柴达木盆地西部第三系油田水水文地球化学特征

doi:10.11743/ogg20140107

石油与天然气地质 ›› 2014, Vol. 35 ›› Issue (1): 50-55.doi: 10.11743/ogg20140107

柴达木盆地西部第三系油田水水文地球化学特征

李建森¹, 李廷伟¹, 彭喜明², 韩元红³, 李中平³, 马海州¹

1. 中国科学院青海盐湖研究所, 青海西宁 810008;
2. 西北大学地质学系, 陕西西安 710069;
3. 中国科学院地质与地球物理研究所油气资源研究重点实验室, 甘肃兰州 730000

收稿日期:2012-11-09 修回日期:2013-12-24 出版日期:2014-02-08 发布日期:2014-03-26
作者简介:李建森（1987—），男，助理工程师，水文地球化学。E-mail：yanhuyanjiu@163.com。
基金资助:
国家自然科学青年基金项目（41003013）；国家科技基础性工作专项（2012FY112600）；国家重点基础研究发展计划（“973”计划）项目（2011CB403004）。

Hydrogeochemical behaviors of oilfield water in the Tertiary in western Qaidam Basin

Li Jiansen¹, Li Tingwei¹, Peng Ximing², Han Yuanhong³, Li Zhongping³, Ma Haizhou¹

1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China;
2. Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China;
3. Key Laboratory of Petroleum Resources Research, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China

Received:2012-11-09 Revised:2013-12-24 Online:2014-02-08 Published:2014-03-26

摘要/Abstract

摘要： 柴达木盆地西部第三系油田水具有高矿化度特征，钾、硼、锂等离子达到工业开采品位，氢同位素值分布在-75.61‰~13.35‰，氧同位素值分布在-7.68‰~10.58‰。综合分析油田水化学成分、水化学参数组合以及氢氧同位素特征推断：柴达木盆地西部第三系油田水起源于大气降水，为典型陆相成因，为大气降水沿深大断裂下渗并经历了“深循环”作用形成，同时有深源岩浆流体的参与。油田水高矿化度特征与盐类矿物溶解和蒸发浓缩有关，钾、硼、锂等元素受深源流体控制，Ca²⁺和HCO₃^-主要来源于碳酸盐矿物溶解，油田水高Ca²⁺、低Mg²⁺的特征与演化过程中白云石交代方解石以及方解石溶解有关，充分的水-岩反应与深源流体的加入导致柴达木盆地西部第三系深成CaCl₂型油田水的形成。同时，初步推断南翼山地区第三系可能具有找钾意义。

关键词: 氢氧同位素, 地球化学特征, 油田水, 第三系, 柴达木盆地西部

Abstract: The elements and hydrogen and oxygen isotope geochemistry analysis of oilfield water in the Tertiary in western Qaidam basin shows high salinity and abundant ions of potassium,boron and lithium of industrial mining grade.The analysis also reveals a hydrogen isotope value distribution of 75.61‰ to 13.35‰ and an oxygen isotope value distribution between -7.68‰ and 10.58‰.Combining these results with chemical analysis of the water,we concluded that the water was of typical terrestrial origin and was sourced from meteoric water,which seeped down along deep faults and was in-fluenced by deep-sourced magmatic fluids during its "deep circulation".The high salinity of the water may be caused by dissolution of saline minerals and their concentration through evaporation.Potassium,boron and lithium are mostly controlled by deep-sourced fluids and ions like Ca²⁺ and HCO₃^- are mainly sourced from dissolution of carbonate minerals.High concentration of calcium ion and low concentration of bicarbonate radical are thought to be linked to replacement of calcite by dolomite and dissolution of calcite.The formation of CaCl₂ type water is therefore inferred as the result of an adequate water-rock reaction and the participation of deep-sourced fluids.It is preliminarily inferred that the Tertiary in Nanyishan area of the basin may be a potential target for exploration of potassium.

Key words: hydrogen and oxygen isotope, geochemical characteristics, oilfield water, Tertiary, western Qaidam Basin

中图分类号:

TE133

李建森,李廷伟,彭喜明,等. 柴达木盆地西部第三系油田水水文地球化学特征[J]. 石油与天然气地质, 2014, 35(1): 50-55. doi: 10.11743/ogg20140107 Li Jiansen,Li Tingwei,Peng Ximing,et al. Hydrogeochemical behaviors of oilfield water in the Tertiary in western Qaidam Basin[J]. Oil & Gas Geology, 2014, 35(1): 50-55. doi: 10.11743/ogg20140107

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柴达木盆地西部第三系油田水水文地球化学特征

Hydrogeochemical behaviors of oilfield water in the Tertiary in western Qaidam Basin

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