一种多通道声波测井信号频散分析方法  

A Multi-channel Acoustic Logging Signal Dispersion Analysis Method

作　　者：王瑞甲[1,2] 乔文孝[1,2] 鞠晓东[1,2] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]北京市地球探测与信息技术重点实验室,北京102249

出　　处：《测井技术》2012年第2期135-140,共6页Well Logging Technology

基　　金：国家自然科学基金项目(批准号:10534040;40874097);国家油气重大科技专项(课题号:2011ZX05020-009)资助

摘　　要：声波测井中沿着井轴方向传播的模式波,包括斯通利波、伪瑞利波、弯曲波和螺旋波均为频散波。模式波的频散特征中包含大量与地层性质相关信息。通过对声波测井信号频散特征的分析,提出一种新的多通道声波信号频散分析方案。该方案首先通过修改的矩阵束方法获取模式波的速度及衰减信息,采用自适应的模式波标定方法和参考速度范围计算出慢度频率相关图,通过对慢度频率相关图的加权处理和对极值的标定,得到优化的频散曲线。与现有方法相比,该方案计算的慢度频率相关图不存在伪解,获取的频散曲线也更为稳定和可靠。理论合成的多极子声波测井波形及现场测量数据的处理结果均验证了该方法的可靠性。The mode waves propagating along borehole axis including the stoneley waves, pseudo- Rayleigh waves, flexural waves and screwed waves, are all dispersive waves. The dispersion characteristic of mode waves contains lots of information related to the formation properties. Pro- posed is a multi-channel acoustic signal dispersion analysis method based on analyzing characteris- tic of acoustic logging data. In the proposed method, firstly the velocity and attenuation of the mode waves are obtained from the modified matrix-pencil method, then slowness frequency corre- lation （SFC） map is worked out with adaptive mode waves demarcation method and reference ve- locity range, at last optimized slowness dispersion curves are obtained from the SFC map weight and the maximum value. The proposed method eliminates the aliasing effect on the SFC map, and the dispersion curves are stable and reliable compared with the existing methods. The proposed method is verified by the processing of synthesized multi-pole acoustic logging waveforms and field data application.

关 键 词：声波测井 信号处理 模式波 频散分析 多极子 矩阵束方法 伪解 多通道 

分 类 号：P631.84[天文地球—地质矿产勘探]