R-Q因子分析在白云岩岩相识别中的应用:以鄂尔多斯盆地奥陶系白云岩为例  

R-Q Factor Analysis in Dolomite Facies Identification:Cases From the Ordovician Dolostone in Ordos Basin

作　　者：宁博 王起琮[2] 魏巍[2] 马瑶[2] 王妍[2] 石堃 Ning Bo;Wang Qicong;Wei Wei;Ma Yao;Wang Yan;Shi Kun(Shaanxi Huadi Survey and Design Consultation Co.,Ltd.,Xi＇an 710020;Xi＇an Shiyou Umverslty,Xi＇an 710065,China;The No.3 Gas Production Plant,Changqing Oilfield Company,PetroChina,Wushenqi Inner Monggol 017300,China)

机构地区：[1]陕西华地勘察设计咨询有限公司,西安710020 [2]西安石油大学,西安710065 [3]中国石油长庆油田分公司第三采气厂,内蒙古乌审旗017300

出　　处：《地质科技情报》2018年第4期61-67,共7页Geological Science and Technology Information

基　　金：国家"十三五"科技重大专项专题(2017ZX05005-002-004)

摘　　要：探讨了R-Q因子分析在白云岩岩相识别中的应用。通过薄片鉴定,明确了膏盐溶角砾白云岩、紊乱角砾白云岩、活跃回流渗透白云岩以及隐伏回流渗透白云岩的主要显微特征,在此基础上进行了阴极发光实验及主、微量元素分析测试,并对各元素特征值进行了R-Q因子分析。分析结果表明,膏盐溶角砾白云岩由于淡水溶蚀造成卤水型元素的流失以及淡水型元素的相对富集,使得主量元素中最相关的元素为Fe和Mg;因含不等量的残余灰质组分,造成与回流渗透白云岩最相关的元素为Ca和Mg;紊乱角砾白云岩中因黏土成分的增多,使得其富含各种吸附态分散元素,造成与其最相关的元素为稀土元素(Ce、Eu、Yb、La)、Ni、Sc和Na。研究结果表明:根据元素与元素之间、岩石与元素之间的相关性强弱,可以判别出不同成岩环境下的岩石类型。This paper mainly discusses the application of R-Q factor analysis in dolomite lithofacies identification.Through thin section analysis,this study identifies the main microscopic characteristics of karst breccia dolomite,disagreement of breccia dolomite,active backflow infiltration dolomite and buried and permeated dolomite.On this basis,R-Q factor analysis is applied to determine each element′s characteristics after cathodoluminescence experiments and the major elements and trace elements.The result indicates that the most relevant major elements of gypsum karst breccia dolomite are Fe and Mg,because fresh-water dissolution causes the loss of brine elements and relative enrichment of freshwater elements.The most relevant elements of the active backflow infiltration dolomite are Ca and Mg,because of unequal amounts of residual grey matter components.The disagreement of breccia dolomite′s most relevant elements are rare earth elements including（Ce＋Eu＋Yb＋La）,Ni,Sc and Na,because with the clay content increase,the rock facies rich in various adsorption state dispersed elements.The paper concludes that rock types under different diagenetic environments can be distinguished by the correlation between elements-elements and rocks-element.

关 键 词：R-Q因子分析 地球化学 白云岩岩相 奥陶系白云岩 鄂尔多斯盆地 

分 类 号：P586[天文地球—岩石学]