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Study of S-wave test and measurement technique in laboratory.

Wei Jianxin,Key Geophysical Laboratory,CNPC, University of Petroleum, Beijing City, 100083, China  
Study of S-wave in laboratory is paid more and more attention to in geophysical exploration. Affecting by many factors during test of S-wave in the laboratory, such as the characteristics of S-wave transducer, the size and structure of core sample,test position and coupler,the S-wave test and measurement in laboratory is more difficult than P-wave survey. Starting from knowing the structures and characteristics of S-wave transducer, the paper listed the use of various kinds of S-wave transducer and some skills of S-wave test and measurement. It's need to pay attention to follow-ing items in order to obtain high-quality of results of S-wave test: ①the polarizing characters of S- wave transducer is needed to carefully known; ②honey and tinsel are best coupler; ③the polariza-tion of transducer in transmitter and receiver must be coincident in uniform and homogeneous medi-um; ④it must pay attention to the conversion of vibrated mode when the radius of core sample is less than 25 mm.
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