碳酸岩对于形成油气藏的作用难以重新估价。在乌拉尔——伏尔加一系列地区和齐曼诺——皮朱尔含油气省的碳酸岩地层中发现了一些大型油藏(如米什金油田、楚特尔——基耶郭波油田)和储量很大的气藏(乌科特利气田及奥伦堡气田)。在所有上述油田及与之类似的一些油田中,很厚的含油气碳酸岩被页状泥岩或盐岩所覆盖,泥岩与盐岩为区域性盖层。对这些岩石的高度密封性没有人怀疑。但对碳酸岩 The role of carbonate rocks in the formation of reservoirs is difficult to re-evaluate. A number of large reservoirs (such as the Mishkin field, the Chuet-Chieuowo oilfield) have been identified in a series of carbonate zones in the Ural-Volga region and in the Kimano- Large reserves of gas reservoirs (Ukotley gas field and the Orenburg gas field). In all of these fields and similar fields, very thick hydrocarbon-bearing carbonate rocks are covered by sheet-like mudstone or salt rock, with mudstone and salt rock as regional caprock. No one doubts the high degree of tightness of these rocks. But for carbonate rocks