The basin-range coupling relation is a leading subject of the modern geology. In geometry, relations of this type include couplings between stretched orogenic belt and down-faulted basin, compressional orogenic belt a...The basin-range coupling relation is a leading subject of the modern geology. In geometry, relations of this type include couplings between stretched orogenic belt and down-faulted basin, compressional orogenic belt and foreland basin, strike-slip orogenic belt and strike-slip basin and so on. Fault chains are the key for these couplings and there are typical examples for all these cases. The North China down-faulted basin is coupled west with the Taihang uplift, east with the Jiao-Liao Mountains, north with the Yanshan orogenic belt and south with the Dabie orogenic belt, that is to say, the central down-faulted basin and the surrounding orogenic belts bear a coupling relation within a uniform dynamistic system. Study shows that the central down-faulted basin and the North China mantle sub-plume structure have a close relation during their formation. Owing to intensive mantle sub-plume uplifting, the bottom of the lithosphere suffered from resistance, which caused the lithosphere of the eastern North China to be heated, thinned and fault-depressed. Meanwhile, mantle rocks that were detached outwards in the shape of mushroom was dissected by surrounding ductile shearing zones, which lead to decompression and unloading to generate hypomagmas, and a series of mantle-branch structures were formed around the down-faulted basin. There is an obvious comparability among these mantle branch structures (orogenic belts), and they have basin-range coupling relations with the central down-faulted basins.展开更多
基于地质、地震和钻井资料,对东非阿尔伯特盆地(Lake Albert Basin)的形成演化及构造—沉积地层特征进行了研究,深入分析了盆地石油地质特征,总结其成藏模式及油气富集条件。盆地主要受东非裂谷期构造运动的影响,形成两侧以深大断裂为...基于地质、地震和钻井资料,对东非阿尔伯特盆地(Lake Albert Basin)的形成演化及构造—沉积地层特征进行了研究,深入分析了盆地石油地质特征,总结其成藏模式及油气富集条件。盆地主要受东非裂谷期构造运动的影响,形成两侧以深大断裂为界、狭长(半)地堑的构造格局。沉积地层以新近系碎屑岩为主,岩性多为泥岩、砂岩和砾岩。河流—(扇)三角洲—湖泊沉积体系发育,主要烃源岩为中新统上部富有机质页岩,中新统—上新统河流相、(扇)三角洲相砂岩为主要储层,与细粒湖相泥岩在纵向上形成良好的生储盖匹配。盆地发育大量断块、断背斜等构造圈闭。盆地成藏模式为"凹陷供烃、侧向与垂向复合运移、下生上储",生储盖匹配良好控制垂向上形成多套成藏组合,优质砂体与垂向断层控制油气有效运移,断层控制的构造圈闭是油气聚集的主要场所。展开更多
基金supported by the National Natural Science Foundation of China(grants 40272088,40072073)the Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX1-07)the Project of Large scale Geological Survey in China(200110200038).
文摘The basin-range coupling relation is a leading subject of the modern geology. In geometry, relations of this type include couplings between stretched orogenic belt and down-faulted basin, compressional orogenic belt and foreland basin, strike-slip orogenic belt and strike-slip basin and so on. Fault chains are the key for these couplings and there are typical examples for all these cases. The North China down-faulted basin is coupled west with the Taihang uplift, east with the Jiao-Liao Mountains, north with the Yanshan orogenic belt and south with the Dabie orogenic belt, that is to say, the central down-faulted basin and the surrounding orogenic belts bear a coupling relation within a uniform dynamistic system. Study shows that the central down-faulted basin and the North China mantle sub-plume structure have a close relation during their formation. Owing to intensive mantle sub-plume uplifting, the bottom of the lithosphere suffered from resistance, which caused the lithosphere of the eastern North China to be heated, thinned and fault-depressed. Meanwhile, mantle rocks that were detached outwards in the shape of mushroom was dissected by surrounding ductile shearing zones, which lead to decompression and unloading to generate hypomagmas, and a series of mantle-branch structures were formed around the down-faulted basin. There is an obvious comparability among these mantle branch structures (orogenic belts), and they have basin-range coupling relations with the central down-faulted basins.
文摘基于地质、地震和钻井资料,对东非阿尔伯特盆地(Lake Albert Basin)的形成演化及构造—沉积地层特征进行了研究,深入分析了盆地石油地质特征,总结其成藏模式及油气富集条件。盆地主要受东非裂谷期构造运动的影响,形成两侧以深大断裂为界、狭长(半)地堑的构造格局。沉积地层以新近系碎屑岩为主,岩性多为泥岩、砂岩和砾岩。河流—(扇)三角洲—湖泊沉积体系发育,主要烃源岩为中新统上部富有机质页岩,中新统—上新统河流相、(扇)三角洲相砂岩为主要储层,与细粒湖相泥岩在纵向上形成良好的生储盖匹配。盆地发育大量断块、断背斜等构造圈闭。盆地成藏模式为"凹陷供烃、侧向与垂向复合运移、下生上储",生储盖匹配良好控制垂向上形成多套成藏组合,优质砂体与垂向断层控制油气有效运移,断层控制的构造圈闭是油气聚集的主要场所。
