Theoretical Study on Characteristic of Weak Signal and Its Identification
详细信息
- 责任者：Han Wengong (Shengli Oilfield ; SINOPEC ; Dongying 257000 ; China) ; Zhang Junhua
- 刊名：Oil Geophysical Prospecting
- 出版年：2011
- 卷期：46(2)
- 关键词：地震勘探 ; seismic exploration
- 页码：p.232-236
- 图表：9 illus., 8 refs.
- 分类号：1600
- issnNo：ISSN1000-7210
- isbnNo：CN13-1095/TE
摘要
Seismic weak signal is a real big challenge for seismic explorations. Based on amplitude characteristics of seismic weak signal in thick and thin layers, this paper analyzes the spectrum characteristics of seismic weak signal as well as the influence of noise on it. The results indicate that: 1) it is basically impossible to detect weak signal by visual recognition when S/N<0. 5; 2) for thin reservoirs, the tuning thickness could be identified if the S/N is 2; 3) the spectrum of the weak signal involved in the adjacent strong reflection cannot show its characteristic; and 4) horizontal weak events mixed with noise can be effectively detected by the SVD method while non-horizontal weak events mixed with noise can be detected.