表层季节性冻土对地震资料品质的影响

doi:10.13810/j.cnki.issn.1000-7210.2023.06.006

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Abstract Due to the protection of surface vegetation in most farmland and grassland areas， seismic exploration can only be carried out in winter after the harvest of crops. People in northern China typically irrigate their farmland around mid-October each year， resulting in high water content in the soil and low winter temperatures. As the soil freezes on the surface， a set of high-speed permafrost layers form， adding complexity to near-surface structures. Vibroseis excite signals at the surface， and seismic wave propagation in frozen soil will be affected by the resonance frequency of frozen soil medium， weakening the energy of low-frequency seismic wave signals.The Results indicate that after the permafrost layer is covered， the received low-frequency information weakers and the overall spectrum shifts towards high-frequency section. In view of the complex near-surface structure caused by seasonal frozen soil， the seismic wave propagation mechanism of frozen soil layer and the actual data analysis are carried out in this paper， which can provide a solution for improving the quality of vibroseis acquisition data in seasonal frozen soil area.

Key words： permafrost near-surface modeling data quality damping force absorption attenuation resonance frequency

Received: 23 March 2023

PACS:

P631

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	CHEN Jingguo
	YUAN Shenghui
	TANG Chuanzhang
	CUI Hongliang
	LI Jingye
	DENG Zhiwen

Cite this article:

CHEN Jingguo,YUAN Shenghui,TANG Chuanzhang等. The influence of seismic data quality by seasonal permafrost[J]. OGP, 2023, 58(6): 1343-1348.

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http://www.ogp-cn.com/EN/10.13810/j.cnki.issn.1000-7210.2023.06.006 OR http://www.ogp-cn.com/EN/Y2023/V58/I6/1343

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