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运用薄片鉴定、扫描电镜、包裹体测温、岩心观察等手段研究了川西新场构造带须二段砂岩中硅质胶结物的硅质来源及其对储层的影响。结果表明:研究区须二段硅质胶结物的主要产出形式为次生加大石英和孔隙充填自生石英,硅质来源有内部和外部2种来源。内部来源主要包括碎屑石英因压溶作用、砂岩内部的黏土矿物转化释放的游离硅,外部来源主要为下伏泥岩段的黏土矿物转化释放并通过裂缝向上运移进入须二段砂岩的SiO2和少量热液硅质来源。以不同岩石类型的硅质来源及其对储层的影响为基础,结合储层物性综合分析表明,须二段大部分硅质胶结物对储层起破坏作用,少量早期分散的次生加大石英对储层孔隙起一定的保持性作用。
The authors have studied the source of siliceous siliceous cements in the second member of the Xuerdian sandstone in the Xinchang tectonic belt and its effect on the reservoir formation by means of thin-slice identification, scanning electron microscopy, temperature measurement of inclusions and core observation. The results show that the main output forms of siliceous cements in the second member of the study area are secondary quartz and pore-filled authigenic quartz, with sources of internal and external sources of siliceous origin. The internal sources mainly include the dissociated silicon released by the clay minerals in the sandstone due to depressurization of clastic quartz. The external sources mainly include the clay minerals in the underlying mudstone that are transformed and released and migrated upward through the cracks into the SiO2 and A small amount of hydrothermal siliceous source. Based on the siliceous sources of different rock types and their effects on the reservoir, a comprehensive analysis of reservoir physical properties shows that most of the siliceous cement in the second member of Xujiahe section destroys the reservoirs, and the small amount of secondary dispersion of early dispersions increases Quartz reservoir pores play a certain role in maintaining.