DISTRIBUTION AND CONSTRAINTS OF BURIED HILL RESERVOIRS IN THE JIYANG DEPRESSION,BOHAI GULF BASIN

Buried hill reservoirs in the Jiyang depression have complex types and are widespread,and structural fractures are the main oil accumulation space of buried hill reservoirs.The distribution of buried hill reservoirs in the Jiyang depression is mainly controlled by the process of basin formation.Tectonic movement is the most important factor for controlling the distribution of buried hills.The buried hill reservoirs are highly heterogeneous and there is appreciable difference in reservoir properties of different buried hill reservoirs.The exploitation characteristics of buried hill oil accumulations in the Jiyang depression are complex,the stable production period is short,the production capacities are greatly different and the water content increases quickly.The buried hills formed in or before the Mesozoic are the most favorable exploration target of buried hill oil accumulations in the Jiyang depression.