The Origin of Authigenic Illite in Tight Sandstones and Its Effect on the Formation of Relatively High-Quality Reservoirs: A Case Study on Sandstones in the 4th Member of Xujiahe Formation, Western Sichuan Basin
详细信息
- 责任者：Meng Wanbin (State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Lü Zhengxiang
- 刊名：Acta Petrolei Sinica
- 出版年：2011
- 卷期：32(5)
- 关键词：致密砂层 ; tight sands ; 伊利石 ; illite ; 四川盆地 ; Sichuan Basin
- 页码：p.783-790
- 图表：4 illus., 3 tables, 28 refs.
- 分类号：1003
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
摘要
The 4th Member of Xujiahe Formation in the western Sichuan Basin is composed of typical tight sandstones that contain abundant debris but very scarce feldspar in skeleton grains. Authigenic clay minerals are dominated by illite and kaolinite, wherein authigenic illite can be divided into three principal types. Therefore, the formation of authigenic illite generally plays a positive role in the primary porosity preservation and the development of secondary pores of sandstones, and consequently favors the formation of relatively high-quality reservoirs.