焦灰岩储层水平井m、n值确定方法

Calculation Method for m and n of Horizontal Well in Biolithite Reservoir.

通过对焦灰岩储层岩石结构、孔隙结构及储集空间与垂直和水平方向m、n值实验数据关系研究 ,指出流花 11 1油藏焦灰岩低孔隙度储层中微裂缝基本被充填 ,且以孔隙型为主 ;高孔隙度储层中微裂缝基本未被充填 ,且以孔隙 裂缝型为主 ;造成标准孔隙度与渗透率具有明显分界性 ,导致n值和标准孔隙度具有分段相关性。储层在水平和垂直方向上的差异造成其m、n值的不同 ,但二者的m、n值与两个方向上的渗透率比值存在较好的指数关系。通过此关系 ,可以利用水平方向的m、n值确定水平井垂直方向的m、n值 。

In Luhua 111 biolithite reservoir, micro-fractures are mostly filled and main reservoir spaces are pore system in low-mid-porosity reservoir; but micro-fractures are not completely filled and main reservoir spaces are pore-fracture system in high-porosity reservoir. It is found there is a visible limit on cross-plot of national porosity versus permeability and different relationship in different value n and national porosity through researching relationship of value m and n between horizontal and vertical direction. Heterogeneity results in different value of m and n ; it has good index relationship between the ratio of permeability to value of m and n. In horizontal well logging data interpretation, good results of saturation can be got through getting value m and n of vertical direction.