砾岩的粒度分形特征及在克拉玛依油田的应用

GRAIN SIZE FRACTAL CHARACTERISTICS OF CONGLOMERATE AND ITS APPLICATION IN KARAMAY OILFIELD

应用分形理论证实了洪积扇砾岩的粒度组成具有自相似的分形结构。计算表明，砾岩的分维数大于砂岩的分维数，而且不同成因砾岩的粒度分维数也不一样。并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，以及对克拉玛依油田砾岩储集层的研究证明，砾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。

This paper proved that grain size composition of pluvial fan conglomerate has self similar fractal structure by applying fractal theory. The calculations showed that fractal dimention number of conglomerate is bigger than that of sandstone, and conglomerates with different origins have different fractal dimension numbers. Based on the application of fractal dimension number of grain size composition in sedimentary environment interpretation and reservoir evaluation and case study of conglomerate reservoir in Karamay oilfileld, it is indicated that the fractal dimension number of grain size composition can reflect the evolution of sedimentary environment, and also establishes linear relationship with sorting coefficient and permeability of rock.