Title

ELEMENT GEOCHEMISTRY CHARACTERISTIC RESPONSE FOR KARSTIFICATION IN THE TAHE OILFIELD

作者

刘显凤蔡忠贤云露徐微

Authors

Liu Xianfeng Cai Zhongxian Yun Lu Xu Wei

单位

中国地质大学, 资源学院, 武汉, 430074 2. 中国地质大学, 研究生院, 武汉, 430074 3. 中国地质大学, 构造与油气资源教育部重点实验室, 武汉, 430074 4. 中国石化, 西北分公司勘探开发规划设计研究院, 乌鲁木齐, 830001 5. 中海石油研究中心, 勘探研究部, 北京, 100027

Organization

China University of Geosciences, Faculty of Resources, Wuhan, Hubei 430074, China 2. China University of Geosciences, Graduate School, Wuhan, Hubei 430074, China 3. China University of Geosciences, Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, Wuhan, Hubei 430074, China 4. Design and Planning Institute of Northwest Petroleum Bureau, SINOPEC, Urumqi, Xinjiang 830011, China 5. Exploration Research Dept.CNOOC Research, Beijing 100027, China

摘要

塔河油田位于塔里木盆地北部阿克库勒凸起西南缘。该区自加里东中晚期到海西早期经历多次构造抬升,奥陶系碳酸盐岩地层长期暴露地表,遭受了强烈的大气淡水淋滤溶蚀作用,形成了一套复杂的表生岩溶系统。通过对塔河油田主体区溶洞砂泥质充填物硼、矾、镓、铷等微量元素以及稀土元素的研究,大部分样品表现出淡水岩溶特征,但T615井等4口井溶洞充填物元素地球化学具有海水成因特征,表明石炭纪早期广泛海侵期间产生的混合水(淡水—海水)岩溶作用可能对塔河地区奥陶系岩溶体系具有一定程度的叠加改造作用。

Abstract

The Tahe Oilfield is located in the southwest margin of Akekule Uplift in north Tarim Basin.It went through several times tectonic uplift from the late Caledonian to the early Hercynian,this lead to Ordovician carbonate formation be exposed to the surface for a long time and suffering from intense air fresh-water weathering,leaching and dissolving and developed a set of complicated superficial karst system.Throuth research of arenaceous and pelitic karstic cave deposit about its' trace element such as B,V,Ga,Rb,etc,and REE characteristic in the main region of the Tahe Oilfield,it indicated that most samples took on characteristic of fresh-water corrosion.While,samples of the four wells such as T615 showed influenced by seawater,it can be indicated that seawater-freshwater mixing corrosion caused by widely marine transgression in early of Carboniferous Period probably overlay and improved the Ordovician karst system in the Tehe Oilfield.

关键词：

微量元素; 稀土元素; 砂泥质充填物; 岩溶作用; 奥陶系; 塔河油田;

Keywords:

trace element; rare earth element arenaceous and pelitic karstic cave deposit; karstification Ordovician; Tahe Oilfield;

基金项目

国家重点基础研究发展计划(973计划)项目(2005CB422105)资助

DOI

https://doi.org/10.11781/sysydz200903270

塔河油田岩溶作用元素地球化学的特征响应