Subsurface distribution of acoustic velocities obtained through the Continuoous Veocity Logging is useful for identification, correlation and evaluation of geological formations, and is also used with success to interpret seismic reflectiono records in geophysical words.
The Japan Petroleum Exploration Co., Ltd. has carried out some tentative works in the last two years, to check limits of adaptability of this tool to oil-field development works in Japan.
In this paper an attempt will be made to give an outline of the Velocity Surver.
