关键词: 陆相盆地, 不整合体系, 油气运移, 古风化带, 垂向结构, 薄层砂砾岩, 风化淋滤带

Abstract: The heterogeneous migration of petroleum in unconformity systems is closely associated with classification of unconformity systems and their vertical texture.In continental basins,different structural settings are responsible for the different kinds of unconformity system with different space-time patterns.The fault-fold unconformity and fold unconformity are the most favourable for petroleum migration.As a result,the superposition of different kinds of unconformity systems can lead to macro-heterogeneous migration of petroleum.The present unconformity system is resulted from paleoweathering zone undergoing weathering,eluviations and transgression in geological age.The vertical texture existed in the both systems.In an unconformity system,thin-layered sandstone-conglomerate and the middle karst zone are the perfect carrying beds.The development of fractures in weathering claystone could connect the two layered.Further more,the linear pathway directing to the great contrast revealed the preferred direction of petroleum migration,and the favourable traps were advantaged to petroleum accumulation.

Key words: continental basin, unconformity system, petroleum migration, paleoweathering zone, vertical texture, thin-layered sandstone-conglomerate, karst zone