地球物理学进展 ›› 2019, Vol. 34 ›› Issue (1): 64-68.doi: 10.6038/pg2019CC0004

• 应用地球物理学Ⅰ(油气及金属矿产地球物理勘探) • 上一篇    下一篇

利用正演技术识别地震解释中的假象

邓国成1,2   

  1. 1. 河南省煤田地质局物探测量队,郑州 450009
    2. 河南省地质物探工程技术研究中心,郑州 450009
  • 收稿日期:2018-05-08 修回日期:2018-11-06 出版日期:2019-02-20 发布日期:2019-04-15
  • 作者简介:邓国成,男,1978年生,湖南衡阳人,高级工程师,主要从事地球物理勘探的应用研究.(E-mail: 5570448@qq.com)
  • 基金资助:
    河南省国土资源厅2009年度地质矿产科技攻关项目资助.(2010年61号-17)

Using forward modeling technique to identify the illusion in seismic interpretation

DENG Guo-cheng1,2   

  1. 1. Geophysical Exploration and Surveying Team of Coal Geology Bureau of Henan Province, Zhengzhou 450009,China
    2. Henan Geological and Geophysical Engineering Research Center,Zhengzhou 450009,China
  • Received:2018-05-08 Revised:2018-11-06 Online:2019-02-20 Published:2019-04-15

摘要:

绕曲、小型地堑以及陷落柱在地震时间剖面上地震特征容易混淆,相互之间不易识别从而形成地震假象,给地震构造解释带来的困惑.为了识别这些地质现象在地震时间剖面上的真实反映.通过利用正演模拟技术研究这些地震假象的识别方法,采用地质资料设计不同地质现象的地震模型,正演分析了在叠加、叠后偏移和叠前偏移等地震时间剖面上的响应特征以及采用不同初始迭代速度模型处理的叠前偏移剖面上的特征.认为通过分析地震绕射波的响应特征、采用适合的初始迭代速度进行叠前时间偏移处理可以分辨出这些地震假象.最后利用地震勘探实例对总结方法的效果进行了验证.

关键词: 正演, 地震假象, 构造, 陷落柱, 地震解释

Abstract:

The seismic characteristics of the bending, small graben and collapse columns are easy to be confused in the seismic time profile. It is not easy to identify each other, thus forming the seismic illusion and causing confusion to the structural interpretation.In order to identify the real reflection of these geological phenomena on the seismic time profile.The identification methods of these seismic artifacts are studied by using forward modeling techniques,Seismic models of different geological phenomena are designed with geological data,The response characteristics of seismic time profiles such as superposition, post-stack migration and pre-stack migration are analyzed and the characteristics of pre-stack migration profiles processed by different initial iteration velocity models are described.It is concluded that these seismic illusions can be distinguished by analyzing the response characteristics of seismic diffraction waves and using the appropriate initial iteration speed for pre-stack time migration.Finally, an example of seismic exploration is used to verify the effectiveness of the method.

Key words: Forward modeling, Seismic illusion, Structure, Collapse column, Seismic interpretation

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