特种油气藏2025，Vol.32Issue(6)：33-39,7.DOI:10.3969/j.issn.1006-6535.2025.06.004
南加蓬盆地阿普特期不整合特征及对油气藏的控制作用
Aptian unconformity characteristics and their controlling role on petroleum reservoirs in the South Gabon Basin
摘要
Abstract
During the Early Cretaceous Aptian,widespread regional unconformities formed along the mid-South At-lantic rift basins,acting as major hydrocarbon migration pathways.With the South Gabon Basin in West Africa as an example,using seismic,drilling,reservoir data analysis was made on the types,structures and spatial distribution of Aptian unconformities to study their control on petroleum accumulation.Results showed that above and below the unconformity,overlaying anticlines(thrust-related folds)and relict erosional structures developed,respectively.Ver-tically,a dual-layer structure existed:the upper layer consisted of widely distributed water-conducting sandstones with good properties,high sand fractions and effective sealing by overlying salt,serving as long-distance hydrocar-bon migration pathways;the lower layer of semi-weathered sandstones and rapidly varying shales lacked thick weath-ered clay caps and could not act as effective lateral conduits.These characteristics led to formation of structural-stra-tigraphic composite petroleum traps in the interior sag,overthrust anticline traps in the central uplift,and faulted traps in the outer sag.This study provides valuable insight for exploration in South Atlantic rift basins.关键词
南加蓬盆地/不整合/输导体系/披覆背斜/复合油气藏Key words
South Gabon Basin/unconformity/migration pathway/overthrust anticline/composite petroleum trap分类
能源科技引用本文复制引用
李海滨,黄健良,任艳..南加蓬盆地阿普特期不整合特征及对油气藏的控制作用[J].特种油气藏,2025,32(6):33-39,7.基金项目
中海油"十四五"重大科技项目"两岸一带重点区油气勘探评价关键技术"(KJGG2022-0902) （KJGG2022-0902）
