Application of multiple stepwise regression method in the analysis of the relationship between porosity and tight sandstone: Case study of Chang 8 reservoir in Jiyuan area, Ordos Basin [多元逐步回归法在致密砂岩储层矿物与孔隙度关系分析中的应用--以鄂尔多斯盆地姬塬地区长8储层为例]

作者：Chen J.; Wang P.; Gao Y.; Li K.; Yang M.; Zhang J.; Li J.; Li S.^*

来源：天然气地球科学, 2021, 32(9): 1372-1383.

DOI：10.11764/j.issn.1672-1926.2021.02.009

• Chang 8 tight reservoir
• Jiyuan area
• Mineral type and content
• Multiple stepwise regression
• Ordos Basin
• Porosity model

The type and content of minerals are the key factors affecting the reservoir density. In order to quantitatively characterize the correlation between them and reservoir porosity, taking Chang 8 tight reservoir in Jiyuan area of Ordos Basin as an example, the multiple regression equation model between mineral content and porosity of Chang 8 reservoir was established by multiple stepwise regression analysis: y=18.500-0.126x3-1.017x4-0.577x7-0.674x8 (porosity=18.500-0.126×cuttings-1.017×chlorite-0.577×siliceous cement -0.674×ferrocalcite). The calculated porosity obtained by the multiple regression model is well fitted with the measured porosity, and the geological interpretation is reasonable and consistent with the reservoir characteristics. It is concluded that the multiple stepwise regression method based on the types and contents of various minerals in the reservoir can accurately predict the size of reservoir porosity, especially in the study of tight reservoir performance affected by multiple types of minerals.

• 单位
  中国科学院大学