在综合测井曲线中,超声波时差曲线是计算层速度、砂岩孔隙率和解释岩性不可缺少的一条曲线。实践证明,它还可作为地震测井曲线的补充。时差曲线从道理上讲,可以从井底一直测到地面。但从经济效益着眼,从井底一直测到地面是不合算的。通常探井都测至上下第三系的分界面附近。所以,为了把时差曲线 In the integrated logging curve, the ultrasonic time difference curve is an indispensable curve for calculating the layer velocity, sandstone porosity and interpretation of lithology. Practice has proved that it can also be used as a supplement to the seismic logging curve. Time Lag Curve Logically speaking, you can measure the ground from the bottom of the well. However, from the perspective of economic efficiency, the ground has been measured from the bottom of the well is uneconomical. Exploration wells are usually measured up and down the Tertiary interface near the interface. So, in order to put the time difference curve