| Crack is not only growing in sedimentary rock, but also in metamorphic rock and igneous rock. Crack is a good migration pathway in reservoir, so it has great effect in penetrability of oil and gas, especially when fissured oil field come into development phase. Forecasting crack and it's distribution mode is almost equivalent to forecasting oil and gas, so it is important to correctly understand underground crack in exploratory development.In the paper, I apply diversiform geophysical methods to forecast crack in Tazhong area, and accumulate the experience of forecasting crack. These experience and methods are propitious to exploring and developing other fracture-cavity reservoir, and it has the same affirmative effect in developing success rate of exploitation well and recovery efficiency of development well.The paper gives an example of Katake 1st block of Tazhong area in Talimu basin. According to the actual produce instance, we use cohere processing, seismic logging inversion processing, fracture-cavity reservoir sensitivity logging curve reconfiguration inversion processing, seismic attribution analysis technique and constructure study to predict the space distribution of profitable fracture-cavity system in carbonate reservoir. And then provide credible evidence for preferred exploration targets.I test some technology and method in this job, such as cohere analysis, waveform analysis, dip calculation, seismic inversion, seismic attribute extracting and so on. By comparing and analysing these methods, I have got the final conclusion that there are 6 technology having good effects in predicting space distribution of profitable fracture-cavity system in carbonate reservoir in this area, that is, seismic attribute extracting technique, 3D seismic coherence technique, seismic logging cooperative inversion technique, waveform analysis technique, multi-parameter clustering procedure analyse technique and multi-parameter interfusion reservoir estimate technique.
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