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西科1井为全取心科学钻井。采用定量微相分析方法,通过精细的岩芯观察和系统的薄片分析,对西科1井上新统-全新统碳酸盐岩微相进行精细研究,以阐明各组分类型和微相类型的纵向分布特征。研究表明,研究区碳酸盐岩表现出颗粒含量高,基质和胶结物含量低的特点。根据碳酸盐岩组分的显微特征,识别出19种微相类型,主要为生屑泥粒灰岩、生屑粒泥灰岩、珊瑚骨架灰岩和苔藓动物粘结灰岩。碳酸盐岩微相纵向分布表明:乐东组经历了动荡水沉积—强动荡水与动荡水交互沉积—动荡水与弱动荡水交互沉积。莺歌海组经历了强动荡水沉积、动荡水与弱动荡水交互沉积—动荡水沉积。
West Branch 1 well for the whole coring scientific drilling. By means of quantitative micro-facies analysis, fine core observation and systematic thin-section analysis were used to study finely the Neoproterozoic-Holocene carbonate microfacies in Well Xike-1 to clarify the compositional and microfacies types Vertical distribution characteristics. The study shows that the carbonate rocks in the study area show the characteristics of high content of particles and low content of matrix and cements. Based on the microscopic features of the carbonate components, 19 microfacies types are identified, chiefly bioclastic limestone, raw crumb limestone, coral skeleton limestone and bryozoic bonded limestone. Longitudinal distribution of carbonate microfacies shows that Ledong Formation experienced turbulent water deposition - the interaction between strong turbulent water and turbulent water - the interaction between turbulent water and weak turbulent water. Yinggehai Formation experienced strong turbulent water deposition, turbulent water and weak turbulent water interaction sedimentation - turbulent water deposition.