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南泥湾油田九龙泉地区延长组长3油层组是重要的储集层之一。利用薄片鉴定、扫描电镜、X射线衍射等多种测试分析手段,对九龙泉一带长3储层的岩石学特征、孔隙结构特征、物性特征、成岩作用特征及对储层的影响进行了深入的研究。长3储集岩主要为细一中粒长石砂岩,具有成分成熟度较低,结构成熟度较高的特征;主要的成岩作用有压实作用、压溶作用、胶结作用和溶蚀作用。经过综合分析,确定出研究区长3储集岩目前处于晚成岩阶段的A期。
Chang 3 reservoir of Yanchang Formation in Jiulongquan area of Nanniwan Oilfield is one of the important reservoirs. Using the methods of thin film identification, scanning electron microscopy and X-ray diffraction, the petrology, pore structure, petrophysical characteristics, diagenetic characteristics and reservoir influence of Chang3 reservoir in the area of Jiulongquan were studied in depth the study. Chang 3 reservoir rocks are mainly fine-grained feldspathic sandstones with the characteristics of low maturity and high structural maturity. The main diagenesis is compaction, pressure solution, cementation and dissolution. After a comprehensive analysis, it is confirmed that reservoir 3 in the study area is in late A diagenetic stage.