Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (4): 106-110.doi: 10.3969/j.issn.1673-8926.2013.04.020

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Application of box-wave technology to investigation of interference wave in Qiangtang Basin

LEI Yang，WU Wenjing，LIANG Zhenghong，CHEN Bing，LIU Yuanzh   

  1. Southwest Company，Sinopec Geophysical Corporation，Deyang 618000，China
  • Online:2013-10-08 Published:2013-10-08

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Abstract:

Multiple plateau uplift movement leads to fast lateral lithology variation, strong heterogeneity and development of underground fracture in Qiangtang Basin. The signal-to-noise ratio of seismic data acquired in earlier days is low, and the type of interference wave that often cover the effective wave is various in the single shot record. In order to suppress the interference wave in the process of seismic prospecting by seismic combination method, it is necessary to understand the propagation and attribute character of interference wave completely. Firstly, used the single shot record and radar chart technology to analyze the style, direction of propagation, velocity, frequency and wavelength characteristics of major interference wave in the prospect area, and then analyzed the effect of suppressing interference wave by sorting common-receiver-point gathers with different pattern length. The result shows that: when the detector array is just a single point, it is invalid to suppress the interference wave in the prospect area; as the pattern length increase, the effect of suppressing interference wave with high frequency, low velocity and short wavelength is better; when the pattern length reaches 160 meters （maximum pattern length）, it has a good effect to suppress the interference wave with high frequency, low velocity and short wavelength and improve the quality of original data, but the maximum pattern length has a poor effect to suppress the interference wave with high velocity and long wavelength. In order to suppress the interference wave with high velocity and long wavelength well, larger pattern length or multi-channel mixing process is necessary. The box-wave technology is suitable for investigating the interference wave in low signal-to-noise ratio prospect area, and it is beneficial to suppress the interference wave in the process of seismic prospecting and multichannel mixing process, and then improve the signal-to-noise ratio of original data.

Key words: reservoir formation, controlling factor, enrichment law, Jurassic reservoir, Pengyang Oilfield

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