南非奥特尼夸盆地构造沉积演化与油气成藏
Tectonic and Sedimentary Evolution and Hydrocarbon Accumulation in the Outeniqua Basin,South Africa
肖坤叶 1秦雁群 1刘计国 1胡瑛 1张新顺1
作者信息
- 1. 中国石油勘探开发研究院 非洲研究所,北京 100083
- 折叠
摘要
南非奥特尼夸盆地油气勘探程度非常低,2019年与 2020年连续的天然气大发现吸引了国内外油气公司广泛关注.基于IHS数据库、新项目评价及文献等资料,综合分析表明:奥特尼夸盆地经历了二叠纪以来的前裂谷、同裂谷、过渡期和裂谷后 4个演化阶段;主要沉积了裂谷期陆相碎屑岩及过渡期-裂谷后的海相碎屑岩.盆地主力烃源岩为豪特里维阶和巴雷姆-阿普特阶海相页岩;发育了同裂谷期凡兰吟阶顶部浅海相砂岩和漂移早期阿尔比阶海相深水碎屑岩两套重要的储集层,储盖组合条件优越;共形成了巴雷姆-阿尔比阶砂岩、凡兰吟-豪特里维阶砂岩、上侏罗统-下白垩统砂岩和基底 4套成藏组合.油气分布呈"西多东少"格局,目前应以Bredas-dorp次盆大陆边缘深水区白垩系透镜状浊积砂岩为勘探重点.
Abstract
The degree of oil and gas exploration of Outeniqua Basin in South Africa is extremely low.The suc-cessive natural gas discoveries in 2019 and 2020 attracted extensive attention from oil and gas companies at home and abroad.Based on IHS database,assessment results of new ventures and literatures,comprehensive analysis shows that:The Outeniqua Basin experienced four evolutionary stages since the Permian period:pre-rift stage,syn-rift stage,transitional stage and post-rift stage;It mainly deposited continental clastic rocks in rift stage and marine clastic rocks in transitional stage and post-rift stage;The main source rocks in the basin are the marine shale of the Hauterivian period and Barremian-Aptian period;Two sets of important reservoirs,namely,the shallow marine sandstone at the top of the Valanginian in the syn-rift stage and the marine deep-water clas-tic rock of the Albian during the early drift period are developed,and the reservoir-seal combination conditions are superior;Four sets of reservoir-forming assemblages(plays)are formed,including Barremian-Albian sand-stone,Valanginian-Hauterivian sandstone,Upper Jurassic-Lower Cretaceous sandstone and basement;The dis-tribution of oil and gas is"more in the west and fewer in the east".At present,the exploration focus should be on Cretaceous lenticular turbidite sandstone in deep-water area of the continental margin of the Bredasdorp Sub-basin.
关键词
奥特尼夸盆地/南非/大气田/深水/成藏组合/浊积岩Key words
Outeniqua basin/South Africa/giant gas field/deep water/play/turbidite sandstone引用本文复制引用
基金项目
中国石油天然气股份有限公司科学研究与技术开发项目(2021DJ3103)
中油国际技术研发项目(2023-YFJJ-01)
中国石油天然气股份有限公司重大科技专项课题(2023ZZ0703)
中国石油天然气股份有限公司基础性前瞻性重大科技专项课题(2023ZZ0702)
出版年
2024
国家科技期刊平台
NSTL
万方数据