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针对单道超声反射式水泥胶结测井 ,从理论方法上研究如何从一维反射资料反演第一界面窜槽时水层的厚度 .通过选择套管共振透射窗 ,提高目的层有用信号的信噪比 .内层介质 (水和水泥 )厚度出现在声波相应介质层的相移φ(ω) =nπ+φ0 (ω)中 ,利用多个频率点的相移反正切函数主值给出相应的 n值计算公式 ,并把 n值的整型性作为反演收敛的判据之一 .在已知条件下 ,采用牛顿迭代法对人工合成单道反射波信号反演了窜槽水层厚度 ,在模拟实际窜槽水层厚度为 1 mm和 3mm情况下 ,均得到满意的结果 ,而且反演结果的精度对初值的选择不敏感 ,表明反演方法可行
Aiming at the single-channel ultrasonic reflection cement cementing logging, how to retrieve the thickness of the water layer when the first interface is channeling from the one-dimensional reflection data is theoretically studied. By choosing the resonant transmission window of the casing to improve the signal of the useful signal of the target layer Noise ratio The thickness of the inner medium (water and cement) appears in the phase shift φ (ω) = nπ + φ0 (ω) of the corresponding dielectric layer of the acoustic wave, using the principal values of the phase shift arctangent function for a plurality of frequency points , And takes the integral of n value as one of the criteria for inversion convergence.Using Newton iteration method, the thickness of channeling aquifer , The simulation results of the actual channeling water layer thickness of 1 mm and 3 mm case, are satisfactory results, and the accuracy of the inversion results are not sensitive to the choice of initial value, indicating that the inversion method is feasible