泌阳凹陷下二门地区核桃园组元素地球化学特征及物源区分析  

Geochemical characteristics of elements and provenance analysis of Hetaoyuan formation in the Xia’ermen area,Biyang Sag

作　　者：刘蕊 LIU Rui(Exploration&Development Research Institute of Henan Oilfield Company,SINOPEC,Nanyang,Henan 473132,China)

机构地区：[1]中国石化河南油田分公司勘探开发研究院,河南南阳473132

出　　处：《石油地质与工程》2023年第2期51-55,共5页Petroleum Geology and Engineering

摘　　要：为了深化下二门地区核桃园组元素地球化学特征及物源研究,利用ICP-AES对下二门及其周缘核桃园组砂岩元素组成进行分析,并探讨物源区砂岩成分的相似程度、母岩类型和风化强度。结果表明,下二门地区核桃园组沉积时期,元素聚类分析结果存在明显南北差异;化学组分变化指标(ICV)和化学蚀变作用指标(CIA)均反映区内砂岩的碎屑成分未受到强烈风化作用,为低等风化条件下的初次沉积;区内北部受侯庄物源影响,为中远源沉积,母岩是酸性岩浆岩,而南部主要为梨树凹物源,母岩为变质岩。In order to make a deep research on the geochemical characteristics of elements and provenance analysis of Hetaoyuan formation in Xia’ermen area,the element composition of sandstone in Xia’ermen and its surrounding Hetaoyuan formation was analyzed by ICP-AES,and the similarity of sandstone composition,parent rock types and weathering intensity in the provenance area were discussed.The results show that the element cluster analysis results of Hetaoyuan gormation in Xia’ermen area are obviously different from north to south,both the chemical composition change index(ICV)and the chemical alteration index(CIA)reflect that the clastic composition of sandstone in the area is not strongly weathered,and it is the primary sedimentation under low weathering conditions.The northern part of the area is affected by Houzhuang provenance,which is of middle and far source sedimentation.The parent rock is acidic magmatic rock,while the southern part is mainly Lishu’ao provenance,and the parent rock is metamorphic rock.

关 键 词：下二门 元素地球化学特征 母岩类型 聚类分析 

分 类 号：P588[天文地球—岩石学] P595[天文地球—地质学]