海相油气地质2025，Vol.30Issue(5)：425-434,10.DOI:10.3969/j.issn.1672-9854.2025.05.004
西非宽扎盆地盐下白垩系湖相碳酸盐岩勘探方向
The exploration direction of the Cretaceous pre-salt lacustrine carbonate rocks in the Kwanza Basin,Western Africa
摘要
Abstract
Kwanza Basin,located in Angola and its adjacent offshore area along the West African coast,is a typical passive continental margin salt-bearing basin.It comprises three major structural layers:pre-salt structural layer,salt structural layer,and suprasalt structural layer.The pre-salt Cretaceous lacustrine carbonate rocks represent the primary target for hydrocarbon exploration in the basin.The pre-salt structural layer exhibits a tectonic pattern of alternating depressions and uplifts,which can be divided into the Inner Rift Zone,Central Uplift Zone,and Outer Rift Zone from east to west.The hydrocarbon accumulation mechanism in pre-salt lacustrine carbonate rocks is characterized by"rift-controlled source rocks,uplift-controlled reservoirs,salt-controlled seals,and high-quality reservoirs controlling accumulation".The Central Uplift Zone,with well-developed basement uplifts,not only facilitates trap formation and carbonate reservoir development but also serves as the migration pathway for hydrocarbons,making it the most favorable area for pre-salt Cretaceous carbonate reservoir accumulation.The presence of high-quality reservoirs is critical for successful exploration.Based on newly acquired seismic and drilling data,this study investigates the factors influencing the differential distribution of pre-salt lacustrine carbonate reservoirs.The analysis further narrows down the prospective exploration areas for subsalt hydrocarbon plays in the Kwanza Basin to the northern part of the Central Uplift Zone,providing guidance for regional evaluation and exploration target selection.关键词
湖相碳酸盐岩/盐下/成藏模式/中央隆起带/宽扎盆地Key words
lacustrine carbonate rocks/pre-salt/hydrocarbon accumulation model/Central Uplift Zone/Kwanza Basin分类
石油、天然气工程引用本文复制引用
刘静静,郭荣涛,霍红,宫越,汲生珍..西非宽扎盆地盐下白垩系湖相碳酸盐岩勘探方向[J].海相油气地质,2025,30(5):425-434,10.基金项目
本文受新型油气勘探开发国家科技重大专项下属课题"被动陆缘盆地重点探区油气富集规律研究与规模增储技术"(编号:2025ZD1400805-02)、中石化科技部项目"西非重点盆地油气成藏条件与勘探评价"(编号:P20057-1)和"滨里海盆地古生界勘探潜力与目标优选"(编号:P25081)联合资助 （编号:2025ZD1400805-02）
