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目前的声波测井方法主要是声速测井,声幅测井和全波列声波测井(变密度声波测井)。这三种方法所利用的是地层滑行纵波、套管波(可能有Lamb波)和沿井壁传播的地层Rayleigh波。这些声波的传播方向都平行并轴。利用平行井轴的声波进行测井,是目前声波测井的传统方式。本文试图突破这一传统,设法利用垂直井轴的声波进行测井,使Rayleigh波沿井壁作环形传播,其路径近似正园,园心在井轴上。Rayleigh波是面波,具有沿曲面传播的性能。这种利用Rayleigh波沿井壁作环形传播的测井方法,在国内外资料中尚未见到,本文哲称之为Rayleigh波环形传播测井。
The current sonic logging method is mainly sound velocity logging, sound amplitude logging and full wave acoustic logging (variable density acoustic logging). These three methods utilize stratigraphic gliding waves, casing waves (possibly with Lamb waves) and stratigraphic Rayleigh waves propagating along the borehole wall. The direction of propagation of these sound waves are parallel and axis. The use of acoustic logging parallel to the shaft axis is the traditional method of acoustic logging. This paper attempts to break through this tradition and try to use the vertical axis of the sound wave logging, the Rayleigh wave circulating around the borehole wall, the path is similar to the park, the center of the shaft in the shaft. Rayleigh waves are surface waves that propagate along curved surfaces. This method of logging using Rayleigh waves along the borehole wall for annular propagation has not been seen in domestic and foreign literature and is referred to as Rayleigh ring propagation logging.