Characteristics of Quartz Sandstones and Its Reservoir Significance of Xujiahe Formation in Yuanba Area , Northeastern Sichuan
详细信息
- 责任者：Chen Bo (Geoscience School ; Yangtze University ; Jingzhou 434023 ; China) ; Shen Junjun
- 刊名：Acta Sedimentologica Sinica
- 出版年：2012
- 卷期：30(1)
- 关键词：石英砂岩 ; quartz sandstone ; 裂隙型储集层 ; fractured reservoirs ; 四川 ; Sichuan Province
- 页码：p.92-100
- 图表：10 illus., 10 refs.
- 分类号：1003
- issnNo：ISSN1000-0550
- isbnNo：CN62-1038/P
摘要
In recent years,much more tight-gas of the late Triassic Xujiahe Formation are discovered in Yuanba which is located in the northeastern Sichuan foreland basin in China. Quartz sandstones are found first in the Upper Triassic Xujiahe Formation in Sichuan Basin.Because of strong digenesis process (Mesogenesis to Telogenesis),Xujiahe sandstones are tight-gas reservoir with porosity ranging from 5.0%～11.0% and average permeability 1.9×10-3μm2.According to much more casting thin-section,the primary pores little occur in all kinds of sandstones.The secondary pores are major pore types that come from dissolution of minerals and fragments. The analysis shows quartz sandstones as reservoirs related to provenance come from Michang thrust belt,quartz grains with cracks are not only in quartz sandstones,but also other kinds of sandstones for example lithic sandstones have quartz mineral with cracks in Yuanba area,so crack quartz maybe come from ancient source rocks.
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