Through reviewing the discovery history of the Bianminyang(BMY)oilfield in the Subei Basin

this paper analyzes the changes of petroleum geology understandings

such as hydrocarbon generation

expulsion

migration

structure formation

and accumulation

after discovery of the oilfield

and summarizes the application results of new technologies including 3D seismic survey and deviated well-drilling.The discovery of BMY oilfield bears great significances and has a positive impact upon subsequent assessment of the hydrocarbon resources in the basin

understanding of reservoiring patterns

shifting of exploration concepts

and application of new technologies.