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在55口井岩心、300片薄片观察的基础上,结合地球化学分析资料,系统研究了塔河油田南部盐下地区碳酸盐岩储层的成岩作用类型。研究表明:研究区存在胶结作用、溶蚀(或岩溶)作用、压溶作用、硅化作用、破裂作用、白云化作用和重结晶作用等多种成岩作用类型。溶蚀作用(或岩溶)分为4期,依次为同生期大气水溶蚀、加里东中期大气水岩溶、海西早期大气水岩溶以及海西晚期埋藏热液溶蚀作用,其中加里东中期大气水岩溶作用及海西早期大气水岩溶作用对改善区内碳酸盐岩储层物性具有重要意义。在此基础上,进一步分析了研究区成岩作用序列及孔隙演化。
Based on the observation of 55 cores and 300 thin slices, combined with the geochemical analysis data, the types of diagenesis of carbonate reservoirs in the Yansixi area of southern Tahe Oilfield are systematically studied. The results show that there are many types of diagenesis such as cementation, dissolution (or karst), pressure solution, silicification, rupture, dolomization and recrystallization in the study area. The dissolution (or karstification) is divided into four phases, followed by atmospheric water erosion in the same period, atmospheric water karst in the Middle Caledonian, atmospheric water karstification in the Hercynian and the late Hercynian burial hydrothermal dissolution. The Caledonian atmospheric water karstification And the early Hercynian air karstification plays an important role in improving the physical properties of carbonate reservoirs in the area. On this basis, the diagenetic sequence and pore evolution of the study area are further analyzed.