Abstract
Four types of sonic log tools were tested in the same borehole drilled in a hard formation. One is the suspension type P-S logging tool with a dipole source and two receivers. Second one is a conventional full wave sonic tool with two monopole transmitters and three receivers. The third is a newly developed full wave digital sonic tool with two monopole sources and two receivers, and the fourth is an array sonic tool with two transmitters and twelve receivers. The former two tools transmit analog signals through the cable and convert the data digitally in the surface equipment, whereas the latter two transmit digital data converted using 12 bit A/D boards incorporated in the probe to the surface unit. All tools are available in the slim hole with diameter from 66mm to 120mm. The result of field measurement showed the obtained Vp profiles coincided well with each other, and careful discrimination of waveform taking account the tool characteristics is important for the precise analysis. Obvious attenuation of the Stoneley wave was observed at fracture zone recognized with a borehole video image tool.
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