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南方白垩系多以红色、紫红色碎屑岩为主,夹蒸发岩,由于缺乏烃源岩,在勘探上一直没有受到应有重视.随着油气勘探的深入,近年来陆续发现大量白垩系油气藏或油气显示,显示出白垩系良好的勘探潜力.研究发现白垩系发育优质储层和高效盖层,同时白垩系与下伏古生代-早中生代海相地层和上覆新生代陆相地层构成叠合盆地,这两套层系均发育多套优质烃源岩.在南方特别是中下扬子地区喜马拉雅期以来强烈的拉张断陷作用伴生了大量的断裂,这些断裂沟通了白垩系与上下覆地层的烃源岩,形成了断裂型和不整合型的不连续的生储盖成藏组合,来自古近系烃源岩和具有二次生烃能力的中生代、古生代烃源岩的充足油气在白垩系形成新生古储型、古生新储型和少量自生自储型油气藏,其油气富集成藏关键因素是临近生烃中心、油气源充足,其二是断裂系统相对发育,为白垩系油气成藏提供了必要输导体系.
Due to the lack of source rocks, the Cretaceous in the southern part of the Cretaceous mostly has red and purple red clastic rocks, which have not received much attention in the exploration.With the deep exploration of oil and gas, a large number of Cretaceous hydrocarbons have been discovered in recent years The reservoir or hydrocarbon shows good exploration potential of the Cretaceous.The study found that the Cretaceous developed high-quality reservoirs and high-cap rocks, and the Cretaceous and underlying Paleozoic-Early Mesozoic marine strata and overlying Cenozoic terrestrial strata Together with the basin, both sets of strata have developed several sets of high-quality source rocks, and a large number of faults have resulted from the intense tensile-faulting faults in the southern, especially in the mid-lower Yangtze region. These fractures have communicated between the Cretaceous and the upper and lower strata In the stratigraphic source rocks, the fractured and unconformitydiscontinuous reservoirs and caprock assemblages are formed. The abundant oil and gas from Mesozoic and Paleozoic source rocks of Paleogene source rocks and secondary hydrocarbon generation Cretaceous formation of Neogene ancient reservoir type, Paleozoic reservoir type and a small amount of self-generating self-storage reservoirs, the key factor of hydrocarbon accumulation and accumulation is near the hydrocarbon generation center, adequate source of oil and gas, and the second relative development of the fracture system , Which provides the necessary transportation system for Cretaceous hydrocarbon accumulation.