K-Ar关系在天然气气源对比研究中的应用  

DISCUSSION ABOUT THE RELATIONSHIP BETWEEN KALIUM AND ARGON IN RESEARCH OF GAS AND SOURCE ROCK CORRELATION OF NATURAL GAS

作　　者：郑建京[1] 胡慧芳[1] 刘文汇[1] 张殿伟[1] 王晓峰[1] 孙国强[1] 

机构地区：[1]中国科学院地质与地球物理研究所气体地球化学重点实验室,甘肃兰州730000

出　　处：《天然气地球科学》2005年第4期499-502,共4页Natural Gas Geoscience

基　　金：国家重点基础发展规划项目(编号:2001CB209102)资助.

摘　　要：指出天然气藏中的氩同位素年代积累效应是建立在源岩中放射性钾随时间的放射性衰变产生40Ar的基础上;对以壳源为主的天然气而言,其40Ar主要来源于40K的K-壳层捕获。随源岩时代变老,源岩中放射性40Ar增大,40Ar/36Ar值增大。利用天然气中稀有气体氩同位素特征与不同类型源岩中母体K的关系对塔里木盆地和鄂尔多斯盆地进行研究,在对不同类型烃源岩中K2O的含量进行了尽可能的收集和整理发现,就碎屑岩、煤岩和碳酸盐岩三大类烃源岩而言,K含量的变化主要取决于源岩中粘土矿物含量的多少,其K2O在岩石中赋存量差异近10量级。认为K-Ar关系的研究在对发育多类型天然气源岩类型的含油气盆地进行气源对比研究中极有价值。Based on the radioactivity of Kalium which generates ^40Ar in source rock through radioactiv edecay with geologic time passing by, the age accumulation effect of Argon isotope in natural gas pool is founded. For the natural gas from the crust, ^40Ar mainly derives from Kalium-Crust trapping of ^40K. As the age of sourcerock becomes old, the content of the radioactive 40 Ar increases, the ^40Ar/^36Ar ratio also increases. The article carries out researches on the two basins——Tarim basin and Ordos basin by using the relationship between Argon isotope in! natural gas and the generatrix Kalium in different types of source rocks. After the collection and collation of K2O content as much as possible in different types of source rocks, for the three types of source rocks——clastic rocks, ingredient rocks and carbonate rocks, it can be discovered that the change of Kalium content mainly rests upon the content of the clay minerals in source rocks. The difference of K2O content in rocks is about the magnitude of 10. Research on the relationship between Kalium and Argon is very valuable to the gas and source rock correlation in petroliferous basins which have different types of source rocks.

关 键 词：稀有气体 源岩K含量 AR同位素 气源对比 

分 类 号：TE122.113[石油与天然气工程—油气勘探]