Cambrian Sedimentary Characteristics and Origin of High-Quality Dolomite Reservoirs in Eastern Tarim Basin
塔里木盆地东部寒武系沉积特征及优质白云岩储层成因

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.