A Method of Fitting Function to Extract Phase Slowness of Dispersive Wave from Sonic Logging Data
详细信息
- 责任者：Sun Zhifeng (Oildfiel Technical Group ; China Oilfield Services Limited ; Beijing 101149 ; China) ; Fan Guanmin
- 刊名：Journal of Jilin University
- 出版年：2011
- 卷期：41(4)
- 关键词：声波测井 ; acoustical logging
- 页码：p.1239-1245
- 图表：5 illus., 1 table, 11 refs.
- 分类号：1600
- issnNo：ISSN1671-5888
- isbnNo：CN22-1343/P
摘要
The authors present a method to extract the phase slowness from dispersive waves provided by sonic logging. 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.