西南石油大学学报（自然科学版）2025，Vol.47Issue(1)：130-146,17.DOI:10.11885/j.issn.1674-5086.2024.08.29.01
东非转换-伸展型被动陆缘盆地油气地质特征
Petroleum Geological Characteristics of Transformation-extensional Continental Margin Basins in East Africa
摘要
Abstract
In recent years,a series of large gas fields have been discovered in the deepwater areas of the Rovuma Basin and Tanzania Basin on the transform-extensional passive continental margin of East Africa,with recoverable reserves reaching 3.8×1012 m3.However,the resource discovery rate in this region is merely 13.1％,indicating a vast potential for undiscovered resources.Based on the comprehensive research achievements of passive continental margin basins in East Africa,this pa-per summarizes the geological conditions such as source rocks,reservoirs,traps,and migration within the area,and explores the combination patterns of source-reservoir-cap rocks.The results reveal that:1)The main source rocks in the transform-extensional passive continental margin basins of East Africa are mainly the lagoon facies and restricted marine shale or lime-stone of the Middle-Upper Jurassic-Cretaceous & the main reservoir rocks are the marine clastic rocks of the Middle-Upper Jurassic-Cretaceous-Neogene.2)Hydrocarbons are charged into the reservoirs through"vertical charging"or"lateral charg-ing"along faults,and"lateral charging"along unconformities or reservoirs;controlled by the complex tectonic evolution of East Africa,trap types dominated by structures and stratigraphic lithologies have formed.3)The conditions for hydrocarbon accumulation are most favorable in the Rovuma and Tanzania basins,and the favorable exploration horizons are the sandstone reservoirs of the Cretaceous-Neogene.The Triassic Calub Formation sandstone in the Somali Basin holds promising explo-ration prospects.With the advancement of exploration degrees and technical levels,significant breakthroughs are expected in the oil and gas exploration of other basins.关键词
转换—伸展型盆地/深水/油气地质特征/勘探潜力/东非被动陆缘盆地Key words
transformation-extensional basin/deepwater/petroleum geology characteristics/exploration potential/continental margin basin of East Africa分类
能源科技引用本文复制引用
范玉海,屈红军,朱楠..东非转换-伸展型被动陆缘盆地油气地质特征[J].西南石油大学学报（自然科学版）,2025,47(1):130-146,17.基金项目
国家科技重大专项(2016ZX05026) （2016ZX05026）
国家自然科学基金(91528303) （91528303）
榆林学院项目(2023GK01,H2024060121,H2024060082,H2024060047,H2024060006,H2024060005) （2023GK01,H2024060121,H2024060082,H2024060047,H2024060006,H2024060005）
