济阳地区石炭-二叠系含煤地层砂岩粒度分布的分形特征研究

Study on the Fractal Feature of Grain Distribution of Sandstone inCoal-bearing Strata in Permo-Carboniferous System in Jiyang Area

对砂岩进行粒度分布研究不仅有助于成因分析和环境解释,而且是评价砂岩储集性能和砂岩微观非均质性的重要指标。应用分形的思路和方法研究了石炭-二叠系含煤地层砂岩粒度分布的分形特征。研究表明,分维数大小能够反映砂岩形成背景的复杂性和环境,且分维越大,背景复杂性越高,自组织程度越低。因此,研究砂岩粒度分形特征,对分析沉积环境和沉积背景的复杂性具有指导意义。

Study on grain distribution of the sandstone is advantageous for genetic analysis and environmental interpretation, and it is also an important index in evaluating reservoir characteristics together with its microcosmic heterogeneity. Fractal theory was used in this paper, and fractal feature of grain distribution of sandstone in coal-bearing strata in Permo Carboniferous System was studied. The result showed that, dimension of fractal can represent the complexity of genetic environment, and the larger the dimension of fractal, the more complicated the genetic background, and the less the self-organization degree. In a word, to study the fractal feature of sandstone grain distribution is directive for analysis in the complexity of sedimentary environment and sedimentary background.