摘要
通过对下刚果盆地烃源岩发育特点与油气分布规律的研究,认为烃源岩是控制该盆地油气差异性分布的关键因素。下刚果盆地发育盐下湖相、盐上海相2套烃源岩,油气分布具有纵向分层、平面分带的差异性特征。该盆地陆上及浅水区以盐下湖相烃源为主且多为中—小型油气田,而深水区以盐上海相烃源为主且多为大—中型油气田;盐下裂谷期地堑发育程度南弱北强,导致了盐下烃源岩发育规模南小北大,形成了浅水区南部以小型油气田为主、北部以中—小型油气田为主的差异分布特点;刚果扇沉积中心由南向北迁移,导致了深水区盐上烃源岩的成熟度由南向北逐渐降低,形成了深水区油气田分布数量与规模由南向北明显减小的差异分布特点。
By researching the source rock characteris-tics and hydrocarbon distribution in Lower Congo basin, it can be considered that the source rocks are a key factor to control differential hydrocarbon distributions in the basin. There are two sets of source rock, i.e. the pre-salt lacustrine facies and the postsalt marine facies, and the hydrocarbon distribution is characterized by vertical beds and areal zones in this basin. The onshore area and shallow water in the basin are predominated by the pre-salt lacustrine source rock, with most fields in middle-small size; and the deep water in the basin is predominated by the post-salt marine source rock, with most fields in large-middle size. The pre-salt rifting graben devel- oped weaker in the south and stronger in the north, with the distribution of pre-salt source rock smaller and larger respectively in the south and the north, which has resulted in a differential hydrocarbon dis- tribution that the southern and northern shallow wa- ter are predominated respectively by small fields and small-middle fields. The migration of Congo fan dep- ocenter from the south to the north has made the post-salt source rock maturity decrease towards the north in the deep water, which has resulted in an- other differential distribution that the deep water fields decrease dramatically in both number and size from the south to the north.
出处
《中国海上油气》
CAS
北大核心
2012年第5期16-20,共5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
下刚果盆地
烃源岩
油气分布
差异性
Lower Congo basin
source rock
hy-drocarbon distribution
difference
