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利用铸体薄片显微镜下观察与统计,结合扫描电镜研究,对白云凹陷珠江组砂岩的岩石学特征进行研究,结合成岩演化分析其对珠江组储层砂岩物性的影响。珠江组砂岩主要为岩屑长石砂岩和长石岩屑砂岩,填隙物以杂基和碳酸盐为主,孔隙类型主要以粒间溶孔为主,其次为粒内溶孔和原生粒间孔。成岩演化分析可知,早期中等压实作用为原始孔隙的保存提供了保证;碳酸盐胶结物是珠江组砂岩储集变差的主要因素;而溶蚀作用是使得砂岩储集物性变好的重要因素,酸性流体的注入为长石、岩屑及石英等碎屑颗粒的溶蚀提供了物质基础。
Using the observation and statistics of cast thin slab microscopy and the scanning electron microscopy study, the petrologic characteristics of the Zhujiang Formation sandstone in the Baiyun Sag have been studied. Based on the diagenetic evolution, the influence of the petrology on the petrophysical properties of the Zhujiang Formation sandstone has been analyzed. The sandstone of Zhujiang Formation is mainly feldspar feldspathic sandstone and feldspar lithic sandstone. The interstitial inclusions are mainly composed of miscellaneous and carbonate. The pore types are dominated by intergranular dissolved pores, followed by intragranular dissolved pores and primary particles Between the holes. The analysis of diagenesis shows that the early medium compaction provides a guarantee for the preservation of the original pores. Carbonate cement is the main factor for the deterioration of sandstone reservoir in the Zhujiang Formation. The dissolution is an important factor that makes the sandstone reservoir properties better The injection of acid fluid provides the material basis for the dissolution of debris such as feldspar, cuttings and quartz.