相量感应线圈系地层识别能力的改善

Improvement for the Vertical Resolution of Phasor Induction Logging Sonde

相量感应测井的关键在于同时精确测量Ｒ信号和Ｘ信号，利用相量反褶积反演地层参量。本文采用自适应滤波法对线圈系在平面成层介质中的响应场进行快速求解；基于几何因子理论用最小平方滤波法设计出了相量反褶积中的三个滤波因子。对模拟地层反演计算结果表明，在较大的电导率范围内，基本上消除趋肤效应影响，有效地改善了线图系的薄地层识别能力。

The key to the phasor induction logging is to measure precisely R-signals and X-signals aimulataneously and to inverse the formation parameters by means of the phasor deconvolution. By using the adaptive digitalfiltering method,numerical integration of responsing field of the sonde in plane stratified media has been carried out.Also, three filter factors in the phasor deconvolution algorithm have been designed by using the least Square technique based on the geometrical factor theory.The computed results for the simulate formation beds presented in thispaper show that the allin effect is mostly removed over a wide range of conductivity and the vertical resolution of thesonde is apparently improved.