• 责任者：Liu Zhanguo (Hangzhou Research Institute of Geology ; PetroChina ; Hangzhou 310023 ; China) ; Si Chunsong
• 刊名：Acta Sedimentologica Sinica
• 出版年：2011
• 卷期：29(4)
• 关键词：砂岩储集层 ; sandstone reservoirs ; 四川盆地 ; Sichuan Basin
• 页码：p.744-751
• 图表：8 illus., 34 refs.
• 分类号：1003
• issnNo：ISSN1000-0550
• isbnNo：CN62-1038/P

As unique tight reservoirs in China, the Middle-Upper Jurassic sandstones in central Sichuan Basin occur at present-day burial depth of 1 500si-font-family: ’Times New Roman’">～3 000 m and they are characterized by ultra-low porosity and ultra-low permeability that fail to match their burial depth. Microscopic observation and statistics of relative contribution of compaction and cementation to porosity loss indicate that intensive compaction is responsible for the anomalous tightness of these sandstones. Furthermore, utilizing the research method of sandstone dynamical diagenesis theory, based on the analysis of original sandstone components and basin diagenetic dynamic factors, the mechanism of intensive compaction of Middle and Lower Jurassic sandstones in the study area has been discussed. It is suggested that fine grain size and high ductile fragments content are the internal cause, while the basin diagenetic dynamics characteristics of deep paleo-burial, high paleo-geothermal field and late oil emplacement are considered as the external cause.