学术
摘 要:
准噶尔盆地乌夏地区天然气主要含烃类气体,以甲烷为主,干燥系数平均为0.8801,多为湿气,V（iC4）/V（nC4）平均为0.88,V（iC5）/V（nC5）平均为0.99,热演化程度较高。非烃气体中氮气含量较高,其次为二氧化碳,氧气含量最少,不含硫化氢。随着深度增加,天然气相对密度、干燥系数、甲烷含量、重烃气含量和非烃气体含量可按规律分为7个变化带。天然气具有δ13C1〈δ13C2〈δ13C3〈δ13C4的正碳同位素系列特征,烷烃气是原生型有机成因气。天然气源岩Ro为0.21%～1.66%,烃源岩主要在低成熟和成熟阶段生气,根据δ13C1与δ13C2-δ13C1关系以及有机成因气δ13C1与V（C1）/V（C2＋3）关系,判断天然气的成因类型主要为石油伴生气,乌32井区可能存在凝析油伴生气。[著者文摘]
文章出处:
《新疆石油地质》-2007年28卷4期 -413-415页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1001-3873（2007）04-0413-03
Geochemical Feature of Natural Gas in Wu-Xia Area, Junggar Basin
LI Xiu-peng, ZHA Ming, WU Kong-you （Faculty of Geo-Resources and Information, China University of Petroleum, Dongying, Shandong 257061, China）
Abstract:
The natural gas in Wu-Xia area is dominated by methane wet gas of high maturity with dry coefficient of 0.8801, V（iC4）/V（nC4） of 0.88, V（iC5）/V（nC5） of 0.99 in average. Its non-hydrocarbon gas contains high content of N2, less CO2, micro-O2 and free H2S. With increase of the depth, the relative density, dry coefficient, methane content, heavy hydrocarbon gas content and non-hydrocarbon gas content have 7 changing trends by regularity. The natural gas is characterized by δ^13C1〈δ13^C2〈δ13^C3〈δ13^C4 and the alkane gas is original organic genetic gas. The source rocks produce gases in low-matured and matured stages with Ro from 0.21% to 1.66%. According to the relationship between δ13^Ci and δ13^C2-δ13^C1 as well as δ13^C1 vs. V（C1）/V（C2,3）, it is judged that the origin of natural gas belongs to associated gas of crude oil, and a small amount of associated gas of condensate oil may occur in Wu-32 Wellblock.[著者文摘]
Key words:
Junggar basin; Wuerhe-Xiazijie area; natural gas; geochemistry; genetic type
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