基于Choi-Williams时频分布的裂缝性地层时频特征  

Time-frequency characteristics of fractured formation based on Choi-Williams energy distribution

作　　者：杨闯[1] 王祝文[1] 向旻[1] 刘菁华[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《世界地质》2015年第3期825-829,共5页World Geology

基　　金：国家重点基础研究发展计划项目(2012CB822002)

摘　　要：为验证Choi-Williams能量分布时频分析方法的有效性,将其引入阵列声波测井信号处理之中。结果表明,它对于裂缝性地层具有较好的区分和识别能力,并且可以有效地抑制多频率成分信号的交叉性干扰,清晰地得到声波测井信号的时频分布性能及其特征。对于致密性地层来说,声波测井信号的各组分波均无明显的衰减。对于裂缝性地层来说,斯通利波能量会有较大幅度的衰减;破碎度更好,渗透性越好的裂缝对斯通利波的衰减影响更大;横波的衰减在渗透性更好的裂缝中更加明显。In order to verify the validity of Choi-Williams energy distribution time-frequency analysis method,it is used for signal analysis of array acoustic logging. The study shows that it has a good ability to identify and distinguish the fractured strata and can suppress the cross interference of the multi frequency component signal effectively,and get the time-frequency distribution and characteristics of the acoustic logging signal. In the compact rock strata,all the waves of acoustic logging signal have no obvious attenuation. In the fractured strata,the energy of Stoneley wave will be attenuated greatly. The better fragmentation and permeability of fracture are,the greater effect it has on attenuation of Stonely wave. The attenuation of S-wave is more obvious in a fracture with better permeability.

关 键 词：时频分布 Choi-Williams能量分布 裂缝性地层 

分 类 号：P631.5[天文地球—地质矿产勘探]