碎屑岩储层物性非均质性的层次结构

HETEROGENEITY OF POROSITY AND PERMEABILITY IN CLASTIC ROCK RESERVOIRS

储层物性非均质性与沉积体系内部的构成单位关系密切，可以分尺度进行研究：（１）在沉积体系级的大尺度范围内，不同的沉积体系具有不同的储集性能；在同一沉积体系中，不同的成因相孔渗值差别极大，主要取决于沉积作用过程中古水流能量和环境的变化。（２）在成因相级的中尺度范围内，各流体流动单元内部及不同的流体流动单元之间孔渗值存在明显的整体差别，这与构成流体流动单元的储层岩性相关系密切，如果叠加有不均匀的成岩作用的影响，那么流体流动单元的物性将会大大地降低。（３）在岩芯级的微尺度范围内，多孔介质具有各向异性特征。

AbstractThe heterogeneity of porosity and permeability of reservoirs are closely related to the architectures of depositional systems,and can be studied by scale.(1)On the scale of depositional system,different depositional systems are different in porosity and permeability.Porosity and permeability of different genetic facies in the same depositional system may have great differences.This depends mainly on the paleocurrent energy and environment in which the genetic facies were formed.(2)On the scale of genetic facies, porosity and permeability of the same fluidflow unit and between different fluidflow units are on the whole different.This is related to lithology of reservoirs constituting the fluidflow units.The superimposition of nonhomogenous diagenesis could decrease greatly the porosity and permeability of fluidflow units.(3)On the scale of core,porous media show anisotropic characteristics.