天然气勘探

波动方程叠前偏移在碳酸盐岩成像中的应用研究

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  • 1.中国地质大学,湖北  武汉  430047;
    2.中国石油勘探开发研究院西北分院,甘肃   兰州 730000
王小卫(1967-),男,甘肃临夏人,高级工程师,在读博士,主要从事碳酸盐岩地震资料处理方法研究.

收稿日期: 2010-11-24

  修回日期: 2011-06-20

  网络出版日期: 2011-10-10

Application of Wave Equation Prestack Migration in Carbonate Imaging

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  • 1.China University of Geosciences,Wuhan 430074,China;
    2.Northwest Branch of Resarch Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730000,China.

Received date: 2010-11-24

  Revised date: 2011-06-20

  Online published: 2011-10-10

摘要

叠前偏移是解决强横向变速情况下复杂构造成像的一种有效手段,在碳酸盐岩成像处理研究中,利用波动方程叠前偏移较叠后偏移能获得分辨率高、保幅性好的偏移成果,孔洞能得到很好的刻画,串珠聚焦程度好,归位更加合理,能真实反映地下的构造形态,提高碳酸盐岩岩溶地形的地震预测成功率。对时间偏移和深度偏移在理论方法、适用性和处理剖面效果方面进行了分析对比,在地下构造复杂或横向速度变化较大时,叠前深度偏移能获得更好的效果。速度建模是影响叠前偏移成像技术的核心问题之一,获得准确的层速度是叠前深度偏移成功的关键。

本文引用格式

王小卫, 姚姚, 刘文卿, 王艳香 . 波动方程叠前偏移在碳酸盐岩成像中的应用研究[J]. 天然气地球科学, 2011 , 22(5) : 874 -877 . DOI: 10.11764/j.issn.1672-1926.2011.05.874

Abstract

Prestack migration has been an effectively method in some areas with complicated structure and dramatic lateral variation in velocity.In comparison with the wave equation pre-stack migration method to post migration method,the pre-stack migration method in seismic imagery processing of fracture-cave in carbonate rock has ability to obtain high resolution and amplitude-preserved migration results,finely portray the fracture-cave,and highly draw a string of beads.The migration results can reflect real structure underground and enhance the success rate of seismic prediction in carbonate karst area.We compare the pre-stack time migration method with the pre-stack depth migration method in theory,applicability and processing seismic section,and find out that the pre-stack depth migration method can obtain the profitable result in some areas with complicated structure and dramatic lateral variation in velocity.Velocity modeling is an important technique in wave equation pre-stack depth migration,so an accurate interval velocity is a key for wave equation pre-stack depth migration.

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