摘要
东委内瑞拉盆地是一个沉积构造复杂的前陆盆地,盆地南缘的奥里诺科重油带为世界上最大的重油和油砂聚集区。盆地内丰富的油砂资源是被动边缘阶段广泛发育的上白垩统烃源岩、前陆盆地阶段发育的多套优质储盖组合、大范围连通砂体、足够的油气远距离运移动力和相对开放的氧化环境综合作用的结果。在分析油砂成矿条件的基础上,针对盆地内不同的构造性质和构造位置,提出斜坡降解型和构造抬升型2种成矿模式,为今后油砂资源的研究奠定基础。
Eastern Venezuela Basin is a foreland basin with complex sedimentary structure.The Orinoco Heavy Oil Belt located in the south margin of the basin is the largest heavy oil and oil-sands accumulation in the world.There are some factors combined to generate the abundant oil-sands resources in the basin: upper Cretaceous source rocks developed widely in the passive margin evolutionary phase;several sets of quality reservoir-cap rock combination and a wide range of connected sand-bodies developed in foreland basin unit;adequate driving force for long-distance hydrocarbon migration;and relative openness of oxidizing environment.By analyzing the metallogenic conditions of oil sands,different structural properties and tectonic settings,this paper proposes two metallogenic models: slope degradation type and tectonic uplift type,making a foundational work for future study of oil-sands.
出处
《特种油气藏》
CAS
CSCD
2010年第6期42-45,共4页
Special Oil & Gas Reservoirs
基金
中国石油天然气集团公司基金项目"全球非常规油气资源评价"(2008E-0502)
关键词
油砂
成矿条件
成矿模式
东委内瑞拉盆地
奥里诺科重油带
oil-sand
metallogenic condition
metallogenic model
Eastern Venezuela Basin
Orinoco Heavy Oil Belt
