纵横波品质因子AVO反演方法研究

项目名称： 纵横波品质因子AVO反演方法研究

项目编号： No.41604108

项目类型： 青年科学基金项目

立项/批准年度： 2017

项目学科： 天文学、地球科学

项目作者： 李传辉

作者单位： 中国地质大学（北京）

项目金额： 15万元

中文摘要： 品质因子（Q）参数的准确估计在地震勘探中具有重要的意义，利用黏弹性介质的AVO特性进行品质因子的反演已经成为获得高分辨率品质因子参数的新途径。现有的黏弹性介质的AVO反演将纵横波品质因子当作与纵横波速度与密度等并列的参数进行同步反演，使AVO反演的参数个数增加，加大了反演结果的不确定性。因此，本项目从重新推导与品质因子有关的黏弹性介质反射系数公式入手，研究一种黏弹性介质的品质因子反演与速度反演的分离方法。在弱黏弹性介质条件下，先进行地震信号主频下的纵横波参考相速度反演，然后在参考相速度已知的条件下再进行品质因子的频散AVO反演，从而达到获取稳定可靠的品质因子参数的目的。基于以上研究内容，本项目将建立一套从实际数据中获取纵横波品质因子参数的流程，这对于提高地震资料的分辨率特别是对储层的识别及特征描述等有重要的理论意义和实际应用价值。

中文关键词： 品质因子；AVO反演；黏弹性介质；确定性

英文摘要： Accurate estimate of Q-factor is of great importance in seismic exploration. Q-factor inversion using the AVO characteristics of viscoelastic media has become a new method to obtain high resolution Q-factor. The existing AVO inversions in viscoelastic media take the P- and S- wave quality factor as the paratactic parameters with the P- and S- wave velocity and density to perform simultaneous inversions, increasing the number of parameters of AVO inversion, and therefore the uncertainty of the inversion results is enhanced. Hence, started with re-deriving the formula of the reflection coefficient related to Q-factor in viscoelastic media, this project will perform research on the separation of Q-factor inversion and velocity inversion. Under the condition of weak viscoelastic media, the P- and S- reference phase velocity are first inverted, and then the dispersive AVO inversion of Q-factor is performed under the condition of known reference phase velocity, obtaining stable and reliable Q-factor. Based on the above research, this project will develop a set of process of obtaining P- and S- wave Q-factor from actual data. This has important theoretical and applicative value in improving the resolution of seismic data, especially for the identification and characterization of reservoirs.

英文关键词： Quality factor;AVO inversion;Viscoelastic media;Certainty