摘要
四川威远气田是我国储层最老的气田,有关该气田气源的争论从未停止,有主张无机成因的、有主张有机成因的。其中后者又有3种不同观点:①来自震旦系灯影组白云岩;②来自寒武系九老洞组泥页岩;③既来自灯影组又来自九老洞组。主张有机成因者的判断依据如下:①花岗岩裂隙气与灯影组天然气的碳同位素组成;②花岗岩矿物包裹体中气相组分与灯影组天然气组分的比较;③灯影组天然气中的氦含量及3He/4Ne比值;④灯影组天然气中的40Ar/36Ar比值等。文章分析认为,威远气田灯影组天然气的来源应是地壳深部,可能一部分与花岗岩有关,另一部分与上地幔有关。
The Weiyuan gas field in Sichuan is the field with the oldest reservoir (Dengying Formation, Sinian) in China. The controversies over differing opinions about the origin of natural gas in the field have been always carrying out up to now, some advocating the viewpoint of abiogcnctic gas and some maintaining that of organic genetic gas. There are three opinions about the origin of natural gas there:① coming from the dolostones of dengying Formation, Sinian; ②coming from the mudstoncs and shales of Jiulaodong Formation, Cambrian; and ③coming from both Dengying Formation and Jiulaodong Formation. In light of these data on: ①the carbon isotopic composition of gases in granite and Dengying Formation; ②the gas components of mineral inclusions in granite and of Dengying Formation;③the He content and 3 He/4 He ratio of natural gas in Dengying Formation; and ④the 40 Ar/36 Ar ratio of natural gas in Dengying Formation, it was considered that the natural gas in Dengying Formation of Weiyuan field had originated from the deep-seated crust, being partly related to the granite and parlly related to the upper mentle.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第7期4-7,共4页
Natural Gas Industry
