三维速度场的建立及其在层位标定中的应用

3-D Velocity Field and Its Application in Horizon Calibration

三维速度场建立的基础是速度资料,综合使用VSP资料、速度谱资料和声波测井资料可以建立高精度的三维速度场。在建立三维速度场的过程中,比较烦琐的是平面平滑处理,而通常按网格化方法后进行平面平滑处理的三维速度场占用较大存储空间,文中提出的分块多项式曲面拟合的方法有效地弥补了这一不足。将应用分块多项式曲面拟合的方法所获得的三维速度场应用于地震资料解释的层位标定中,可以为无VSP或地震测井的井位提供较为准确的时深关系,从而避免了解释人员进行层位标定时的盲目性。并将该方法应用于实际油田开发,取得了较好的实际应用效果。

Velocity data is the basis of 3-D velocity field.Making comprehensive use of VSP data,velocity spectrum data and acoustic logging data can help establish a high-precision 3-D velocity field.In the process of 3-D velocity field,surface smooth processing is comparatively troublesome,and the 3-D velocity field after the gridding surface smooth processing usually holds larger storage space.The proposed block polynomial surface fitting method can effectively make up for the deficiency.The 3-D velocity field obtained from this method used in seismic data interpretation horizon calibration could provide more accurate T-D conversion relationship for the well without VSP or seismic log.On horizon calibration work,seismic data interpretation workers can also avoid blindness.This method has been applied in actual oil development and achieved good results.