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| Numerical study for SKC-B big,numeral control and full-wave logger |
| Shen Jianguo1, Chen Yu1, Zhang Hailan2, Yuan Fuwen3 |
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Abstract SKC-B big,numeral control and full-wave logger was developed in the 1990s at home.The paper conducted numerical simulation for it,computed full waveform in different formation in hole and analyzed and discussed the characters of P-wave,S-wave,pseudo-Rayleigh wave and Stoneley wave on their full waveform by corresponding 2-D spectrum.The intrinsic frequency of P-wave increases because of existence of apparatus and its amplitude has been influenced by velocity ratio of P-wave vs S-wave.Dispersion of pseudo-Rayleigh wave decreases and its velocity gradually approaches S-wave velocity of formation when formation velocity becomes lower and S-wave velocity approaches the sonic velocity of fluid in a hole.The amplitude of S-wave is larger,but the amplitude of Stoneley is smaller,and velocity also,which separate from S-wave.
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Received: 20 March 2001
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2002, Vol. 37 
