【摘要】 作者提出了一套构建高精度巨型速度场的方法,在塔里木盆地里建立的一个巨型速度场,面积达10.2×104km2,深度达8km.针对巨型速度场的特有问题,采用野值自动剔除、交点速度闭合、水平切片速度标定、用线性介质模型下延VSP(垂直地震剖面)数据、利用校正后声波测井资料补充VSP井密度不足等方法,综合使用速度谱、VSP和声波资料以及数据库技术建立了高精度速度场。用速度场建好后完成的两口VSP井实测速度数据检验表明,速度场预测速度最大绝对误差是54m/s,平均为37m/s;最大相对误差是1.87%,平均为1.26%.根据本速度场提供的速度数据绘制的深度构造图上,使原来因速度横向变化在等t0图上消失的含油气构造正确地显现出来。更多还原

【Abstract】 In this paper,we provide a whole set of method to develop a high precise gigantic velocity field.And we build a giant velocity field in Tarim basin.This velocity field is about 10.2×10 4 km 2 ,which equals to the total areas of Jiangsu province,and8km deep.In accordance with the special problems of giant velocity field,we use automatic dis-carding abnormal values,ridding intersection velocity closing error,and horizontal slice velocity calibration,extend VSP well.By comprehensively using velocity spectrum,VSP,sonic log data,and database technique,we establish a high pre-cision velocity field.With this velocity field,we test two VSP wells which were completed using velocity field data.The pre dicted max absolute error is54m/s,the average is37m/s;the max relative error is1.87%,the average is1.26%.Ac -cording to the data given by this velocity field,we can plot a depth structural map,which correctly disclose a petrolif er-ous structure that we can not show it on the T0contour map.更多还原