Tomography static of refraction constrained with near surface model in Daqing Changyuan
Qi Chunyan1,2, Chen Zhide2, Liu Guoyou2, Chen Bin2
1. School of Geophysics and Geo-information Technology,China University of Geosciences(Beijing),Beijing,100083,China;
2. Exploration &Development Research Institute,Daqing Oilfield Company Ltd.,Daqing,Helongjiang 163712,China
Abstract：High quality seismic data is imperatively nee-ded for residual oil development in Daqing Chan-gyuan. The near surface changes rapidly in Chan-gyuan area，although its surface is flat.The exist-ing statics methods，such as micro-logging modelstatics，refraction statics，and the combination ofthese two，could not meet statics precision require-ment .Tomography static of refraction first breakconstrained with near surface model is proposed inthis paper. Based on micro-logging data interpreta-tion，a near surface model is built to calculate modelstatics, and to build an initial tomography velocitymodel. According to the characteristic of near surface,the wave trough time of refraction first break is pickedup to obtain the time delay of each seismic trace fortomography statics computation. For shot boundaryand irregular geometry areas, final statics will be de-termined according to the time difference trend be-tween model statics and refraction statics. The highresolution results of Lamadian 3D seismic survey haveproved the priority of this method.
