DISCUSSION ON GAS POOLS OF MIXED ORIGINS AND THE CONTROLLING FACTORS
-
摘要: 天然气具有分子小、重量轻、粘度低和被岩石吸附能力小、运移速度快、扩散能力强、运移途径长等特征,所以聚集在一个气藏或气苗中诸气体组分,除具同一成因外,也有混合成因的.以往仅根据其主要组分的成因,把整个天然气藏统归同一成因,而忽视了不同成因的混合气藏(苗)的研究.近几年来,由于重视了天然气组分的同位素测试,我国有很多气藏(苗)是具有不同成因混合气藏的特征的.Abstract: Based on the analyses of various isotopic compositions (δ13C1,δ13Cco2,40Ar/38Ar,etc.),it is suggested there arc not only natural gases of single origin,but also gases of mixed origins.According to the isotopic composition studies of He,Ar and C,the constituents of He,Ar and N2 in Sinian weiyun Gas Field are pertained to inorganic origin coming from deep parts of the crust,whereas it can attributed to thermogenic gas because the isotopic values of the hydrocarbons are of -32.6‰— -32.9‰.As another example,the gas of Wanjints Gas Field has values of δ13Cco2 range from -4.04‰ to -8.83‰ which proves the inorganic origin of the CO2 (volcanic source) whereas δ13C1 value is of -42.07‰ to -45.37‰ which indicates the organic origin of the methane.The various origins of the different constituents of the same gas pool (shows) indicate not only the complex processes for the accumulation and formation of natural gas,but also the complication of the gas and source correlations.
-
[1] 朱家蔚等,东渡凹陷煤成气地化指标及其与油成气的对比,石油与天然气地质,第6卷第3期,1985年. [2] 徐永昌等,中原、华北油气区《煤型气》地化特征初探,沉积学报,第3卷第2期,1985年. [3] 王先彬,地球深部来源的天然气,科学通报,第27卷第17期,1982年. [4] G,福尔同位素地质学原理,科学出版社,1983年. [5] 戴金星等鉴别煤成气和油型气若干指标的初步探讨,石油学报,第6卷第2期,1985年. [6] 裘松余等松辽盆地南部万金塔二氧化碳气田的地质特征及其成因,石油与天然气地质,第6卷第4期1985年. [7] 戚厚发等,我国高含二氧化碳气藏的分布及其成因探讨,石油勘探与开发,第2期,1981年.
点击查看大图
计量
- 文章访问数: 455
- HTML全文浏览量: 38
- PDF下载量: 320
- 被引次数: 0