一种提取声波测井频散波相慢度的适应函数方法  

A Method of Fitting Function to Extract Phase Slowness of Dispersive Wave from Sonic Logging Data

作　　者：孙志峰[1] 樊官民[1] 孟杰[1] 

机构地区：[1]中海油田服务股份有限公司油田技术事业部,北京101149

出　　处：《吉林大学学报（地球科学版）》2011年第4期1239-1245,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家重大专项项目(2011ZX05020-005);国家'863'计划项目(SQ2010AA0920229001)

摘　　要：提出了一种对声波测井频散波数据频散校正的适应函数方法。通过提取频散波的频率慢度相关图,得到频散波的频散曲线,由频散曲线在慢度轴上的投影可得到关于地层波慢度的统计直方图。构造一种适应函数与直方图进行非线性最小二乘拟合,得到与统计直方图最优匹配的适应函数,这个适应函数起始点对应的慢度即为真实的地层波慢度。给出了采用该方法处理理论模拟的偶极子波及现场实测的偶极子波资料的例子。对理论模拟的偶极子波处理,计算的偶极子波慢度值与地层真实横波慢度基本一致;对现场实测的偶极子波数据处理,计算的偶极子波慢度与频率慢度投影曲线相匹配。处理结果表明,采用该方法对频散波进行频散校正是可靠有效的。The authors present a method to extract the phase slowness from dispersive waves provided by sonic logging.The dispersion curve can be acquired by maximizing the frequency-slowness coherence value at each frequency.The projection of dispersion curve on slowness axis is the histogram of formation slowness.The method is based on matching a fitting function to the slowness histogram using method of nonlinear least squares.The slowness of edge location in the best fitting function is the true formation slowness.As an example,the method is employed to process both theoretical dipole wave and field sonic logging data.The phase slowness of dipole wave and the formation slowness are almost the same for theoretical dipole wave;the phase slowness of dipole wave matches with the curve of slowness-frequency projection for field sonic logging data.It is reliable and effective for processing dispersive wave data with this method.

关 键 词：频散波 相慢度 适应函数 直方图 声波测井 

分 类 号：TG156[金属学及工艺—热处理] P631.81[金属学及工艺—金属学]