Separation of seismic diffraction wave and its influencing factors in complex fault blocks

MING Jun; WANG Jianli; LIU Jianhui; WANG Zhiyong; LI Jieli; LIU Guochang

doi:10.16562/j.cnki.0256-1492.2020070201

2021 Vol. 41, No. 3

Article Contents

Article navigation > Marine Geology & Quaternary Geology > 2021 > 41(3): 212-219

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MING Jun, WANG Jianli, LIU Jianhui, WANG Zhiyong, LI Jieli, LIU Guochang. Separation of seismic diffraction wave and its influencing factors in complex fault blocks[J]. Marine Geology & Quaternary Geology, 2021, 41(3): 212-219. doi: 10.16562/j.cnki.0256-1492.2020070201

Citation:

MING Jun, WANG Jianli, LIU Jianhui, WANG Zhiyong, LI Jieli, LIU Guochang. Separation of seismic diffraction wave and its influencing factors in complex fault blocks[J]. Marine Geology & Quaternary Geology, 2021, 41(3): 212-219. doi: 10.16562/j.cnki.0256-1492.2020070201

Separation of seismic diffraction wave and its influencing factors in complex fault blocks

1.
CNOOC China Limited, Tianjin Branch, Tianjin 300459, China
2.
School of geophysics, China university of petroleum, Beijing 102249, China

Received Date: 02 July 2020

Revised Date: 16 July 2020

Publish Date: 28 June 2021

Abstract

Abstract

The seismic diffraction wave is the seismic responses of subsurface small-scale discontinuous structures, such as fractures, faults, karst caves and pinching-out strata. Correct recognition of diffraction wave is of great significance for exploration of complex fault block oil and gas fields. Based on the characteristics of diffracted and reflected wave signals, a method for separation of diffracted wave is developed in this paper on the basis of plane wave prediction and the analysis of the influences of noise and plane wave prediction filter parameters. The plane wave prediction method can separate seismic reflections and diffraction waves by predicting the event of reflection wave with better continuity and retain the event of discontinuous diffraction wave with greater bending degree through dip estimation. The comparison of simulation data and actual data shows that noise seriously affects the separation of diffracted wave, and the separation result will be inaccurate if the noise is too large; the noise and false image will be introduced if the smooth radius of plane wave prediction filter is too small, and the separation of diffracted wave will not be complete if the smooth radius is too large, and the diffracted wave response of small fault block is difficult to be separated.
- complex fault block /
- seismic diffraction wave /
- plane wave prediction /
- local dip /
- diffraction wave separation

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References

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