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Cao Junxing; Yan Zhongqiong  
The evaluating formulas and numerical examples of the possible resolving powef of seismic crowhole traveltime tomography on simple velocity abnormalities are given according to Fermat's principle. The examples show that the possible resolvins power iS much hiSh, specially on high-velocity abnormalities and on 2-dimension abnormalities crossing the hole with a large angle. With regard to lowvelocity abnormalities,there is a critical velocity value which depends on many factors. It is impossible to reconstruct the real velocity distribution when the velocity of abnormality is lower than the critical velocity. A critical velocity can be used to inspect the precision of the ray tracins and inversion algorithm.
【CateGory Index】: P631.44
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