Abstract：The dominant imaging frequency acquired by seismic acquisition in an area has its limitation because of attenuation by earth absorption and influence of interference. This limitation is called as resolution limitation of 1/4 wavelength. Normally,the limitation is often difficult to meet the demand of geologists for surveying thin and interbedded geologic targets (especially in development seismic exploration). Through processing and interpretation of real 3-D seismic data in a reservoir (pinch-out) condition of depth of 5000 m and thickness of 0-35m,the paper studied pinch-out boundary which thickness is less than 1/4 wavelength. Through adopting the processing flow of relative reserving amplitude and improving resolution and on the basis of calibration by seismic logging and VSP data and interpretation of subtle structures,the paper makes recognition of seismic amplitude and waveforms along the beds and synthetic analyses of forward modeling and development information。The analyzed results showed that we can identify such geologic bodies as thin lenticular sand and lithologis pinchout etc. by amplitude-tuning role. The set of processing and interpretation approaches are particular suitable for lithologic oilgas reservoir's exploration in Chinese continental sedimentary envtronment.
