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西湖凹陷春晓区带下第三系平湖组及花港组可划分出半封闭海湾、湖泊、三角洲及河流 4种主要的沉积体系类型 ,以及滨岸潮坪、泻湖、滨岸湖泊、河控三角洲、潮控三角洲、河流等 6种主要的沉积相类型和若干种亚相及微相。平湖组、花港组的发育与演化显示了由海到陆的变化特点 ,即平湖组主要为半闭塞海湾环境 ,以海湾泻湖相发育为其特征。花港组则以湖泊、三角洲、河流体系为主 ,并可明显两分 ,下段为海浸湖相 ,上段为淡水湖及曲流河泛滥平原的间互沉积。该区有利储集相带主要有潮渠水道、潮坪砂坝、河口坝、前缘席状砂及分流河道微相。
The Pinghu and Huaguang formations of the Tertiary Tertiary in the Chunxiao zone of West Lake Sag can be divided into four types of sedimentary system, including semi-enclosed bays, lakes, deltas and rivers, as well as the coastal tidal flat, lagoons, coastal lakes, river controlled deltas , Tidal delta, river and other six kinds of sedimentary facies types and a number of subfacies and microfacies. The development and evolution of the Pinghu and Huaguang formations show the changing characteristics from sea to land, that is, the Pinghu Formation is mainly a semi-occluded Gulf environment and characterized by the Gulf Lagoon facies development. The Huaguang Formation is dominated by lakes, deltas and fluvial systems and can be obviously divided into two parts. The lower part is the sea-water-lacustrine facies, and the upper part is the sedimentation between the freshwater lakes and meandering plains. The favorable reservoirs in this area are mainly tidal channels, tidal flat bars, estuarine dams, leading edge sands and distributary channel microfacies.