天然气地球物理勘探

山前带复杂构造成像中叠前深度偏移方法研究及应用

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  • 1.中国石油勘探开发研究院西北分院,甘肃 兰州 730020;2.成都理工大学,四川 成都 610059

收稿日期: 2009-03-16

  修回日期: 2009-05-30

  网络出版日期: 2009-08-10

Research and Application of Prestack Depth Migration Method in Piedmont Complex Structure Imaging

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  • 1. Research Institute of Petroleum Exploration and Development\|Northwest, PetroChina, Lanzhou 730020, China; 
    2. Chengdu Technology University, Chengdu 610059, China

Received date: 2009-03-16

  Revised date: 2009-05-30

  Online published: 2009-08-10

摘要

西部前陆盆地高陡复杂构造带地震资料的准确成像已经成为制约该类地区地震勘探的瓶颈,传统的地震成像方法由于其自身算法及适应性的限制在这类地区难以准确成像,因此很有必要开展叠前深度偏移方法研究。首先从理论上分析了Kirchhoff积分法叠前深度偏移的原理及优势,介绍了主要技术措施和实现方法;然后针对常规地震资料信噪比低,高陡构造偏移归位困难等问题,实现了一种叠前时间偏移、叠后和叠前深度偏移相结合,运用最佳拟合法准确求取速度模型;最终实现叠前深度偏移,准确落实构造的方法。此外,针对二维测线资料偏移效果,对比分析验证了叠前深度偏移方法在山前带复杂构造成像中的有效性。

本文引用格式

苏勤, 贺振华, 田彦灿, 李斐 . 山前带复杂构造成像中叠前深度偏移方法研究及应用[J]. 天然气地球科学, 2009 , 20(4) : 571 -575 . DOI: 10.11764/j.issn.1672-1926.2009.04.571

Abstract

 Piedmont high and complex structure imaging of the western foreland basin has become bottleneck of seismic exploration. The conventional seismic imaging method couldn't get correct imaging because of the limit of its algorithm and adaptability. We analyses the advantages of pre-stack depth migration of Kirchhoff integral method, and introduce its main techniques. Aiming at such problems as low signal to noise ratio of the normal seismic data, and difficult to migrate high and steep structure and so on, we achieve a method that combines with pre-stack time migration, post-stack depth migration and prestack depth migration, and uses the best fitting method to obtain velocity model exactly, to do pre-stack depth migration, and to achieve actual structure finally. Finally the comparison analysis aiming at 2D survey lines of piedmont zone confirms the effectiveness of the pre-stack depth migration method for piedmont complex structure imaging.

参考文献

[1]熊煮.复杂地区地震数据处理思路[M].北京:石油工业出版社,2002.
[2]贺振华,Lai J,Gardner  G H F,等.多次覆盖地震资料的叠前偏移[J].石油地球物理勘探,1986, 21 (1):11-22.
[3]田彦灿,苏  勤,王小卫,等.三维叠前深度偏移在CX气田的应用[J].天然气地球科学,2005,16(2):242-245.
[4]王红旗,曲寿利,宁俊瑞,等.高精度叠前时间偏移技术在川西地区的应用[J]. 天然气地球科学,2007,18 (6):803-807.
[5]叶勇,郑雄.偏移速度分析技术新进展[J].勘探地球物理进展,2003,26(2):136-142.
[6]张建伟, 鲁烈琴, 强芳青, 等.二维叠前深度偏移连片处理及成像建模技术[J] .天然气地球科学,2003,14(3):203-206.
[7]杨长春,刘兴材,李幼铭,等.地震叠前深度偏移方法流程及应用[J].地球物理学报,1996,39(4):409-415.

 

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