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The method for shallow seismic exploration in Qiangtang basin |
LIU Jian-Xun, ZHANG Bao-Wei, WANG Xiao-Jiang, XU Ming-Cai |
Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China |
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Abstract Due to complex seismic-geological conditions,it is very difficult to acquire high quality results of shallow seismic exploration in Qiangtang basin of Tibet. In this paper,through the experiment of shallow seismic exploration technology in this area,the authors discussed the interference of the permafrost layer to the seismic data.In seismic data acquisition,a smaller channel spacing should be adopted,with a number of long arrangements of multi-channel receiving mode.In addition,the number of CDP stacking is increased,and a large tonnage high frequency vibrator is utilized for high-frequency excitation.In this way,a higher quality of raw seismic data can be obtained.In seismic data processing stage,we can use the corresponding de-noising technology before CDP stacking,which can effectively suppress various interference waves,such as random noise and coherent noise.The acquisition method and processing technology of 2-D shallow seismic survey is tentatively summarized,and the experimental study has achieved good results.The results achieved by the authors have certain reference value for application and study of shallow seismic exploration technology in plateau permafrost area in the future.
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Received: 30 June 2014
Published: 10 August 2015
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