全走时反演及其应用

发布时间：2018-04-05 07:41

本文选题：波动方程　切入点：速度建模　出处：《石油物探》2017年01期

【摘要】：波动方程速度建模方法是利用地震数据或成像道集中的旅行时信息或运动学特征自动反演出背景速度模型,但是已有方法普遍面临一个严重的问题,即反演过程无法避免受振幅信息的影响。为此,提出了一种基于波动方程的旅行时反演方法,称之为全走时(即完全依赖于走时信息)反演,从地震数据中自动估计出运动学意义上正确的速度模型,其核心思想是使反演完全依赖于走时信息,从而防止反演受到振幅信息的干扰。基于速度扰动只产生旅行时变化这一假设,介绍了数据域和成像域两种全走时反演方法,分别对应透射波和反射波走时反演。全走时反演不需要准确的初始速度模型和地震数据中的低频信息。理论模型和实际资料测试结果表明,全走时反演在常速度初始模型的情况下也能得到令人满意的反演结果。
[Abstract]:Wave equation velocity modeling method is to use travel time information or kinematics features of seismic data or imaging trace set to automatically reverse the background velocity model, but the existing methods generally face a serious problem.That is, the inversion process can not be avoided by amplitude information.Therefore, a travel time inversion method based on wave equation is proposed, which is called full travel time inversion (that is, totally dependent on travel time information), and automatically estimates the correct velocity model in the sense of kinematics from seismic data.Its core idea is to make the inversion completely dependent on the traveling time information, so as to prevent the inversion from being interfered with by the amplitude information.Based on the assumption that velocity disturbance only produces travel time variation, two full travel time inversion methods in data domain and imaging domain are introduced, which correspond to transmission wave and reflection wave respectively.Full travel time inversion does not require accurate initial velocity model and low frequency information in seismic data.The theoretical model and practical data test results show that the full travel time inversion can also obtain satisfactory inversion results in the case of the initial model of constant velocity.
【作者单位】：沙特阿美北京研发中心;沙特阿美EXPEC高级研究中心;
【分类号】：P631.4

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