HYDROCARBON ACCUMULATION MODEL FOR THE EASTERN STEEP SLOPE OF LAKE ALBERT SAG, UGANDA
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摘要:
乌干达Albert湖凹陷是世界上最年轻的生烃凹陷，至今仍处于断陷伸展阶段，特殊的地质背景使其具有独特油气富集特征。为了预测Albert湖西部陡坡带的勘探潜力，利用地震、钻井等资料开展了凹陷构造特征研究，系统分析了陡坡带石油地质条件和成藏模式。研究表明，板式陡坡带油气侧向运移，成藏条件优越；台阶式陡坡带以垂向运移为主，侧向运移为辅，成藏条件一般。运移和保存是Albert湖陡坡带油气富集的主控因素，西部陡坡带一台阶是有利勘探区带，资源潜力较大。此研究对非洲陆内裂谷油气勘探具有重要的指导作用。
Abstract:As the youngest petroliferous basin in the world, the sag of Lake Albert has still undergone rifting up to present. This specific geologic condition leads to a special model of oil and gas enrichment. In order to evaluate and predict the exploration potential on west side of the Lake Albert, we applied seismic and drilling data for studies of the structural characteristics of the sag, and the petroleum geological conditions and accumulation pattern of oil and gas on the steep slope zone. Results show that one-step slope is perfect for lateral hydrocarbon migration and accumulation. Two-step slope is fair, but dominated by vertical migration. Migration and preservation are believed the main controlling factors for oil and gas enrichment on a steep slope as such in the Lake Albert. In the western steep slope, first step slope is favorable zone for exploration.
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Key words:
- East Africa Rift System /
- Lake Albert /
- accumulation model /
- Uganda
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