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现代地质 ›› 2010, Vol. 24 ›› Issue (5): 986-992.

• 天然气水合物 • 上一篇    下一篇

Kirchhoff 叠前偏移在天然气水合物准三维地震资料处理中的应用

潘文勇1,雷新华1,沙志彬2,张新1,雷新民1,刘豪杰1   

  1. 1.中国地质大学 软件学院,北京100083;2.广州海洋地质调查局,广东 广州510760
  • 出版日期:2010-09-24 发布日期:2012-03-28
  • 作者简介:潘文勇,男,硕士研究生,1986年出生,地球物理学专业,主要从事天然气水合物地震勘探研究工作。 Email:pwy1986921@126.com。
  • 基金资助:

    国家高技术研究发展计划项目(2006AA09A202-02-01)

Application of Kirchhoff Prestack Migration Technology on Interpretation of Quasi Three Dimensional Seismic Data of Gas Hydrate

PAN Wen-Yong1, LEI  Xin-Hua1, SHA  Zhi-Bin2, ZHANG  Xin1, LEI  Xin-Min1, LIU  Hao-Jie1   

  1. 1.School of Software, China University of Geosciences, Beijing100083, China;
    2.Guangzhou Marine Geological Survey, Guangzhou, Guangdong510760, China
  • Online:2010-09-24 Published:2012-03-28

摘要:

在针对天然气水合物的准三维地震资料处理中,由于受观测系统不规则、横向覆盖次数变化剧烈以及空间假频的影响,叠后偏移难以取得良好的效果。本研究从目前天然气水合物准三维地震资料偏移成像研究现状入手,总结了叠后偏移成像存在的问题,对比分析了Kirchhoff叠前偏移和波动方程叠前偏移的原理和特点,认为Kirchhoff积分法受观测系统不规则和横向覆盖次数变化剧烈的影响较小,适合于天然气水合物准三维地震资料叠前偏移处理。并将Kirchhoff积分法叠前偏移应用到南海北部神狐海域天然气水合物准三维地震资料处理中,同叠后偏移处理相比,Kirchhoff叠前偏移处理获得了更好的效果。

关键词: 天然气水合物, 准三维, 叠后偏移, Kirchhoff叠前偏移

Abstract:

In the course of processing quasi three dimensional seismic data of gas hydrate, the effect of poststack migration is unsatisfactory resulting from the influences of the irregularity of geometry, intense changes of folds and spatial aliasing. This paper studied the present development status of migration imaging on interpretation of quasi three dimensional seismic data of gas hydrate, and concluded the problems of poststack migration and analyzed the characteristics of main prestack migration algorithms. It is believed that Kirchhoff integral method is little effected by the irregularity of geometry and intense changes of velocity and is favorable to prestack migration processing of quasi three dimensional seismic data of gas hydrate. Kirchhoff integral method prestack migration was applied to process the quasi three dimensional seismic data collected in Shenhu area in northern South China Sea and obtained better effect than poststack migration.

Key words: natural gas hydrate, quasi three dimension, poststack migration, Kirchhoff prestack migration

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