Diagenesis and Pore Evolution of the Liushagang Formation in Wushi Sag
详细信息
- 责任者：Liu Chong (Zhanjiang Central Laboratory ; Research Institute of Energy Technology and Oilfield Engineering ; CNOOC ; Zhanjiang 524057 ; China) ; Zhu Dingjun
- 刊名：Geology and Resources
- 出版年：2013
- 卷期：22(5)
- 关键词：砂岩储集层 ; sandstone reservoirs ; 北部湾 ; Beibu Gulf
- 页码：p.426-430
- 图表：3 illus., 2 tables, 10 refs.
- 分类号：1003
- issnNo：ISSN1671-1947
- isbnNo：CN21-1458/P
摘要
A detailed study is carried out on the diagenesis and pore evolution with thin section observation, X-ray diffraction, scanning transmission electron microscope and vitrinite reflectance. The results show that the rock type of the2nd and 3rd members of Liushagang Formation in the Wushi Sag is dominated by quartz sandstone, with minor feldspathic quartz sandstone. The size fraction of grains is moderate to poor. The diagenesis of the sandstone has reached to Stage A of the middle diagenetic period. The pores are mainly primary intergranular and secondary dissolution types. The primary intergranular pores decrease with the compaction and cementation of sandstone, while the secondary pores increase with dissolution, which improve the physical property of reservoir.
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