波谱学杂志2013，Vol.30Issue(1)：103-112,10.
核磁共振测井受激回波校正方法研究
A Method for Correcting of the Effects of Stimulated Echo in NMR Logging
宋公仆 1范伟 1张嘉伟 1薛志波 1吴磊1
作者信息
摘要
Abstract
The CPMG sequence is the most widely used pulse sequence in NMR logging. However, the formation of stimulated echo will distort the first two echoes acquired with the CPMG sequence, affecting the signal-to-noise ratio (SNR) of logging tools and the outcome of reservoir evaluation. To improve the performance of NMR logging tools, a correction method for stimulated echo was proposed, based on theoretical studies on the how the stimulated echoes are formed and what are their effects on CPMG acquisition. Because the radio frequency (RF) field generated by a RF pulse might vary by the load, a relationship between stimulated echo correction coefficient and the RF field was established to calibrate the CPMG measurement made under different environment. With real logging data of low SNR, the correction method proposed resulted a measurement error of 4. 9%, which was a significant improvement from a 24. 6% measurement error resulted from the traditional cast-out-the-first-two-echoes correction method.关键词
核磁共振测井/受激回波/CPMG脉冲序列/射频场强Key words
NMR logging； stimulated echo； CPMG sequence； radio frequency pulse分类
数理科学引用本文复制引用
宋公仆,范伟,张嘉伟,薛志波,吴磊..核磁共振测井受激回波校正方法研究[J].波谱学杂志,2013,30(1):103-112,10.
