Abstract：The shallow low velocity layer in Sanhu areacan cause 'push-down' phenomenon of seismic reflection event from shallow to deep, which brings trap to gas recognition. Only using correct static corrections to eliminate the influence of shallow low velocity layer,can the 'push-down' phenomenon of seismic reflection event caused by gas-bearing bed become unique interpretation. The static corrections presented by the paper is to use tomo-graphic inversion static correction to determine V1 velocity and referential model, use refraction static correction to compute statics, then, separate high-frequency components from low-frequency components, first using high-frequency components and then applying poststack low-frequency components to determine the structural feature and tie at cross points. The residual statics is to be solved by reflection automatic residual static correction. The drilling result in Taidong No. 2 gas-bearing anomaly showed the correctness of the static corrections approach presented by the paper.
