Cross check in cross-borehole shows that root-mean-square error of predicted porosity of simple cokriging is less than 10% compared with that of linear re-gression method.

井间交检,简单协克里格法预测孔隙度的均方根误差比线性回归法小10％以上。

The minimum underbalance is independent of viscosity and compressibility and of reservoir fluids.It is a function of the formation porosity, permeability and radius of perforation channels.

最小测试压差不是依赖于地层体粘度和压缩性，而是为地层孔隙度、渗透率和射孔孔眼半径的函数。