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英东2井、米兰1井在塔里木盆地东部寒武系发现的优质白云岩储层是目前在该区下古生界勘探中发现的最有利储集层,该优质白云岩储层主要发育于碳酸盐浅缓坡沉积。通过碳氧同位素、白云石包裹体均一温度和白云石有序度测定及分析后指出,塔东地区优质白云岩储层属于早期回流渗透白云岩化后又叠加高温热液白云岩化形成;在该地区的2种主要成因模式中(渗透回流白云岩化和高温热液白云岩化),高温热液白云岩化模式对优质白云岩储层的形成起决定作用。
The high-quality dolomite reservoirs discovered in the eastern Cambrian of the Inongdong 2 well and the Milano-1 well in the eastern part of the Tarim Basin are the most favorable reservoirs currently discovered in the Paleozoic exploration in this area. The high-quality dolomite reservoirs mainly develop in Carbonate shallow sediment deposition. According to the determination of the carbon and oxygen isotopes, the homogenization temperature of dolomite inclusions and the degree of dolomite ordering, it is pointed out that the high-quality dolomite reservoirs in the Tadong area belong to the dolomitization of early infiltration and infiltration and are superimposed by dolomitization of high-temperature hydrothermal fluids. The two major generative models in the area (infiltration back-dolomitization and high-temperature hydrothermal dolomitization) and high-temperature hydrothermal dolomitization patterns play a decisive role in the formation of high-quality dolomite reservoirs.