Anisotropy analysis and parameters extraction on 3D VSP common receiver gathers
Cnooc Shenzhen, Bgp In · Shiyou diqiu wuli kantan · 2011
Anisotropy analysis and parameters extraction based on the nonhyperbolic moveout is discussed in this paper.The nonhyperbolic moveout,which is more accurate on long-spread,is derived under VTI hypothesis.The main idea is as follows: Firstly the feasibility of this method is demonstrated by synthetic data.Then,it is applied to a filed VSP data,where the anisotropy analysis including VTI and azimuth anisotropy is performed on 3D VSP common receiver gathers.Finally,extraction of interval anisotropy parameters from the effective parameters is discussed and tested on both model and field VSP data.As a result,the data in this area shows strong VTI and some azimuthal anisotropy.