基于孔隙分形特征的神木气田山西组成岩相定量分类

Quantitative fractal dimension classification of diagenetic facies of Shanxi Group in Shenmu gas field

滕藤 金江宁 屈元基 李二洋 栗涵洁

中国石油塔里木油田分公司勘探开发研究院，新疆 库尔勒 841000 中国石油长庆油田分公司第一采气厂，陕西 延安 717500 中国地质大学（北京）能源学院，北京 100083

低孔低渗储层孔隙结构复杂，成岩作用是其主控因素。文中引入分形理论，结合压汞、物性资料，对储层孔隙结构进行定量评价，采用水银饱和度法计算孔隙结构的分形维数，并根据分形维数与储层物性的关系对孔隙结构进行研究；明确了储层孔隙结构在一定孔径范围内具有分形特征，且分形维数越小，物性越好。在此基础上，将研究区划分为5种成岩相类型，并建立孔隙结构分形特征与成岩相类型的对应关系，为寻找有利储层提供依据。

The pore structure of low porosity and permeability reservoir is complex, and the main controlling factor of which is diagenesis. Based on the fractal theory, the paper tries to quantitatively evaluate the pore structure of reservoir from the data of mercury intrusion and physical property. Fractal dimension is obtained by mercury saturation, and the correlation between pore fractal characteristics and reservoir parameters is studied. The pore structure of reservoir has fractal features within a certain range of pore sizes, and the smaller the fractal dimension is, the better the property is. The study area is divided into 5 types of diagnetic facies, and the corresponding relationship between fractal characteristics of pore structure and diagenetic faces is established, which provides a basis for finding favorable reservoir.

10.6056/dkyqt201804005