东海西湖凹陷始新统沉积环境及含油气性

东海西湖凹陷始新统平湖组为半封闭海湾沉积环境,海水由南往北侵入,平湖组下段为海湾浅水—滨岸—滨岸冲积平原相沉积;平湖组中段为潮坪—三角洲相沉积;平湖组上段为三角洲相沉积。业已证明,始新统平湖组不但具有极好的生油气条件,而且发育良好的储集层。油气分布除了受构造因素控制外,与沉积相有极为密切的关系。

EOCENE SEDIMENTARY ENVIRONMENT AND OIL AND GAS BEARING FEATURES OF XIHU SAG IN THE SHELF BASIN OF THE EAST CHINA SEA

Pinghu formation of Eocene in Xihu sag of the shelf basin of the East China Sea is semi-closed bay sedimentary environment. Marine transgression is from south to north. The early-middle Eocene is a transgression process, while the middle-late Eocene is a regression process. Lower member of Pinghu formation is of bay-shore-delta sedimentary model; The paper has discussed the distribution and burial etc. hydrogeological conditions of deep fresh-:water aquifers in Shanghai and neighbouring areas and also the prospects of reasonable developing each aquifer as well.