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《Geophysical Prospecting for Petroleum》 2010-01
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Application of priori information constraint tomography static correction technique in the south of Western Qaidam basin

Wang Xiao Lu Juan,Feng Xinyuan,Li Fei,Chang Liang. State key Laboratory of Oil and Gas Reservoir Geology and Exploration,Chengdu University of Technology,Chengdu 610059,China  
In the south of western Chaidamu Basin,many blocks of 3-D seismic data with different geological targets have been acquired. The further exploration and production requires research on the overall geological features and sedimentary facies.Therefore,we carried out 3-D multi-surveys merged processing at the area.In this area, the near surface structure is complex,the lithology changes fast,the surface elevation difference reaches to 600m,the thickness of low-velocity zone is from 4 to 200 m,so the statics problem is serious in merged processing.After analyzing the adaptability of different statics methods,we proposed tomography statics constrained by priori information,and presented its basic theory and realization steps.In practical application of the method,correlation method is used to eliminate the first-arrival time difference between blocks, the initial velocity model is built with the shallow refraction and uphole data after phase-control processing,then first-arrival wave non-linear tomography inversion is carried out constrained by this initial model,finally,an accurate near-surface velocity model is built,and the static correction value can be calculated for the whole area.The application analysis indicates that tomography statics constrained by priori information can well solve the statics problem in 3-D multi-surveys merged processing in the area with complex near-surface conditions.
【Fund】: 中国石油重大科技专项(07-01Z-01-01)资助
【CateGory Index】: P631.4
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