Large-array 3D-VSP technique applied to Daqing Oil Field
LI Yan-peng1,2, CHEN Yuan-zhong2, XU Gang2, HAO Jian-bo3, XU Zheng-shun4
1 School of Ocean and Earth Sciences,Tongji University,Shanghai,200092,China;
2 New-tech Development Division,BGP Inc.,Zhuozhou,Hebei,072751,China;
3 BGP International,BGP Inc.,Zhuozhou,Hebei,072751,China;
4 Daqing Oilfield,PetroChina,Daqing,Heilongjiang,163000,China
Abstract：Deep seismic events are hard to be tracked and the inner structures of reservoir are hard to be identified in XJWZ of Daqing Oil Field because the formation of volcanic gas reservoir and its spatial distribution are very complicated.With large-array 3D-VSP seismic,high precision images and some direct reservoir parameters can be acquired around the observation well.This paper shows a case study of 160-level 3D-VSP survey in Well XS21-1 of Daqing Oil Field.An objective oriented geometry and survey parameter optimization were introduced in data acquisition aspect.For data processing,we adopted a series of distinctive techniques including high precision auto-picking of 3D-VSP first breaks,vector wavefield separation,anisotropy parameter inversion,ray tracing-based VSPCDP mapping and migration.Finally,processing results were analyzed and interpreted.Results indicate that large-array 3D-VSP can be used for reservoir subtle interpretation effectively.
