泛克里金法在大庆油田徐家围子西北地区密度建模上的应用

Application of universal Kriging to the density modeling in north western Xujiaweizi area of Daqing oil field

通过大庆油田徐家围子西北地区汪家屯、升平以及宋芳屯等 3个构造实测部分的钻井岩心密度及测井密度资料 ,对不同深度平面分布不均匀且较稀疏的密度数据 ,利用泛克里金方法计算加密数据 ,得出地下 2 30 0～ 2 90 0m深度之间的密度分布特征。建立了这一深度空间内的密度模型 ,为利用重力场建模提供了初始模型和密度空间约束。

This paper presents a density modeling approach with Universal Kriging algorithm. The data are obtained from either measurement of borehole core specimen in 3 structures such as Wangjiatun,Shengping and Songfangtun or density logging curves. Density distributions on each layer of non even and few data are modeled using Universal Kriging. The spatial distribution of density within the depth range from 2300m to 2900m in the study area is thus obtained. The density model in this depth is very much useful in the establishment of initial model and density space constraint for gravity modeling.