柴达木盆地南翼山油田卤水水化学及氢氧同位素地球化学特征  

Hydrochemical,Hydrogen and Oxygen Isotopic Characteristics of Nanyishan Oilfield Brine,Qaidam Basin

作　　者：徐凯 许建新[1,2] 常政 韩积斌 李阳山[1,2,3] 高雪峰 赵为永 XU Kai;XU Jian-xin;CHANG Zheng;HAN Ji-bin;LI Yang-shan;GAO Xue-feng;ZHAO Wei-yong(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China;Research Institute of Exploration and Development,Qinghai Oilfield Company,PetroChina,Dunhuang,736202,China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [2]青海省盐湖地质与环境重点实验室,青海西宁810008 [3]中国科学院大学,北京100049 [4]中国石油青海油田分公司勘探开发研究院,甘肃敦煌736202

出　　处：《盐湖研究》2021年第4期43-51,共9页Journal of Salt Lake Research

基　　金：青海省科技厅项目(2019-0301-ZJC-0108,2020-ZJ-932Q,2020-ZJ-732)。

摘　　要：南翼山油田卤水是钾钙硼等元素的富集区,具有较高的开采利用价值。开发利用油田卤水,需要对其演化过程有较深入的研究。采用地层岩性与水化学特征及氢氧同位素地球化学特征相结合的方法,对南翼山油田卤水的形成与演化过程进行探讨,得到初步结论:南翼山油田卤水水化学类型主要为氯化钙型,具有高矿化度、高钙、低镁和低硫酸根的特点。油田卤水起源于大气降水,下渗过程中溶滤第三系岩盐沉积物,经过一系列水岩相互作用,并与深部地热水、岩浆水混合,最终形成现在的水体。Nanyishan oilfield brines are enriched in potassium,calcium,boron and other elements and have excellent potential for development and utilization.Indepth study on the origin and formation of oilfield brines provides important information about the efficient exploitation and utilization of these resources.Brine samples collected from petroleum wells in the oilfield area were analyzed for chemical compositions and for hydrogen and oxygen isotopes.Combining with the lithology,the results show that Nanyishan oilfield brines are CaCl_(2) type.They were enriched in Ca^(2+) and were depleted in Mg^(2+),SO_(4)^(2-) and had high salinity.These brines were initially originated from meteoric water,leaching the Tertiary salt-bearing sediments and experiencing water-rork interaction in the process of migration,and mixing with deep geothermal water and magmatic water.

关 键 词：柴达木盆地 油田卤水 水化学特征 水岩相互作用 氢氧同位素 

分 类 号：P597.2[天文地球—地球化学]