摘要：

二叠系是中国南方重要的海相含油气层系，经历了两次大的海侵－海退沉积旋回，形成了以海相碳酸盐岩为主，海相、陆相及过渡相并存的沉积古地理格局。根据典型剖面分析和岩相古地理研究，识别出4类沉积体系，即陆地沉积体系、混合沉积体系、碳酸盐台地沉积体系和斜坡盆地沉积体系。总结出4类基本的沉积体系组合，指出海平面变化和构造运动是控制沉积体系变化及其空间展布的决定因素。最后对成油气地质条件进行了分析和讨论，认为二叠系具有多套生储盖组合，其中以碳酸盐台地体系－斜坡盆地体系组合和混合沉积体系－斜坡盆地体系组合最为理想。

Abstract:

The Permian is an important marine origin oil and gas bearing stratum. Two big transgressiveregressive sedimentary cycles have been recognized, which are responsible for a sedimentary palaeogeographic framework of coexisting marine facies, land facies and transitional facies, with marine carbonate rocks being dominant during the Permian. Based on lithofacies palaeogeography study and typical profiles analysis, four depositional systems, i.e. land depositional system, mixed depositional system, carbonate platform depositional system and slopebasin depositional system are recognized. Spatial relationships of different depositional systems are summarized, and four basic  depositional system associations are generalized. It is pointed out that the sealevel changes and tectonic movements are the key factors controlling the changes and spatial distribution of depositional systems. Finally, Permian oil and gas forming conditions —— generating, reservoiring, capping and their associations are analyzed. It is suggested that there are many associations of generating, reserroiring, capping in the Permian, among which the associations of carbonate platform system and slopebasin system, and mixed system and slopebasin system are the best ones.