| 饶 勇.中非Doseo盆地油气地质条件及成藏控制因素分析[J].地质与勘探,2023,59(5):1117-1127 |
| 中非Doseo盆地油气地质条件及成藏控制因素分析 |
| Hydrocarbon accumulation characteristics and controlling factors of the Doseo Basin in Central Africa |
| 投稿时间：2023-02-20 修订日期：2023-07-07 |
| DOI：10.12134/j.dzykt.2023.05.017 |
| 中文关键词: 裂谷盆地 油气地质条件 控制因素 Doseo盆地 中非裂谷系 |
| 英文关键词: rift basins, petroleum geological conditions, controlling factors, Doseo Basin, Central Africa rift system |
| 基金项目:中国海洋石油有限公司“十四五”重大科技项目:“两岸- - 带”重点盆地油气富集规律和成藏差异性研究(编号: KJGG2022-0901)资助 |
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| 中文摘要: |
| 中非裂谷系Doseo盆地是白垩纪以来叠加了走滑和挤压反转等作用的复杂陆相裂谷盆地，具有优越的油气地质条件，且勘探程度较低，是当前油气勘探热点区域，但油气分布不均，不同构造带油气规模差异大。本文基于钻井和典型油气藏对比分析，系统阐述了盆地油气地质条件，并探讨了不同构造带油气成藏控制因素。研究表明，盆地经历了三个主要的构造-沉积演化阶段，形成“东西分区，南北分带，北陡南缓”的构造格局，构成了“下细上粗”的湖盆-三角洲-河流沉积充填序列。下白垩统强裂陷期两套优质成熟湖相烃源岩、多套储-盖组合以及一系列构造圈闭为油气聚集成藏提供了有利的石油地质条件。已发现油气藏以构造圈闭为主，但油气发现规模与烃源岩潜力严重不符。通过分析，油气成藏主要受储层、盖层和圈闭保存条件三个因素及匹配关系控制，而圈闭保存条件是全区共有最重要控制因素，且不同构造带油气成藏控制因素具有差异性。南部缓坡带成藏控制因素为盖层和圈闭保存条件，东部凸起构造带成藏控制因素为圈闭保存条件，北部陡坡带成藏控制因素为储层和圈闭保存条件。 |
| 英文摘要: |
| The Doseo Basin located in Central Africa Rift system is a complex continental rift basin superimposed with strike-slip, compression as well as inversion since the Cretaceous with favorable petroleum geological conditions and a low level of exploration. It is a hot spot for oil and gas exploration at present, but shows uneven distribution of hydrocarbons, and the scale of hydrocarbons varies greatly in different tectonic zones. Based on comparative analysis of wells and typical oil and gas reservoirs, the petroleum geological conditions were systematically explained, and the controlling factors of hydrocarbon accumulation in different structural belts were discussed. The results show that the Doseo basin has experienced three main structure-sedimentary evolution stages forming the “east-west segmentation, south-north zonation, steep in the north and gentle in the south” tectonic framework, constituting an “upward coarsening” filling sequence of lacustrine, delta and fluvial sedimentation. Two sets of high-quality mature source rock, several sets of reservoir-cap assemblages , and a series of structural traps provided favorable geological conditions for hydrocarbon accumulation in the strong rifting stage of the Lower Cretaceous. The discovered oil and gas reservoirs are mainly composed of structural traps but the hydrocarbon scale is not consistent with the potential of source rocks. It is concluded that hydrocarbon accumulation is mainly controlled by the reservoir, cap rock, and trap preservation conditions and their matching relationships in different structural belts, and the trap preservation condition is the most important controlling factors for the whole area. Caprock and trap preservation conditions are the controlling factors in the Southern Gentle Slope belt, with trap preservation for the Eastern Uplift, and reservoir and trap preservation for the Northern Steep Slope belt. |
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