Classification and exploration of subtle reservoirs in continental rifted-basin

To guide the exploration and development of subtle reservoirs,Jiyang depression is used as an example to carry out the classification and exploration study about subtle reservoirs in continental rifled-basin.According to trap genetic type and petroliferous features,subtle reservoirs can be classified into 3 categories like lithologic,stratigraphic,and fractured reservoirs.For different types of subtle reservoirs,different geological models and techniques should be adopted to improve the success ratio and benefit of exploration.