Abstract：Giving emphasis to seismic reflection waveforms,seismic coherent analysis technology aimed at making a determination of lateral lithologic variation for sub- surface reservoir. Its synthetic condition is that waveforms between traces must be similar when event is continuity and lateral geologic and geophysical parameters have not significant changes. The waveforrn character on seismic section will be changed when faults and cracks well developed;measured it with mufti-channel coherent rule,found relations between variation in waveform character and similar coefficient,it can predict if there are distributions of faults or fractures in a new survey zone according to changing rule of similar coefficient in a known area. Modeling results show that the method can sensitively reflect the changes between traces caused by factors of faults(or variant lithologic zone),cracks etc. and can be used to predict fault system and fracture development zone of reservoir. Practical application of it in LX and CD regions shows good results.
