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| 氩同位素用于库车坳陷天然气主力气源岩判识 | |
| 引用本文： | 张殿伟,刘文汇,郑建京,王晓锋,南青云.氩同位素用于库车坳陷天然气主力气源岩判识[J].地球化学,2005,34(4):101-105. |
| 作者姓名： | 张殿伟 刘文汇 郑建京 王晓锋 南青云 |
| 作者单位： | 1. 中国科学院,兰州地质研究所,气体地球化学重点实验室,甘肃,兰州,730000;中国科学院,研究生院,北京,100039 2. 中国石油化工股份有限公司,石油勘探开发研究院,北京,100083 3. 中国科学院,兰州地质研究所,气体地球化学重点实验室,甘肃,兰州,730000 |
| 基金项目： | 国家重点基础研究发展计划(973计划) |
| 摘 要： | 稀有气体是天然气中指示其地球化学特征的重要组分,放射成因氩( Arr)的年代积累效应广泛应用于同位素定年和天然气的气源对比.本文系统地讨论了 40Ar的形成机理及其运移进入气藏的过程,利用 40Ar的母体元素 K在煤和煤系泥岩中的丰度差异,分析了以煤和煤系泥岩为母源的天然气 40Ar/36Ar同位素组成上的不同,并利用这种差异对煤系中煤岩或煤系泥岩为源岩的天然气藏的主力源岩进行了判识,继而建立了利用氩同位素组成判识煤系烃源岩主力源岩的方法.利用此方法对塔里木盆地库车坳陷三叠系-侏罗系煤与煤系泥岩互层的烃源岩进行了探讨, 数学计算结果表明该区主力源岩为煤系泥岩, 煤对天然气藏的贡献较小. |
| 关 键 词： | 氩同位素组成 气源对比 煤 碳质泥岩 库车坳陷 塔里木盆地 |
| 文章编号： | 0379-1726(2005)04-0405-05 |
| 修稿时间： | 2004年12月3日 |
Identification of main gas source in Kuqa depression using argon isotope ratios |
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| Zhang Dian-wei,LIU Wen-hui,ZHENG Jian-jing,WANG Xiao-feng,NAN Qing-yun.Identification of main gas source in Kuqa depression using argon isotope ratios[J].Geochimica,2005,34(4):101-105. | |
| Authors: | Zhang Dian-wei LIU Wen-hui ZHENG Jian-jing WANG Xiao-feng NAN Qing-yun |
| Abstract: | Rare gas is an important constituent for indicating natural gas geochemical characteristics. Radiogenic argon (40Arr) is widely applied to isotope chronology and gas and source rock correlation. K, the parent element of 40Arr, has different abundance in coal and argillite, which can be used in analyzing the difference between 40Ar/36Ar values of natural gases produced from coal and argillite, and identifying the main gas source in coal source rocks. In this paper, the forming mechanism of 40Arr and its process of entering into gas pool are discussed, on the basis of which a method for identification of main gas source is developed. Using this method the interbedding source rocks of Triassic-Jurassic coal and argillite are studied in the Kuqa depression, Tarim Basin. The results of calculation indicate that the main gas source is the argillite in Triassic-Jurassic coal measures and coal makes a little contribution to natural gas reservoir. |
| Keywords: | argon isotopic composition gas and source rock correlation coal carbargilite Kuqa depression Tarim Basin |
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