权重τ-p变换阵列声波处理方法及其在套管井中的应用  

Weightτ-p Transform Method in Array Acoustic Signal Processing and Its Applications to Cased-Hole Acoustic Logging

作　　者：程小康 李宁 何秋凯 苏孝勇 唐晓明 CHENG Xiaokang;LI Ning;HE Qiukai;SU Xiaoyong;TANG Xiaoming(School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China;Production Logging Center, China Petroleum Logging CO. LTD., Xi’an, Shaanxi 710077, China;Changqing Branch, China Petroleum Logging CO. LTD., Xi’an, Shaanxi 710201, China;Southwest Branch, China Petroleum Logging CO. LTD., Chongqing 400021, China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石油集团测井有限公司生产测井中心,陕西西安710077 [3]中国石油集团测井有限公司长庆分公司,陕西西安710201 [4]中国石油集团测井有限公司西南分公司,重庆400021

出　　处：《测井技术》2020年第6期565-569,共5页Well Logging Technology

摘　　要：在胶结质量差的井孔中进行过套管声波测井时,沿钢套管传播幅度较强的套管波会严重干扰接收器采集的地层信号,导致其信噪比降低,给地层声速的提取带来困扰。基于τ-p变换原理,提出一种权重τ-p变换阵列声波信号处理方法。该方法利用最小二乘τ-p变换将时域的声波数据转换至τ-p域,根据套管波和地层波的分布特征,创建合适的权重值,对τ-p域中每个数据元素进行加权,能够压制套管波的波场能量,并使地层波的波场能量收敛集中,达到提升地层信号信噪比的目的。通过对理论模拟数据和现场测井数据的应用,证明了该方法的有效性。该方法为过套管阵列声波测井信号处理提供了一种新的处理方法。In cased-hole acoustic logging,the casing wave will be generated in poorly bonded cased boreholes,propagating along the steel pipe.In this situation the acoustic logging waveforms are often contaminated by casing waves,making it difficult to extract formation acoustic velocity from the acoustic data.Based on the principle ofτ-p transform,this study presents a method for weightτ-p transform in array signal processing.This method converts the time domain data of acoustic logging to theτ-p domain by the least squareτ-p transform,then this domain consists of casing wave field and formation wave field.Depending on two kinds of wave field distribution characteristics we create the appropriate weights,weighting each data element of theτ-p domain,so as to suppress casing wave energy and concentrate the formation wave energy,then the signal-to-noise ratio of formation signal is improving.By the applications to synthetic waveform data and cased-hole acoustic logging data,it is proved that this method can effectively suppress the casing wave and improve the signal-to-noise ratio of formation signal and accurately extract the formation acoustic velocity.This paper provides a new processing method for acoustic logging data of cased-hole.

关 键 词：套管井 声波测井 套管波 地层声速 权重τ-p变换 

分 类 号：P631.84[天文地球—地质矿产勘探]