%0 Journal Article
%T Quality factor extraction using instantaneous frequency at envelope peak of direct waves of VSP data<br>利用VSP资料直达波的包络峰值处瞬时频率提取介质品质因子
%A GAO Jing-Huai
%A YANG Sen-Lin
%A WANG Da-Xing
%A <br>高静怀
%J 地球物理学报
%D 2008
%I 
%X In the work,employing a function with four undetermined parameters to model the source wavelet,an analytical relation between Q-factor and envelope peak instantaneous frequency(EPIF)is derived from the theory of one-way waves propagating in an anelastic medium;at the same time,a method for extracting instantaneous frequency(IF)in wavelet domain is developed for improving the precision and anti-noise performance of IF estimation,and based on these,a method called EPIF in wavelet domain(WEPIF)is proposed for estimating Q-factor of VSP data.Test of synthetic zero-offset VSP data indicates that,comparing with logarithm spectral ratio method and centroid frequency shift method,WEPIF method is more stable and precise,and less sensitive to interface reflection waves.The Q-factors of single-shot zero-offset VSP data of 6-series from a certain gas field is estimated by WEPIF method,and the result shows that the extent of absorption corresponds well to the gas saturation of reservoirs.
%K Attenuation
%K Quality-factor
%K Instantaneous frequency(IF)
%K Wavelet transform
%K Envelope peak instantaneous frequency(EPIF)<br>衰减
%K 品质因子
%K 瞬时频率
%K 小波变换
%K 包络峰值处瞬时频率
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=C4336CCDCE0B80BFD211FD77350D142A&yid=67289AFF6305E306&vid=987EDA49D8A7A635&iid=38B194292C032A66&sid=970314C3B74F6C4D&eid=0B757E9DCA0EC579&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=0&reference_num=29