特低渗储集层砂岩孔隙结构的分形研究——以安塞油田Y区块和Z区块为例  

A Fractal Study on Pore Structure of Sandstone in Extra Low Permeability Reservoirs——An example of Y and Z blocks in Ansai oilfield

作　　者：马占旗[1] 任晓娟[1] 张宁生[1] 李转红[1] 

机构地区：[1]西安石油大学石油工程学院,西安710065

出　　处：《新疆石油地质》2007年第1期88-91,共4页Xinjiang Petroleum Geology

摘　　要：利用带有两参数分形几何公式对安塞油田Y、Z区块特低渗储集层岩心压汞资料数据进行了分析,结果表明,该区块储集层具有单一分形和多重分形特征。用由矩法计算所得孔隙结构特征参数均值、分选系数及变异系数与用整体线形回归所得分形维数的线性关系说明,用分形维数来定量描述储集层非均质性是可行的。此外,根据对不同分形特征孔隙结构微观分析,得出分形特征相似,其孔隙类型,沉积-成岩过程相似,当喉道半径变小(或孔隙总数减少),分形维数增加的结论。因此认为用分形特征来划分储集层的沉积-成岩相带或许是一种可行的方法。This study of mercury injection curves from cores of extra low permeability reservoirs in Y and Z blocks in Ansai oilfield shows that the reservoirs are of singular and multiple fractal natures using fractal geometric formula with two parameters. The linear relation assumes between the mean characteristic parameter, sorting coefficient, variation coefficient of pore structure by rectangular method and the fractal dimension by integrated linear regression, indicating that the fractal dimensions can be used to quantitatively describe the heterogeneity of reservoirs. Also, the microscopic analysis of pore structure with different fractal feature comes to the conclusion that the reservoir rocks with similar fractal nature have similar pore type, depositional environment and diagenetic process, and the fractal dimension will increase with pore throat radius （or total number of pore throats） decreasing. Therefore, it is proposed that application of fractal nature to classification of deposition-diagenesis facies is probably a feasible method.

关 键 词：分形维数 孔隙结构 低渗透储集层 成岩作用 沉积环境 

分 类 号：TE112.23[石油与天然气工程—油气勘探]