Abstract:

Dagang shallow water area,lying in interior region in Bohai Bay Basin, is located on 5 m water depth area in east seashore of Huanghua rift valley, and is the complicated structure area formed in Tertiary. This area from top to bottom develops four sets of main oil generative assemblage(Ed_2,Es₁z,Es₂,Es₃)Reservoirs develop;and alluvial fan,subsea apron,delta,fan delta,braided channel fan,gravity flow and lake carbonate rock are distributed abroad in the area.Eight second order positive structural belts approximately from east to west or from north to south in the sunken, have precondition to form large or medium-sized reservoir. This paper discusses the reservoir-forming conditions and pool abundance laws through analysis of petroleum geological conditions including the formation,reservoir,structure,oil generating,reservoir forming,and so on.The paper also points out potential in terms of the geological conditions and present developing situation. Conclusion has been drawn that Dagang shallow water area with abundant resources, good reservoir forming conditions and low exploration extent will be realm of reserves and production increasing in Dagang oilfield despite of its complicated subsurface conditions and needs of advanced exploration technology and high cost with high risk.

Key words: Dagang shallow water area, petroleum geological condition, reservoir, exploration potential