阵列声波测井在套管井中的应用研究

Application Research of Array Acoustic Logging in Cased-holes

声波测井资料是地层对比、完井解释的重要资料。结合实际阵列声波测井资料,从下套管前后测得的全波波形的差异来区分套管波和地层纵波,采用慢度-时间相关法(STC)提取地层纵波,对比了在不同水泥胶结质量、套管状况和井眼条件下的套管井与裸眼井声波测井资料,归纳出了过套管声波测井的使用条件和局限性,指出地层全波信息的获取应采用的测量模式和测井质量的影响因素。该研究成果在塔里木油田测井应用过程中取得了良好的效果。

Acoustic logging data were important in stratigraphic correlation and completion interpretation. The casing wave and formation of compressional wave were distinguished by the waveform difference between open hole and cased hole with the practical array acoustic data,and the formation of compression wave can be extracted by STC (slowness-time coherence) method. The acoustic logging data between bore hole and cased hole were compared under the condition of different qualities of cement bond,casings and the hole conditions and the application and limitation of acoustic logging in cased wells were obtained. It is pointed out that the influencing factors of measuring mode and logging quality are used to obtain formation of full wave data. The results are used in the logging in Tarim Oilfield and good effects are obtained.