| PDF: | |
| Time: | 2006 |
| Journal: | Xinjiang Geology |
| Volumn: | 24 |
| Issue: | 4 |
| Pages: | 381-383 |
| Type: | Other |
| Author: | Youfeng Gao,Wanzhu Liu,Pujun Wang,Xuefeng Bai |
Abstract: | The main sandstone types in Tushibulake Formation of Lower Siluric are feldspathic lithic sandstone and lithic sandstone in Kongquehe region of Xinjiang.The mechanical compaction and cementation are the main factors causing the loss of porosity for the sandstones,while the dissolution and recrystallization improve the properties in the later diagenetic stage.According to the lithologic characteristics and the diagenesis,we divide the sandstone of Tushibulake into three members.The below member suffered compaction strongly and a small part of intragranular solution pores were developed with the average area percent of pore of 7.6% which resulted from dissolution.Cementation is primary in the middle member.Solution pore in the cement could be found,resulted from dissolution in the later period and its average area percent of pore is 10.5%.The upper member is the best reservoir for the well-developed secondary pores with the average area percent of pore of 13.3%,resulted from the dominating dissolution and recrystallization as well as weak compaction. |