Seismic Q Estimation by Combinations of Frequency Statistics Attributes
详细信息
- 责任者：Zhao Ning (State Key Laboratory of Petroleum Resources and Prospecting ; China University of Petroleum ; Beijing 102249 ; China) ; Cao Siyuan
- 刊名：Oil Geophysical Prospecting
- 出版年：2013
- 卷期：48(4)
- 关键词：地震勘探 ; seismic exploration ; 频率域分析 ; frequency domain analysis
- 页码：p.545-552
- 图表：15 illus., 1 table, 12 refs.
- 分类号：1600
- issnNo：ISSN1000-7210
- isbnNo：CN13-1095/TE
摘要
The quality factor Q is a main parameter of the characterization of the stratum absorption and attenuation characteristics.The accuracy value of Q has practical significance function to predict concealed lithological gas.We propose a Q estimation approach by combinations of statistical frequency attributes.Considering the amplitude attenuation law in frequency domain,exponential decay term is obtained with Taylor approximate expansion.Then a new method for calculating Q with N-order approximation based on frequency attributes is proposed.According to model tests,2-order approximation offers a high accuracy while there is a certain error with 1-order approximation.Based on the error factor analysis,multi interval fitting formula is proposed as a newer method to improve precision of Q.Due to the stability of the statistical properties,the method based on attribute combination for extracting the Q value is more stable than other methods.Our further study finds that the centroid frequency shift method is an approximate of 1-order approximation attribute combination.
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