砂岩储层的粒度分形特征及在WZ油田的应用

Grain size fractal characteristics of sandstone reservoir and its application in WZ Oilfield

应用分形理论证实了三角洲前缘、河床亚相砂岩的粒度具有自相似的分形结构。计算表明,不同成因砂岩的粒度分维数不一样。通过讨论粒度组成分维数在岩石的形成环境解释和储集物性评价中的应用,以及对WZ油田砂岩储层的研究证明,砂岩的粒度分维数可以用来研究沉积环境的演化及岩石的分选系数、渗透率等。

By applying fraetal theory, the grain size composition of delta - front facies and reverbed runway was proved to have selfsimilar fractal structure. The calculations showed that sandstones with different origins have different fractal di- mension numbers. Based on the application of fractal dimension number of grain size composition in sedimentary environment interpretation and reservoir evaluation and the case study of the sandstone reservoir of WZ Oilfileld, it is indicated that the fractal dimension number of grain size composition can be used to study the evolution of sedimentary environment, and the sorting coefficient, permeability, etc. of rock.