Chaoyanggou Oilfield has low porosity, low perinea and serious heterogeneity, with natural and induced fractures.

朝阳沟油田储层低、低渗,非均质性严重,存天和人工。

Porosity can be caused by gases coming out of solution during cooling and becoming trapped between dentrite arms as tiny voids.

冷却过程中，溶液中的气体逸出造成多性，或被截留晶体枝杈之间形成微小气。

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.

井间交互检验证明,简单协克里格法预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.

最小试压差不是依赖于地层流体粘度和压缩性，而是为地层度、渗透率和射眼半径的函数。