东海西湖凹陷始新统沉积环境及含油气性

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

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。

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.