长源距声波测井在固井界面胶结探测中的应用

APPLICATION OF LONG SPACING SONIC LOG IN THE DETECTION OF INTERFACE BOND OF CEMENTING

长源距声波测井在套管井内可以探测固井后套管与水泥环（简称固井I界面），水泥环与地层（简称固井Ⅱ界面）的胶结情况，但是必须对长源距声波测井波形进行处理，分辨出相应的导波，本文给出了长源距声波测井波形小波处理结果，结合理论计算结果识别套管井固井I，II界面的胶结情况以及同位素测井验证实例。

Long spacing sonic log can detect the bond between casedholes and annular cement (as Ⅰ interface of cementing) and the bond between annular cement and formation (as Ⅱ interface) in the casedhole. It is necessary to process the waveforms of long spacing sonic logs and identify the associated guide waves. The results are presented in the paper relating to the processing of the wavelets of long spacing sonic log waveforms and the bond between interface Ⅰ and interface Ⅱ in the casedhole can be identified by combining the computed theoretical results and finally the experienced case of the isotopic logging is given.