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双发双收声波测井仪发射晶体向四周发射声波,在井内和地层中激发出各种模式的波,沿不同的方向和途径传播,最后由接收晶体接收,形成全波列波形。声速测井记录的是发射同步脉冲到首波的旅行时间,声幅、变密度记录的是声波信号的幅度变化。声波信号的各种变化对测井起着至关重要的作用。
The double transmitting and receiving acoustic logging tool emits the sound wave to the surroundings and excites various modes of waves in the well and the formation. The waves are transmitted in different directions and paths and finally received by the receiving crystal to form a full wave waveform. Sound velocity logging records the travel time, amplitude and density of the transmitted sync pulse to the first wave as a function of the amplitude of the acoustic signal. Various changes in acoustic signals play a crucial role in logging.