储层速度建模分析及域转换

Analysis of reservoir velocity modeling and domain conversion

通过建模的方法建立全三维空变网格速度体进行时深转换。首先对井筒、地震速度谱数据进行严格质控;然后优选体趋势约束方法将单井速度内插外推。结果表明该方法可以将井筒速度和地震速度谱高效地融合为一体,包含了丰富的横向和纵向速度的变化信息,从而实现速度体与构造形态、井筒以及井间速度变化趋势更加合理;最终使深度域构造模型更加真实地反映地下构造的变化趋势,提高域转换后数据的相关性。

Full 3D space-variant grid velocity body is established by modeling method for time to depth conversion.Firstly,the quality of the wellbore and the seismic velocity spectrum data is strictly controlled. Then optimum volume trend constraint method is applied to wellbore velocity interpolation and extrapolation. It shows that the method can integrate wellbore velocity and seismic velocity efficiently,which contains abundant horizontal and vertical velocity information. It makes the change trend of velocity body,structural shape,wellbore and internal well velocity more reasonable. Finally,the structural model in depth domain can more precisely reflect the change trend of underground structure,and improve the correlation of data after domain conversion.