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通过岩心观察和薄片鉴定,确定塔东寒武系白云岩以次生白云岩为主,分为交代白云岩和胶结白云岩两类,发育在上寒武统的突尔沙克塔格组,分布在塔东东部和西部的构造带上。地球化学分析表明,塔东寒武系白云岩经历了超盐度、埋藏和热液3种白云岩化环境,揭示了研究区的渗透回流白云岩化、埋藏白云岩化和热液白云岩化3种模式;塔东白云岩优质储集层主要受到碳酸盐岩沉积相带展布和白云岩成因叠加模式的控制。地震相分析和沉积相研究表明:塔东西部为台地边缘-台地边缘斜坡,中部为深海盆地,东部为中缓坡-外缓坡;西部的台地边缘和东部的中缓坡白云岩的分布厚度大;储集性能好的白云岩主要为渗透回流白云岩化叠加埋藏白云岩化或者热液白云岩化作用而形成。
Through core observation and thin section identification, it is determined that the Tadong Cambrian dolomite is mainly composed of secondary dolomite, which is divided into dolomite and cementation dolomite, Located in the east and west of Tadung tectonic belt. Geochemical analysis shows that the Tadong Cambrian dolomite experienced three dolomitization environments of ultra-salinity, burial and hydrothermal, revealing the infiltration of dolomitization, burial dolomitization and hydrothermal dolomitization in the study area 3 models. The high-quality reservoirs in the Tarong dolomite are mainly controlled by the sedimentary facies of carbonate sedimentary facies and dolomite superimposition. Seismic facies analysis and sedimentary facies studies show that: the east and west of Tarong are the margin of the platform margin - the margin of the platform margin, the middle is the deep sea basin, the middle is the gentle slope - the outer gentle slope; the margin of the platform margin in the west and the middle gentle slope dolomite of the east are thick; The dolomites with good performance are mainly formed by infiltration dolomitization superimposed with burial dolomitization or hydrothermal dolomitization.