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Getting the Reflection Longitudinal Wave Average Velocity in Crust with Common Extended Spread Method in Sanzhao Depression of Songliao Basin

LI Qin xue 1 YANG Bao jun 2 YU Ping 2 WANG Jian min 1 LI Zhan lin 1 WANG Hong zhi 1 WANG Shi yu 2 (1.Daqing Petroleum Administration Bureau, Daqing 163357, China; 2.Department of Geophysics,Jinlin University, Changchun 130026, China)  
Common extended spread method is used in getting the reflection longitudinal wave average velocity in crust,then compute the average wave velocity of the basement in order to discuss the geometry feature of Moho.Through synthetical error analysis,we can get the average longitudinal wave velocity in the crust of the basin approximate 6.197km/s(corresponding t0 is 10.676s),and the basement's approximate 6.75km/s.It is thought that there is an upwelling process of the upper mantle under the basin through comparing with the crust's average wave velocity of globe platform , continent continent collision belt and rift basin belt.One part of the upwelling matter get into middle and lower part of the crust to cause the basement average wave velocity's increasing.Discussing the condition of getting the crust's average wave velocity with extended spread method, including the conditions of Moho seismic phase,surface and receive the length of spread and so on.
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