摘要
本文主要讨论和田河气田天然气的地球化学特征和来源以及非烃气体的可能成因。和田河气田天然气以烃类气体为主,但含有较高的非烃气体,含量一般为10％～25％。乙烷碳同位素值为-37.8‰～-34.9‰,说明形成该天然气的母质属于腐泥型。烃类组分、非烃组分分布以及天然气δ^(13)C_1值在和田河气田的东、西部存在明显的差异。和田河气田天然气源自寒武系烃源岩,但表现为具有原油二次裂解气的特殊来源特征。东部的玛4井区天然气以原油裂解气为主,西部的玛3、玛8井区则为干酪根裂解气与原油裂解气的混合气。初步分析N_2、CO_2和H_2S的成因,认为和田河气田天然气的特殊来源是天然气中非烃气体高含量的重要原因。
The geochemical features and source of the natural gases in the Hotan River gas field and the origin of its non-hydrocarbon gases are discussed. The gases are mainly composed of hydrocarbon components, with higher non-hydrocarbon components from 10% to 25%. The gas belongs to the sapropel type, showing lower ethane carbon isotopic ratios from - 37. 8%o to -34. 9%. The content of hydrocarbon and non-hydrocarbon gases and δ13C1 values in the eastern part of the field are obviously different from those in the western part. The Hotan gases, derived from Cambrian source rock, had a special source from the cracking of oil. It is considered that the gases in the eastern part of the field are mainly from the cracking of oil and the gases in the western part of the field are mixed gases from the cracking of oil and kerogen. The origin of N2 , CO2 and H2S is chiefly related to the special gas source from the cracking of oil.
出处
《地质论评》
CAS
CSCD
北大核心
2002年第5期480-486,共7页
Geological Review
基金
"九五"科技攻关专题(编号 99-111-01-03-04)的成果
