• 责任者：Tang Jun (Key Laboratory of Petroleum Resources Research ; Chinese Academy of Sciences ; Lanzhou 730000 ; China) ; Pang Guoyin
• 刊名：Journal of Earth Sciences and Environment
• 出版年：2013
• 卷期：35(1)
• 关键词：孔隙度 ; porosity ; 砂岩储集层 ; sandstone reservoirs ; 鄂尔多斯盆地 ; Ordos Basin
• 页码：p.56-65
• 图表：illus., 57 refs.
• 分类号：1003
• issnNo：ISSN1672-6561
• isbnNo：CN61-1423/P

Based on the analysis of characteristics and major controlling factors of Chang-8 section sandstone reservoir in Jiyuan area of Ordos Basin and the study on corresponding stratigraphic and diagenetic history, combined with petroleum geology theory and mathematical statistics method, porosity evolution was divided into two processes including the decrease and increase of the porosities under the condition of the restriction of present porosity, and a model for the porosity evolution of Chang-8 section sandstone reservoir in the research area was built. Porosity varied with the depth of burial and geological time from the initial burial to the present in the model. The results showed that the model with quantitative porosity evolution was a piecewise function with four sections. Mechanical compaction stage was a model with the decrease ofporosity, which was a continuous function with the independent variable of burial depth~ compaction and cementation stage was a model with the decrease of porosity, which was a continuous function with the variables of geological time and burial depth~ the secondary porosity increase was caused by the dissolution of acid fluid within a temperature range of 70 ~C-110 ~C, so that dissolution stage was a model with the increase of porosity, which was a composite function of depth and burial time; after the dissolution stage, formation porosity was in compaction and maintenance stage, which was a model with the decrease of porosity, and the model was a superimposed composite function of depth, burial time and the porosity increase amount. Finally, taking one well in the research area as an example, it was verified that the model with quantitative porosity evolution was consistent with actual geological condition, and could be applied to calculate the porosity of any strata.