地球物理学进展 ›› 2019, Vol. 34 ›› Issue (1): 395-400.doi: 10.6038/pg2019BB0592

• 应用地球物理学Ⅱ(海洋、工程、环境、仪器等) • 上一篇    下一篇

Q偏移技术在深海地震资料处理中的应用研究

王兆旗1,杨存1,王童奎2,3,李立胜1,范国章1,王宗仁1   

  1. 1. 中国石油杭州地质研究院,杭州 310023
    2. 中国科学院地质与地球物理研究所,北京 100029
    3. 中国石油拉美(巴西)公司,里约热内卢 22041001,巴西
  • 收稿日期:2018-02-07 修回日期:2018-11-08 出版日期:2019-02-20 发布日期:2019-04-15
  • 作者简介:王兆旗,男,1981年出生,工学硕士,高级工程师,主要从事地震资料处理及方法研究工作.(E-mail: wangzq_hz@petrochina.com.cn)
  • 基金资助:
    国家自然科学基金项目资助.(41504105)

Research of Q migration technology in deep marine seismic data processing

WANG Zhao-qi1,YANG Cun1,WANG Tong-kui2,3,LI Li-sheng1,FAN Guo-zhang1,WANG Zong-ren1   

  1. 1. Petrochina Hangzhou Research Institute of Geology, Hangzhou 310023, China
    2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beiijing 100029, China
    3. China’s Oil and Gas Exploration and Development Company, Rio De Janeiro 22041001, Brazil;
  • Received:2018-02-07 Revised:2018-11-08 Online:2019-02-20 Published:2019-04-15

摘要:

深海探区蕴含着大量的油气资源,高质量的地震资料是识别有利储层的关键,然而,一些探区由于浅层气云、气烟囱、泥浆带、低速异常体等高吸收异常带的存在,造成深层地震波振幅变弱,频率降低,严重影响构造成像精度.Q偏移技术来补偿深海地震资料的吸收衰减,首先采用谱比法建立时间域的等效Q场;其次,基于等效Q场进行深度域Q层析反演建立准确的Q场模型;最后基于高精度Q场进行克希霍夫Q叠前深度偏移.将该技术在某海外深海探区实际资料处理中应用,浅层低速异常造成的能量吸收现象得到了解决,弱能量区的成像质量得到了明显改善.

关键词: Q偏移, 地层吸收衰减, 谱比法, Q层析反演, 低速异常

Abstract:

Deep-marine exploration area contains a large amount of oil and gas resources, the seismic data of high quality is the key to the identification of favorable reservoirs. However, some area because of the existence of high absorption anomaly zones such as shallow gas clouds, gas chimney,mud band or low-velocity anomaly, leads to weakening of seismic wave amplitude, as well as decrease of frequency,and will seriously affect the imaging accuracy of deep formation. Q migration technique is used to compensate for absorption attenuation in seismic propagation. The equivalent Q field firstly established in time domain based Log Spectral Ratio(LSR); secondly, based on the equivalent Q field,carry on depth domain Q tomographic inversion to establish Q field model accurately; finally, carry out kirchhoff Q prestack depth migration based on high precision Q field. The technology is applied to the real seismic data processing in a deep-sea exploration area. The weak energy phenomenon caused by shallow low-velocity anomaly absorption is solved, and the imaging quality of the weak energy area has been improved significantly.

Key words: Q migration, Absorption attenuation, Log Spectral Ratio(LSR), Q tomography, Low-velocity anomaly

中图分类号: