关键词: AVO, 多尺度, 亮点, 调谐, Marmousi Ⅱ

Abstract: The recognition of true and false bright spots is the key of success of lithologic oil-gas reservoir exploration. AVO (amplitude versus offset) theory provides theoretical basis for application of pre-stack information of seismic data to reservoir recognition. FVO (frequency versus offset) allows the prediction of reservoir using the post-stack information to be possible, despite its physical mechanism is now unclear. The numerical experiment indicates that the space variation of formation lithology can be reflected by the strike differences of different scales of seismic wave events in stack seismic record, and the strong amplitude caused by seismic wave tuning can be separated from that caused by reservoir's AVO applying the differences of multiple scales of seismic wave event reflectance energy. These provide a new method for effective recognition or distinguishing of reservoir for study of true and false bright spots in post-stack profile. Marmousi II model and real data processing show that this method can be used to recognize reservoir rocks.

Key words: AVO, multi-scale, bright spot, tuning, Marmousi II model