中国主要海相残留盆地有效成藏组合类型

经历了复杂构造演化历史的中国主要海相残留盆地具备了盆地油气成藏的最基本条件,诸如烃源岩、油源、输导系统、储集层、封盖层、圈闭等以及成藏动力学条件。海相残留盆地中,当有效烃源岩、有效储集体、有效封盖层系形成“三位一体”的有机配置时,即形成有效成藏组合。受盆地构造演化控制,中国主要海相残留盆地发育有加里东期风化壳上下组合、海西—印支期海陆交互相互层组合、中—古生界与陆相中—新生界“下生上储”组合等三类有效成藏组合。决定这些盆地成藏组合有效性的主要因素还包括油气成藏组合的封盖系统、成藏系统的构造分割性等。由此,不同海相残留盆地油气富集程度存在显著差异。

The Types of Effective Plays in the Major Marine Residual Basins in China

In China,the major marine residual basins experienced com- plicated tectonic evolution history.They control the basic con- ditions of hydrocarbon accumulation such as source rocks,hy- drocarbon source,transportation systems,traps,reservoirs, covers and dynamics.In these basins,effective plays are es- tablished when effective source rocks,effective reservoir bod- ies,and effective covers are matched by “three units into one”.Controlled by the tectonicl evolution of marine residual basins,three types of effective plays are formed in these basins,i.e.the upper and lower plays of Caledonian weath- ering crust,the Hercynian-lndosinian continental/marine in- terbed plays,and the Mesozoic-Paleozoic marine source/ Mesozoic-Cenozoic continental reservoir plays.The main fac- tors dominating these plays include cover systems,structural partition of play system and so on so that obvious differences of oil hydrocarbon accumulation are exist in extent for different marine residual basins.