DISCRIMINATING EFFECTIVE PETROLEUM MIGRATION PATHWAYS IN RIFT BASINS—TAKE THE DONGYING SAG AS AN EXAMPLE

To ascertain transmit faults is the key factor to confirm the effective migration pathways which are consist of fault,sand body,unconformity,etc.in!continental rifted basin.Take central uplift belt in the Dongying Sag as an example,begin with the geochemical behavior,fluid property,hydrocarbon show,petroleum physical property etc.,the discriminating methods and distribution of effective migration pathways are definitely.The results show that effective migration pathways in rift basins are controlled by fault validity in time and space,these faults and contacted sand bodies make up effective migration pathways together.Oil and gas divergent from generating sub-sags and accumulate toward the advantage parts of transmit fault with the formation and distance changed.Second and third faults against petroleum generating sub-sags with relatively longer active time are the effective migration pathways, which are well match with the oil-generating stage,and controlling the distribution and process of petroleum.