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Method for conducting earthquake signal high frequency compensation utilizing earthquake micro metering

A technology of seismic signal and compensation method, applied in seismic signal processing, seismology for logging records, etc., can solve problems such as influence, effect measurement accuracy limitation, etc.

Inactive Publication Date: 2005-09-28
ZHEJIANG UNIV
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Problems solved by technology

[0003] In the past, the absorption attenuation compensation near the surface was often performed by Q inverse filtering, but its effect was affected by the limitation of the measurement accuracy of the Q parameter.

Method used

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  • Method for conducting earthquake signal high frequency compensation utilizing earthquake micro metering
  • Method for conducting earthquake signal high frequency compensation utilizing earthquake micro metering
  • Method for conducting earthquake signal high frequency compensation utilizing earthquake micro metering

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Embodiment Construction

[0014] In the present invention, the seismic micro-logging records obtained by seismic sources (usually detonators) at different depths are edited to retain the first arrival wave, and the amplitude spectrum and phase spectrum are analyzed to obtain the first arrival of the depth relative to the minimum depth. The filter response of the wave system. Taking the system filter response of the first arrival at the minimum depth as the expected output, for the filter responses of the first arrival at different depths, the inverse filter for formation attenuation and absorption can be obtained according to the principle of least square inverse filtering. After the post-stack seismic data are processed, high-frequency compensation of seismic signals can be realized.

[0015] The field seismic micro-logging observation technology of the present invention is provided by the following diagrams. figure 1 (a) is single well observation mode, figure 1 (b) is the dual-well observation mod...

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Abstract

The present invention discloses HF compensating method for seismic signal with seismic microlog. The seismic waveform information is utilized in analyzing spectral characteristic of primary waveform in direct wave and finding out the attenuation features of seismic signal in different depths. Meanwhile, system input and output are used in analyzing absorbing attenuation response of near surface system and performing HF compensation of seismic data. The present invention applies seismic microlog technology in the research of attenuation law of near surface medium, and the waveform characteristic of serial seismic primary waves is used in searching the waveform spectrum variation in different depths, so that one reverse filter factor is found out for the HF compensation of superposed seismic data with artificial seism reflecting signal. The present invention has raised seismic signal distinguishing capacity.

Description

technical field [0001] The invention relates to a method for high-frequency compensation of seismic signals by using seismic micro-logging, in particular to an effective method for improving the resolution of seismic signals by utilizing the attenuation law of micro-logging observation signals for high-frequency compensation. Background technique [0002] Seismic micro-logging technology was mainly used to investigate the near-surface geological structure in the past. It mainly uses a series of seismic sources with different depths to ground geophones with different first-arrival times of seismic waves to understand the thickness of the underground low-velocity zone and the depth of the water table. Depth, which is concerned with the arrival time of the first earthquake wave. [0003] In the past, the absorption attenuation compensation near the surface was usually performed by Q inverse filtering, but its effect was affected by the limitation of the measurement accuracy of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/40
Inventor 田钢王者江石战结董世学许升晖何海元苏茂鑫
Owner ZHEJIANG UNIV
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