1. GRI,Exploration and Production Research Academe,Xinjiang Oilfield Company,Urumqi 830013,China 2. Seismic Exploration Research Center,East Geophysics Company(Xinan),Chendu 610213,China
In Junggar basin,near surface structure is an obvious factor influencing seismic data.2D 3C seismic line data were collected recently at Gaoquan anticline of the mountain front area.Nevertheless,S/N of PS-wave section was obviously lower than P-wave section at the east end of 2D line.To verify and analyze near surface structure's influence on multi-wave 3C seismic data,the authors built forward model by using its near surface structure and well-logging data so as to get modeling shots with real acquisition geometry.By analysis of modeling results and near surface structure investigation,it is found that the thickness of low velocity layer increases and Xiyu conglomerates are developed at the east end of 2D line because of Kuitun River's sedimentation,which is the main reason of energy and S/N reduction of multi-wave seismic data.It is also proved that PS wave is more easily influenced by near surface structure's attenuation than P wave.
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Zhi-Guo CHENG, Ting-Ting HU, Ling-Yun WEI, Hai-Yang GUO. Influence of near surface structure on multi-wave exploration at the mountain front of South Junggar Basin. Geophysical and Geochemical Exploration, 2019, 43(4): 866-871.
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