and for the depression areas, the exploration direction should be to seek the multiple zones of hydrocarbon accumulation associated with faults.
出处
《中国海上油气》
CAS
CSCD
北大核心
2013年第6期36-42,共7页
China Offshore Oil and Gas
基金
"十二五"国家科技重大专项"非洲
中东重点勘探区油气地质评价及关键技术研究(编号:2011ZX05030-003)"部分研究成果
关键词
阿尔及利亚
叠合盆地
成藏特征
主控因素
勘探方向
Algeria
superimposed basin
accumulation characteristics
main control factors
exploration direction
