塔里木盆地玉北地区奥陶系成岩作用研究

摘要

玉北地区奥陶系是塔里木盆地海相碳酸盐岩油气勘探的重要目的层和产层。通过观察岩石薄片和铸体薄片，结合岩心观察、扫描电镜、阴极发光，辅以地化资料等，对玉北地区奥陶系成岩作用进行研究，认为：玉北地区奥陶系的主要建设性成岩作用有岩溶、白云化、重结晶和溶蚀作用等，破坏性成岩作用有压实-压溶、胶结、硅化和充填作用等，此外，还有去白云化、褐铁矿化、泥晶化等对储集性能影响极小的成岩作用，可划分为同生成岩阶段、早—晚成岩阶段和表生成岩阶段。%Ordovician formation of Yubei area is an important purpose and production layer of oil and gas exploration about marine carbonate in Tarim basin.By observing rock and cast thin slice,combining the core observation,scanning electronic microscope,cathodoluminescence, supplemented by geochemical data and so on,the author studied the diagen-esis of Ordovician formation inYubei area,the study showsthat:the major constructive diagenesises of Ordovician forma-tion in Yubei area are karst,dolomitization recrystallization and dissolution,etc.The major destructive diagenesises of Or-dovician formation in Yubei area are compaction-pressure solution,cementation silicon and filling the role,in addition, there are undolomitization,Limonitization,micritization which impact on reservoir properties minimally.Ordovician for-mation in Yubei area can be divided into Generation stage with rock,early middle and late diagenetic stage and epidiagen-esis stage.