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长庆气田下古生界气藏是深埋藏的岩溶型碳酸盐岩气藏 ,具有侵蚀沟谷分布复杂、气层薄、非均质性强、单井产量差异大等特点。为了客观描述气藏储集层特征、寻找天然气高产富集规律、提高开发井钻探成功率 ,根据气田地质特点 ,进行了沉积 成岩微相、古地貌形态和储集层定量化描述、小幅度构造描述、孔隙结构研究、气水分布规律研究及储集层横向预测 ,结论是气井高产在微观上受控于溶蚀孔洞、孔喉结构和裂缝发育程度 ,在宏观上受控于古地貌、小幅度构造和沉积 成岩微相等地质条件。
The lower Paleozoic gas reservoirs in Changqing gas field are deep-buried karst carbonate reservoirs with the characteristics of complex distribution of erosion gullys, thin gas fields, strong heterogeneity and large differences in single-well production. In order to objectively describe the characteristics of gas reservoirs, search for the law of high-yield and enrichment of natural gas, and improve the drilling success rate of development wells, the sedimentary diagenetic microfacies, paleogeomorphology and reservoir quantitative description are described according to the geological characteristics of gas fields. It is concluded that the high gas production is microscopically controlled by the dissolution pores, pore-throat structure and the degree of fracture development, and is controlled macroscopically by paleogeomorphology, small amplitude Structural and sedimentary diagenetic microfacies and other geological conditions.