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
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.
LUO Long，MENG Wan-bin，FENG Ming-shi，TAN Xian-feng， ZHANG Shi-hua，SUN Ru，XIAO Chun-hui . 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[J]. Natural Gas Geoscience, 2015 , 26(3) : 435 -443 . DOI: 10.11764/j.issn.1672-1926.2015.03.0435
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