Carbonate is one of the most important targets of hydrocarbon exploration in Tarim.Ordovician carbonate in Yubei area
distributes widely with large thickness,and its exploration prospect is excellent.However,the exploration degree is low.The
surface is desert with rugged sand dunes and deep buried target intervals,which is characterized by strong heterogeneity,rapid
longitudinal and lateral variation,unclear seismic response,so the reservoir is difficult to predict.Therefore,by integrating multi-
logging and core data,the reservoirs were classified.By crossplot analysis,the petrophysical characteristics of reservoirs and
host rock were analyzed.By seismic attributes extraction and forward modeling,the seismic responses of carbonate reservoirs
were studied,and some seismic attributes were identified as the sensitive parameters for reservoir prediction (wave
impedance,amplitude,amplitude variation ratio,coherence).Caves larger than 10〖KG*9〗m shows strong-amplitude string
reflection,which can be predicted by using conventional seismic data volume for extracting amplitude and its variation
ratio.Fractured and cavern reservoirs to some thickness and scale may lead to obvious variation of seismic amplitude,which
can be effectively predicted by utilizing conventional seismic data volume for extracting amplitude,its variation ratio and
coherent attribute combining with wave impedance inversion.
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