Journal of the Japanese Association for Petroleum Technology

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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.

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With the advancement of science and technology and the expansion of communication a vast amount of data are collected and many techniques have been developed for the data analysis in many field of science. The purpose of data analysis is to extract informations from the data which are large in size and complex in structure. The data analysis is composed of two steps of procedure: the one is to make clear the data structure and the other is to classify and arrange samples in the data. The transformation and display of the data and informations are also included in the data analysis.
The system for the data analysis is closely elated with the computer since the multivariate analysis, one of major techniques of the data analysis, requires a large amount of calculation. In the system the data file, data transformation, file management, display and data processing must be organically combined with each other. We are planning not a single system but a set of systems, that is, the SPSS system in the base and the BMD, BMDP and other library or private programs are in the branches.
Some basic examples of data analysis are given: triangle diagram, scatter diagram, trend surface analysis, factor analysis and cluster analysis.
We are hoping that the data analysis will be widely applied and helps researchers in many fields of geology.

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