测井技术2025，Vol.49Issue(4)：549-556,8.DOI:10.16489/j.issn.1004-1338.2025.04.007
一种过套管阵列声波时差的自适应提取方法
Adaptive Extraction Method for Array Acoustic Slowness in Through-Casing Logging
摘要
Abstract
To overcome the difficulty of extracting formation acoustic slowness in cased holes when the casing and formation are poorly cemented,and to address the limitation that existing methods rely on prior information such as accurate borehole parameters or manual parameter adjustment,an adaptive extraction method based on the fixed slowness characteristics of casing waves is adopted:casing waves are predicted and initially removed through wavefield separation,an adaptive weighting strategy is introduced to protect formation wave features,data reconstruction technology is combined to enhance waveform redundancy,and finally,formation slowness behind casing is extracted through slowness-time coherence(STC)or dispersion analysis.The research results show that:①The method has been verified by numerous vertical and horizontal well cases,overcoming the difficulty of signal extraction in poorly cemented conditions and providing a reliable means for extracting slow formation signals.②It can reliably extract formation slowness characteristics even when the formation compressional wave slowness is close to that of the casing wave and the main features of the formation wave are masked.③It can recover more details of formation wave slowness,significantly improve the signal-to-noise ratio of effective signals,and enhance waveform redundancy.④It can separate formation compressional and shear waves,improving the accuracy of slowness extraction.It is concluded that the method has good adaptability,does not require adjustment of time window and frequency parameters,can effectively solve key problems in extracting formation acoustic slowness in cased holes,and has on-site promotion and application value.关键词
套管井/声波时差/自适应提取/套管波/地层信号/波场分离/数据重建/慢度估算Key words
cased hole/acoustic slowness/adaptive extraction/casing wave/formation signal/wavefield separation/data reconstruction/slowness estimation分类
天文与地球科学引用本文复制引用
张永超,吴琴琴,姜黎明,孙学凯,赵子萌,张然,张立,张嘉庆..一种过套管阵列声波时差的自适应提取方法[J].测井技术,2025,49(4):549-556,8.基金项目
国家重点研发计划课题"声波换能器测试和工程应用"(2023YFF0720702) （2023YFF0720702）
中国石油天然气集团有限公司青年科技专项课题"测井声波多模态自动解析与弱观测成像技术研究"(2024DQ03120) （2024DQ03120）
