基于偏最小二乘法评价低渗透砂岩储层质量

Evaluation of pore structure impact on low permeability sandstone reservoir quality based on partial least square method

微观孔隙结构是影响低渗透砂岩储层质量的重要因素。应用偏最小二乘法建立了孔隙结构对低渗透砂岩储层孔隙度、渗透率影响的回归模型。结果表明:排驱压力、孔喉均值、变异系数是影响低渗透砂岩储层孔隙度的主要负面因素,而中值压力是主要正面因素;结构系数、孔喉均值、分选系数是影响低渗透砂岩储层渗透率的主要负面因素,而变异系数是主要正面因素。上述结论对于进一步拓展低渗透砂岩储层综合评价研究有着重要的意义。

Pore structure has an important impact on the quality of low permeability sandstone reservoirs. Partial least square method is used to set up a regression model to evaluate the impact of pore structure on porosity and permeability in low permeability sandstone reservoirs. The results indicated that: entry pressure,mean pore-throat size and coefficient of variation are major negative factors on the porosity of low permeability sandstone reservoirs,while median pressure is a major positive factor; texture coefficient, mean pore-throat size and sorting coefficient are major negative factors on the permeability of low permeability sandstone reservoirs, while coefficient of variation is a major positive factor. The conclusions have great significance to more integrated evaluation research on low permeability sandstone reservoirs.