关键词: 反演, 参数, 剖面对比, 定量分析, 综合解释

Abstract: AVO lithologic parameters can be inverted with the help of Aki and Richards formula and the Singular Value Decomposition(SVD) method.Inversion can provide following sections:Zero-offset reflectivity section of p-wave,reflectivity section of S-wave,relative velocity sections of p-wave and S-wave, identification sections of gas sandstone. P-wave and S-wave velocities,used in reservoir prediction and detection. Synthetic sonic log can be obtainedby sampled S-wave section,a procession of the synthetic accoustic profile obtained through acombination of Zero-offset,P-wave profile and the resample reflective S-wave profile relationships between p-wave and S-wave velocities in clastic rocks,clay contents and porositiesare estimated and their sections are achieved.The paper shows the application of these sections in geological interpretations and detection of gas sandstone which have different AVO characteristics. Case study has confirmedthat the qualitative to quantitative interpretation methods are effective.

Key words: inversion, parameter, profile correlation, quantitative analysis, comprehensive interpretation