The influence of seismic data quality by seasonal permafrost
CHEN Jingguo1,2, YUAN Shenghui2, TANG Chuanzhang3, CUI Hongliang2, LI Jingye1, DENG Zhiwen2
1. College of Geophysics, China University of Petroleum (Beijing), Beijing 102249, China; 2. BGP Inc., CNPC, Zhuozhou, Hebei 072751, China; 3. Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062550, China
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.
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