南海西沙群岛西科1井上新统-全新统碳酸盐岩微相分析  

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

作　　者：李晓[1] 刘娜[1] 吴仕玖 刘才 徐守立 刘立[1] 赵爽[1] 于亚苹 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]中海石油(中国)有限公司湛江分公司研究院,湛江524057

出　　处：《科技导报》2016年第7期103-110,共8页Science & Technology Review

基　　金：中国海洋石油总公司资助项目(CNOOC-2013-ZJ-01);国家科技重大专项(2011ZX05025-002)

摘　　要：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。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.

关 键 词：南海 西沙群岛 西科1井 生物礁动 碳酸盐岩 微相 

分 类 号：P618.13[天文地球—矿床学]