超音波テレビジョン検層に関する基礎研究

抄録

The Borehole Televiewer (B. H. T. V.) logging had been developed to inspect boreholes and to evaluate visually fractured reservoirs by Mobil Research & Development Corp. in 1969. Now, this method has been adopted as a practice of new acoustic logging in Schlumberger Co. As we took an interest in this problem, following experiments have been studied and discussed in this paper.
One of them was attenuation measurement of acoustic energy in several muds which were composed with bentonite and barite in any ratio. The attenuation in these muds was almost proportional to the thickness of solids regardless of the kind of compornent.
Another experiment was carried out to dicide the reflection coefficient of rock in water. In general, amount of energy reflected from surface depended upon physical properties, roughness and acoustic impedance of boundary materials. In this experment, the proper reflection coefficent might be decided by means of extrapolating on-to zero distance from surface in where no one differences of reflection pulse intensities were found owing to surface physical conditions.
In application research, BHTV model apparatus was consisted by Toshiba Electric Co. The typical method, C scope, was applied to artifical boreholes and also P.P.I (plane position indication) scope methods had been developed in same model. The descriptive results were shown in photographs of this paper.