塔里木盆地东部上寒武统白云岩沉积特征  

Sedimentary Characteristics of Upper Cambrian Dolomite in Eastern Tarim Basin

作　　者：马锋[1] 顾家裕[1] 许怀先[1] 邬光辉[1] 李洪辉[1] 邵龙义[2] 朱长见[3] 刘永福[3] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国矿业大学资源系,北京100083 [3]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《新疆石油地质》2009年第1期33-37,共5页Xinjiang Petroleum Geology

基　　金：中国石油中青年创新基金成果项目(2007120624)资助

摘　　要：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。By means of the core observation and thin section analysis, the dolomite of Cambrian in eastern Tarim basin is dominated by secondary dolomite which is divided into replacement dolomite and cemented dolomite. The development area of the dolomite is the Upper Cambrian Tuershaketage formation and the distribution area is in the east and west tectonic zones of Tarim basin. Geochemical analysis indicates that three dolomitization environments exist including extrasalinity, bury and hydrothermal fluid, and three dolomitization models are revealed including penetration reflux dolomitization, burial dolomitization and hydrothermal fluid dolomitization. The principal control factors for the high quality dolomite reservoir are carbonate sedimentary facies zones and dolomite genetic superimposed models. The seismic facies and the sedimentary facies analyses indicate that the facies of the west of eastern Tarim basin is carbonate platform margin-platform margin slope, the middle is deep-sea basin and the east is middle ramp-external ramp. The thickness of the dolomites in the west carbonate platform margin and the east middle ramp is big. The dolomite with high reservoir quality which is mainly formed by penetration reflux dolomitization superimposed with the burial dolomitization or hydrothermal fluid dolomitization.

关 键 词：塔里木盆地 寒武系 白云岩 沉积相 储集层 

分 类 号：TE112.221[石油与天然气工程—油气勘探]