摘要
在分析准噶尔盆地克拉美丽地区石炭系2套烃源岩地球化学特征基础上,结合天然气组成及其伴生凝析油单体烃碳同位素特征,探讨了克拉美丽地区石炭系天然气来源问题。准噶尔盆地克拉美丽地区石炭系天然气主要为湿气,其中克拉美丽气田天然气为高成熟的腐殖型气,五彩湾气田天然气主要为成熟—高成熟的腐殖型气。根据烃源岩生烃潜力评价和热模拟实验分析,研究区石炭系松喀尔苏组下段与滴水泉组烃源岩以Ⅲ型腐殖型为主,少量Ⅱ型有机质,成熟度达到成熟—高成熟阶段,具备较好的生气潜力。在高温(440~560℃)热解阶段,2套石炭系烃源岩生成的天然气碳同位素值与克拉美丽地区天然气的碳同位素值较为一致,在600℃温度时,烃源岩总产气率大于150 kg/tTOC,具有较强的生气能力。正构烷烃碳同位素组成特征显示克拉美丽地区石炭系气藏天然气及伴生凝析油主要为滴水泉组烃源岩及松喀尔苏组下段烃源岩混源。
Based on analysis of geochemical characteristics of two sets of Carboniferous source rocks,and combined with the composition of natural gas and the carbon isotopic composition distribution of n-alkanes in condensate oil,the source of Carboniferous natural gas in Kalameili area of Junggar Basin is discussed.Carboniferous natural gases in Kelameili area are mainly wet gas.Among them,natural gas in Kalameili Gas Field is highly mature humic gas,and natural gas in Wucaiwan Gas Field is mature to highly mature humic gas.Based on evaluation of hydrocarbon generation potential of source rock and thermal simulation experiment,source rocks of the lower Songkaersu Formation and the Dishuiquan Formation in the study area are mainly type III kerogen,with a small amount of type II kerogen,and its maturity reaches mature to high mature stage with good potential of gas generation.At 600℃,the total gas production rate of source rocks is greater than 150 kg/tTOC.During the stage of high pyrolysis temperature(from 440℃to 560℃),the carbon isotope values of natural gas generated by two sets of Carboniferous source rocks are consistent with natural gas in Kelameili area.And the carbon isotopic composition distribution of n-alkanes shows that the condensate oil associated with the Carboniferous gas reservoirs in Kelameili area is mainly from source rocks of the lower Songkaersu Formation and the Dishuiquan Formation.
作者
李二庭
靳军
王剑
罗正江
马万云
米巨磊
何丹
王明
LI Er-ting;JIN Jun;WANG Jian;LUO Zheng-jiang;MA Wan-yun;MI Ju-lei;HE Dan;WANG Ming(Xinjiang Laboratory of Petroleum Reserve in Conglomerate,Karamay 834000,China;Research lnustitute of Erperiment und Tesing.Xinjiang Oilfield Company,Perro China.Karamay 834000,China)
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2020年第11期1515-1523,共9页
Natural Gas Geoscience
基金
新疆维吾尔自治区重点实验室开放课题(编号:2017D04023)资助。
