鄂尔多斯盆地南缘上石炭统本溪组泥岩元素地球化学特征及沉积环境启示  

Elemental geochemical characteristics of mudstones in Upper Carboniferous Benxi Formationin southern Ordos Basin and their enlightenment to sedimentary environment

作　　者：胡芸冰 刘燕[3,4] 郭英海[1,2] 刘文香[3,4] 张治波[1,2] 杨晓凯 HU Yunbing;LIU Yan;GUO Yinghai;LIU Wenxiang;ZHANG Zhibo;YANG Xiaokai(School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;Key Laboratory of Coalbed Methane Resources & Reservoir Formation Process of Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;Exploration and Development Research Institute of Petro China Changqing Oilfield Company, Xi′an, Shaanxi 710018, China;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi′an, Shaanxi 710018, China)

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221116 [3]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [4]低渗透油气田勘探开发国家工程实验室,陕西西安710018

出　　处：《山东科技大学学报（自然科学版）》2022年第1期13-23,共11页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(41772130);长庆油田分公司勘探开发研究院项目(ZY19-XA408-FW852)。

摘　　要：为揭示鄂尔多斯盆地高桥-宜川地区本溪组的沉积环境,选取研究区本溪组2口探井的泥岩样品,采用ICP-MS对其进行主微量元素测试,结果显示,研究区泥岩的微量元素环境指标特征参数差别较大,说明其形成于不同的沉积环境;稀土元素球粒陨石标准化曲线呈右倾弱Eu负异常的V型特征,微量元素地壳标准化曲线特征表现一致。表明鄂尔多斯盆地东南缘的本溪组物源来自地壳。高桥地区以陆相淡水-海水为主,形成于温湿-氧化环境,海平面变化较为频繁;宜川地区以咸水-海水为主,形成于温湿-干旱-温湿的弱氧化环境,高桥地区的沉积环境更为复杂。To reveal the sedimentary environment of Benxi Formation in Gaoqiao-Yichuan Area of Ordos Basin,this study selected mudstone samples of Benxi Formation from two exploratory wells in the study area and tested their main trace elements by using ICP-MS.The results show that the characteristic parameters of trace element environment indexes of mudstones in the Gaoqiao and Yichuan Areas differ greatly and their formation environments are different too.The rare earth element spheroidal meteorite standardization shows a V-shaped feature with a weak Eu-negative anomaly of right dip,and the trace element crustal standardization curves are consistent,indicating that the source of Benxi Formation at the southeastern margin of Ordos Basin is from the crust.Dominated by terrestrial freshwater-seawater,the Gaoqiao Area is formed in a warm-wet-oxidizing environment with more frequent sea level changes,whereas the Yichuan Area,dominated by brackish water-seawater,is formed in a warm-wet-arid-warm-wet weakly oxidizing environment.The sedimentary environment in the Gaoqiao Area is relatively more complex.

关 键 词：元素地球化学 古水温 氧化还原环境 本溪组 鄂尔多斯盆地 

分 类 号：P595[天文地球—地球化学]