收稿日期: 2014-06-05
修回日期: 2014-09-18
网络出版日期: 2015-03-10
基金资助
国家自然科学基金项目（编号:41202043）；中国石油科技创新基金项目（编号:2014D-5006-0108）联合资助.
Selica Sources of Quartz Cements and Its Effects on the Reservoir in Tight Sandstones:A Case Study on the 2th Member of the Xujiahe Formation in Xinchang Structural Belt,Western Sichuan Depression
Received date: 2014-06-05
Revised date: 2014-09-18
Online published: 2015-03-10
罗龙，孟万斌，冯明石，谭先锋，张世华，孙茹，肖春晖 . 致密砂岩中硅质胶结物的硅质来源及其对储层的影响——以川西坳陷新场构造带须家河组二段为例[J]. 天然气地球科学, 2015 , 26(3) : 435 -443 . DOI: 10.11764/j.issn.1672-1926.2015.03.0435
By means of thin section analysis,scanning electron microscopy,testing temperature of the fluid inclusion,core observation,characteristics of the quartz cements and their silica sources in the 2th member of the Xujiahe Formation of Xinchang structural belt had been studied.The results show that the occurrence of quartz cements included overgrowth quartz and pore-filled authigenic quartz.Silica sources of the quartz cements include internal and external sources.Internal silica sources came from clay-mineral transformations inside sandstone and from the pressure dissolution of quartz grains.External sources include the silica that moved into the sandstones from underlain mudstones through fractures,and a small amount of silica supplied by hydrothermal fluid.The relationship between quartz cements and reservoir property in different types of sandstones indicates quartz cements mostly destroy the reservoir quality,however,some early formed overgrowth quartz sporadically filled in intergranular porosity in some extent can protect the reservoir property.
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