STUDY ON THE CHARACTERISTICS OF PETROLEUM SYSTEMS IN BURIED-HILL TRAPS

As we know,the geologic background of buried-hill traps is very intricate,and the study and exploration of buried-hill oil pools are quite difficult.The paper discussed the characteristics and complexity of buried-hill traps and analyzed the elements of buried-hill trap petroleum systems and their action processes based on the conception of petroleum systems.According to the contrast of formation time between source rock strata and buried-hillbasement and spatial-matching relationshipbetween them,three petroleum system or subsystem models of buried-hill traps were suggested,that is,the new source-old reservoir type,the old source-new reservoir type and the old source-old reservoir type.Associated with the examples and based on the three models,the authors also analyzed the characteristics of single and compound petroleum systems,discussed the methods of description and exploration and suggesed the ways of work.This would be of important theoretical and practical significance to the study and exploration of buried-hill pools,and also can be used as references for the study of petroleum systems in other known oil-pool traps.