The application of Radon transform to suppress interbed multiples in Gaoshiti-Moxi region

doi:10.7623/syxb201809007

Acta Petrolei Sinica ›› 2018, Vol. 39 ›› Issue (9): 1028-1036.DOI: 10.7623/syxb201809007

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The application of Radon transform to suppress interbed multiples in Gaoshiti-Moxi region

Dai Xiaofeng, Liu Weidong, Gan Lideng, Xu Youping, Sun Xiping, Zhang Ming, Hu Ying

PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received:2018-04-08 Revised:2018-06-14 Online:2018-09-25 Published:2018-09-28

Radon变换压制层间多次波技术在高石梯-磨溪地区的应用

戴晓峰, 刘卫东, 甘利灯, 徐右平, 孙夕平, 张明, 胡英

中国石油勘探开发研究院北京 100083

通讯作者: 戴晓峰,男,1973年1月生,1994年获江汉石油学院勘察地球物理专业学士学位,2004年获中国石油勘探开发研究院硕士学位,现为中国石油勘探开发研究院油气地球物理研究所高级工程师,主要从事油藏地球物理和地震综合解释工作。Email:dai_xf@petrochina.com.cn
作者简介:戴晓峰,男,1973年1月生,1994年获江汉石油学院勘察地球物理专业学士学位,2004年获中国石油勘探开发研究院硕士学位,现为中国石油勘探开发研究院油气地球物理研究所高级工程师,主要从事油藏地球物理和地震综合解释工作。Email:dai_xf@petrochina.com.cn
基金资助:
国家科技重大专项（2016ZX05004-003）和中国石油天然气集团公司"物探重大技术现场试验与集成配套"课题项目（2017D-3503）。

Abstract

Abstract:

According to onshore seismic data, there is little difference between the interbed multiples and primary wave in velocity. It is difficult to pick up the primary velocity, and good application effect can hardly be obtained by Radon transform suppressing multiples. In the seismic data of Gaoshiti-Moxi region, Sichuan Basin, multiple noises exist in Sinian-Cambrian System, leading to the amplitude distortion of effective reflection. Then weak effective reflection is covered, resulting in the poor matching between logging synthetic seismogram and actual seismic data. In the study area, multiples are characterized by strong interference energy and a small difference in velocity with effective wave. Based on the research idea of processing and interpretation integration, primary wave velocity is picked up through the tectonic horizon constraint in time domain of velocity spectrum, so as to reduce the influences of multiples interference on velocity picking and improve the accuracy of planar and vertical velocity picking. Moreover, scanning and processing of the multiples suppression by Radon transform is performed using the stacking velocity with different weight coefficients, so as to determine the optimal matching weight factors and achieve multiples suppression with high accuracy. In Gaoshiti-Moxi region, multiples suppression is conducted on 3D seismic data, showing that the energy of multiples on the seismic profile is effectively attenuated with obvious wave group characteristics, and the correlation between logging synthetic seismogram and near-well seismic trace is greatly improved. The practical application effect indicates that this technology can effectively protect primary wave energy while suppressing multiples, able to reduce the uncertainty of suppressing multiples. The improvement in S/N ratio and imaging effect of seismic data is an effective technique to suppress onshore interbed multiples.

Key words: Radon transform, Sinian-Cambrian, Dengying Formation, multiples, velocity pickup

摘要：

陆上地震资料中，层间多次波与一次波的速度差异较小，一次波的速度拾取困难，利用Radon变换压制多次波往往难以取得好的应用效果。在四川盆地高石梯-磨溪地区的地震资料中，震旦系-寒武系存在多次波的干扰，致使有效反射的振幅畸变，弱的有效反射被掩盖，造成测井合成地震记录与实际地震资料匹配差。该多次波具有干扰能量强、与有效波速度差异小的特点。基于处理和解释一体化的研究思路，在速度谱上利用时间域的构造层位来约束一次波速度的拾取过程，以减小多次波干扰对速度拾取的影响，提高平面上和纵向上速度拾取的精度；利用不同权系数的叠加速度进行扫描处理和Radon变换压制多次波，确定最佳匹配权系数，实现更高精度的多次波压制。在高石梯-磨溪地区，三维地震资料经压制多次波处理后，地震剖面上多次波的能量得到有效衰减，波组特征更为清楚，测井合成地震记录和井旁地震道相关性大幅提高。应用效果表明，这一技术在压制多次波的同时，能够有效地保护一次波能量，减少压制多次波的不确定性，提高地震资料的信噪比和成像效果，是压制陆上层间多次波的有效技术。

关键词: Radon变换, 震旦系-寒武系, 灯影组, 多次波, 速度拾取

CLC Number:

P631.4

Dai Xiaofeng, Liu Weidong, Gan Lideng, Xu Youping, Sun Xiping, Zhang Ming, Hu Ying. The application of Radon transform to suppress interbed multiples in Gaoshiti-Moxi region[J]. Acta Petrolei Sinica, 2018, 39(9): 1028-1036.

戴晓峰, 刘卫东, 甘利灯, 徐右平, 孙夕平, 张明, 胡英. Radon变换压制层间多次波技术在高石梯-磨溪地区的应用[J]. 石油学报, 2018, 39(9): 1028-1036.

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The application of Radon transform to suppress interbed multiples in Gaoshiti-Moxi region

Radon变换压制层间多次波技术在高石梯-磨溪地区的应用

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