南海西沙群岛西科1井上新统-全新统碳酸盐岩微相分析

 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。

Analysis of carbonate microfacies in Pliocene-Holocene,in Well XK-1, the Xisha Islang,South China Sea

Well XK-1, as a fullcoring scientific drilling well, provides an opportunity for comprehensive and systematic study of carbonate. This paper makes a quantitative analysis of carbonate microfacies, through careful observation of core samples and systematic analysis of thin sections, focusing on Pliocene-Holocene component types, microfacies types, and their vertical characteristics. The component of the carbonate has the characteristics of high grain content, as well as low matrix and cement content. The component microfeatures can be seen in 19 different types, mainly including the bioclast packstone, the bioclast wackstone, the coral framestone, and the bryozoa bindstone. The vertical distribution of carbonate microfacies shows that the carbonare experiences an agitated water-alternate deposition in the strongly agitated water and an agitated water-alternate deposition in the agitated water and the weakly agitated water, in Ledong formation; while it experiences the alternate deposition in the strongly agitated water, the agitated water and the weakly water-agitated water in Yingehai formation.