CAJ | 학술논문

本文首次给出了一种利用扫描分析技术与广义S变换时频分析工具相结合求取介质品质因子(Q值)的方法,与传统的Q值估计方法不同,该方法用一系列等效Q值对叠前衰减数据进行粘性补偿偏移,将偏移后的共反射点道集叠加,利用广义S变换求取补偿后叠加道的时频谱和傅立叶峰值频率,以浅层强反射界面子波时频谱为参考,它他深度处地层子波的时频谱特征与之进行比较,当谱宽和峰值频率达到一致作为正确Q值选定标准,确立了宏观介质的等效Q值分析新方法.
본문수차급출료일충이용소묘분석기술여엄의S변환시빈분석공구상결합구취개질품질인자(Q치)적방법,여전통적Q치고계방법불동,해방법용일계렬등효Q치대첩전쇠감수거진행점성보상편이,장편이후적공반사점도집첩가,이용엄의S변환구취보상후첩가도적시빈보화부립협봉치빈솔,이천층강반사계면자파시빈보위삼고,타타심도처지층자파적시빈보특정여지진행비교,당보관화봉치빈솔체도일치작위정학Q치선정표준,학립료굉관개질적등효Q치분석신방법.
A new method of determining effective Q is presented for the first time which is combined with the generalized S transform and scanning analysis technique. It differs substantially from traditional Q estimation methods in that prestack time migration is adopted to compensating for seismic data, which has been attenuated as a result of intrinsic absorption, by using a series of effective Q factors. Common reflection point gathers are stacked in order to form the stacked profile. A stacked trace chosen from the stacked profile is analyzed by using generalize S transform to gain the time-frequency spectrum and peak frequency of Fourier spectrum. A shallow strong reflection can be selected as a reference time-frequency spectrum. This reference spectrum is compared with the target reflection at different depths. A standard is established for choosing accurately effective Q when the spectrum width and peak frequency of Fourier spectrum are consistent with reference spectrum. As a result, a new technique for analyzing effective Q of macro-media is established.