The writer believes that the formation and deformation of the upperearth crust result from the wave-like movement of the crust.Geostress ispropagated in the form of waves.The following are important for oilexploration:1.The regular step-like uplifting and subsidence of the uplifting and subsiding belts are the main controlling factors of large sedimentary basins

i.e.control of the basin-forming epochs;2.Mutual displacement and oscillation of symmetrical subsidence inlarg sedimentary basins causing active subsiding belts provide conditionsof oil formation

i.e.control of the oil-forming epochs;3.Symmetrical folds and faults along dominant directions in large se-dimentary basins——the folding

faulting and uplifting directions are those of oil and gas migration.