CAJ | 학술논문

针对随钻核磁共振测井受到遥传带宽的限制，必须在井下完成关键的谱反演，并以此获得数据量较少的孔隙度、渗透率和流体类型等信息的问题，根据核磁共振回波串信号与原始回波信号不同的频谱特征，提出利用9/7提升小波算法对回波串信号滤波和反演，在此基础上获得了孔隙度信息。研究结果表明，该算法可以有效地提取原始回波串数据中的回波信号，抑制了噪声，将信噪比提高了65％左右，反演结果和孔隙度信息能较好地反映地层属性。
침대수찬핵자공진측정수도요전대관적한제，필수재정하완성관건적보반연，병이차획득수거량교소적공극도、삼투솔화류체류형등신식적문제，근거핵자공진회파천신호여원시회파신호불동적빈보특정，제출이용9/7제승소파산법대회파천신호려파화반연，재차기출상획득료공극도신식。연구결과표명，해산법가이유효지제취원시회파천수거중적회파신호，억제료조성，장신조비제고료65％좌우，반연결과화공극도신식능교호지반영지층속성。
Limited by telemetry bandwidth in NMR logging -while-drilling, the key T2 spectrum inversion needs to be com-pleted in the underground.And the small amount of data, such as porosity, permeability, fluid type and other information is re-quired.Based on the difference between original echo signal spectral characteristics and NMR echo train signal spectral charaiteris -tics, the 9/7 lifting wavelet algorithm was presented .Echo train signal was filtered , and then the inversion was carried out to obtain porosity.The results show that the algorithm effectively extract the echo signal from the original echo string data and suppressing the noise.The signal-to-noise ratio increased by at least 65%.The inversion results and porosity logging can better reflect the actual situation.