Q migration of low-SNR seismic data for viscoelastic media in Southern Junggar Basin
MA Junyan1, ZHANG Long1, LUO Zhaoyang2, WANG Xiaotao1, CHEN Long3
1. Geophysical Department, Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Urumqi, Xinjiang 830013, China; 2. School of Earth Science and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 3. BGP International, CNPC, Zhuozhou, Hebei 072750, China
Abstract：Surface and subsurface geological conditions in the southern margin of Junggar Basin are very complex,and seismic signal-to-noise ratio (SNR) is rather low.In this case,conventional prestack depth migration hardly makes imaging improvement.To overcome the problem,we propose a new strategy with processing tools provided by GeoEast System.First,an appropriate velocity model for the study area is established by means of velocity updating such as horizontal,vertical,and grid tomography,and TTI anisotropic velocity corrections provided by GeoEast-Diva.On GeoEast-Lightning,a tomographic inversion quality factor Q and viscous medium Q migration are use to achieve amplitude compensation,frequency recovery,and phase correction in order to improve the migration imaging resolution.The results show that Q migration for viscous media improves effectively the imaging quality of prestack depth migration,provides reli-able basic data for geological research,and strongly supports hydrocarbons exploration in the southern margin of Junggar Basin.
马俊彦, 张龙, 罗昭洋, 王晓涛, 陈龙. 黏滞介质Q偏移技术在准噶尔盆地南缘低信噪比地区的应用[J]. 石油地球物理勘探, 2018, 53(s1): 94-99.
MA Junyan, ZHANG Long, LUO Zhaoyang, WANG Xiaotao, CHEN Long. Q migration of low-SNR seismic data for viscoelastic media in Southern Junggar Basin. Oil Geophysical Prospecting, 2018, 53(s1): 94-99.
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