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岩溶缝洞型碳酸盐岩储层是塔河油田奥陶系最重要的储层类型,深入研究古岩溶类型、发育期次和发育模式对认识储层的发育规律具有重要意义。根据岩溶水的特点,可分为大气水和非大气水岩溶两类,大气水岩溶主要发育在表生条件下。结合塔河油田奥陶系古岩溶发育的地质特点,可以将其表生作用过程大致分为5个阶段,分别是加里东中期Ⅰ幕、Ⅱ幕、Ⅲ幕,海西早期和海西晚期。针对各个阶段的岩溶发育特点,建立了相应的岩溶发育模式。
Karst fractured carbonate reservoirs are the most important reservoir type of Ordovician in Tahe Oilfield. It is of great importance to study the types, development stages and development patterns of ancient karstification to understand the law of reservoir development. According to the characteristics of karst water can be divided into two kinds of atmospheric water and non-atmospheric water karst, atmospheric water karst mainly in superficial conditions. Combined with the geological characteristics of the Ordovician paleokarst development in the Tahe Oilfield, epiphytic processes can be roughly divided into five stages, namely Caledonian Stage I, II, III, Early Hercynian and Hercynian. According to the karst development characteristics of each stage, a corresponding karst development model was established.