The reasonable thinking of interpreting low quality seismic data of complex fault block is to interprete large fault controlled structural framework and the whole structural feature first

then interprete small structures and oil layers within big block.In the interpretation of regional structural feature

coherence data set block was used to study fault distribution regularity;structural model built according to 2-D section was used to interprete low quality 3-D seismic data;to interprete regional structural feature based on fault distribution.In local structure interpretation

one should pay attention to the interpretation of the top structures of oil horizon and the correlation of reflecting horizon;then use pre stacking depth shift data to interprete structures.These method can considerably improve the results of interpretation

the success ratio of drilling can be improved from 38% to 80%.