塔里木盆地东部寒武系沉积特征及优质白云岩储层成因

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。

Cambrian Sedimentary Characteristics and Origin of High-Quality Dolomite Reservoirs in Eastern Tarim Basin

The discovered Cambrian dolomites in Milan well 1 and Yingdong well 2 are important reservoir rocks in the carbonates of the Lower Paleozoic, Eastern Tarim basin. The high-quality dolomite reservoir rocks mainly occurred in carbonate shallow ramp deposits. Geochemical analyses of carbon and oxygen isotopes, ordering determination and inclusions suggest that the dolomites may be divided into two types: the first is the high temperature hydrothermal fluid dolomitization, the second is the seepage reflux dolomitization. The high temperature hydrothermal fluid dolomitization is crucial to the formation of high-quality dolomite reservoir rocks. The formation of high-quality dolomite reservoir rocks is the result of the seepage reflux dolomitization being overprinted by the high temperature hydrothermal fluid dolomitization in the region.