A passage system means the total amount of passages within a petroliferous system and its relative country rocks.The passage system could be divided into passage type

fracture type

fault type and unconformity type.A petroliferous system could have a passage system of several types.Different passage systems may result in different oil and gas migration and accumulation patterns

and in turn

the migration and accumulation patterns could reform the old passage system or even form new ones.Since the passage systems are relatively independent

spacio temporal characterisics and complicated

their 3-D space comfigurations and transporting capacities should be studied.