地球物理学进展 ›› 2018, Vol. 33 ›› Issue (6): 2450-2455.doi: 10.6038/pg2018BB0505

• 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

表面多次波和有效波联合成像

王海娇1,刘玉敏2,林春华3,李星缘1,范垣勋1,石颖1   

  1. 1. 东北石油大学地球科学学院,黑龙江大庆 163318
    2. 东北石油大学电气信息工程学院,黑龙江大庆 163318
    3. 大庆油田有限责任公司勘探开发研究院,黑龙江大庆 163712
  • 收稿日期:2018-04-03 修回日期:2018-10-12 出版日期:2018-12-20 发布日期:2019-03-03
  • 作者简介:王海娇,女,1992年生,在读硕士研究生,现从事基于逆时偏移的表面多次波成像方法分析及应用研究.(E-mail: 13039830613@163.com)
  • 基金资助:
    国家自然科学基金项目(41474118);国家自然科学基金项目(41574117);黑龙江省杰出青年科学基金项目(JC2016006)

Simultaneous reverse time migration primaries and free-surface related multiples

WANG Hai-jiao1,LIU Yu-min2,LIN Chun-hua3,LI Xing-yuan1,FAN Yuan-xun1,SHI Ying1   

  1. 1. College of Earth Science, Northeast Petroleum University, Heilongjiang Daqing 163318, China
    2. School of Electrical Engineering and Information, Northeast Petroleum University, Heilongjiang Daqing 163318, China
    3. Exploration and Development Research Institute of Daqing Oil Field Company Limited, Heilongjiang Daqing 163712, China
  • Received:2018-04-03 Revised:2018-10-12 Online:2018-12-20 Published:2019-03-03

摘要:

常规逆时偏移仅利用有效波进行成像,将表面多次波视为噪声压制掉.然而,表面多次波提供的额外地下反射信息能够用于偏移成像,提升成像范围.本文提出了一种表面多次波和一次反射波联合逆时偏移成像方法,它无需预测或分离表面多次反射波,能够对一次反射波和表面多次波直接成像.本文分别对水平层状模型和Sigsbee 2B模型进行了联合逆时偏移成像测试,结果表明,相对于常规有效波逆时偏移成像,所提出的联合逆时偏移方法能够提供额外的构造信息,基于一次波和表面多次波联合逆时偏移的成像方法能够对复杂地下构造准确成像.

关键词: 表面多次波, 逆时偏移, 联合成像, 多次波预测

Abstract:

Conventional RTM only uses primaries, however, free-surface related multiples can sometimes provide extra illumination of the sub-surface, and this information could be used in migration procedures. There are many migration methods using free-surface related multiples, but most approaches need to predict multiples. There is a new RTM approach that uses the primaries and the free-surface related multiples simultaneously. the proposed approach can provide comparable migration results and does not need multiple predictions. The source function was recorded field data including primaries and free-surface related multiples, together with a synthetic wavelet; the back-feild were field data with complete recorded. The imaging condition of the proposed approach was the same as the crosscorrelation imaging condition of conventional RTM. A layer velocity model with scatterers and the Sigsbee 2B synthetic data set were used for numerical experiments. The numerical results showed that the proposed approach can cover a wider range of the subsurface and provide better illumination compared with conventional RTM. The proposed approach was easy to implement and avoided tedious multiple prediction; it might be significant for general complex subsurface imaging.

Key words: free surface related multiples, reverse time migration, simultaneous migration, multiples prediction

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