准噶尔盆地东部地区天然气地化特征与成因来源
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摘要
准噶尔盆地天然气资源丰富,但勘探程度很低.阜26井石炭系气藏的发现揭示了盆地东部地区天然气勘探的广阔前景.本文系统分析了准噶尔盆地东部21个天然气样品的组分、稳定碳同位素和轻烃化合物的地球化学特征,并与克拉美丽气田石炭系来源天然气及吐哈盆地侏罗系来源天然气开展了对比研究,认为石炭系煤系烃源岩生成的天然气构成了准噶尔盆地东部地区天然气的主体;中、下侏罗统煤系烃源岩生成的天然气构成了准噶尔盆地东部地区天然气的重要组成部分.研究结果表明,准噶尔盆地东部地区天然气的成因来源复杂,主要存在两类天然气:一类是石炭系煤系烃源岩生成的高熟煤成气,主要分布在北三台凸起,估算的成熟度为0.96%Ro～1.43%Ro,此类天然气构成了研究区天然气的主体;另一类是来自于中、下侏罗统的低熟煤成气,主要分布在阜康凹陷东部斜坡带,估算的成熟度平均仅为0.76%Ro.此外,北404井天然气为来自二叠系的油型气;西泉011井天然气遭受了生物降解作用的改造;阜10井天然气则表现出石炭系和二叠系来源天然气混源的特征.
Although the Junggar basin is abundant in natural gas resources,only a few gas reserves have been proven in the basin.The discovery of Carboniferous gas reservoir in Well Fu26 has shed light on the gas exploration in the eastern Junggar basin.In this study,the molecular compositions,stable carbon isotopes as well as low molecular weight hydrocarbons of 21 gas samples were discussed.In addition,a comparative study with gases from the Kelameili gas field and Turpan-Hami basin was also performed.Results show that natural gases in the study area have complex genetic types and origins and can be generally divided into two groups:one group is coal-derived gas generated from the high mature Carboniferous coal measures and manly distributes in the Beisantai uplift,with the equivalent vitrinite of natural gas varying from 0.96%to 1.43%;the other group is coal-derived gas generated from the low mature Jurassic coal measures and manly distributes in the eastern slope of Fukang depression,with the average equivalent vitrinite of only 0.76%.Besides,gas in the Well Bei404 is oil-type gas derived from the Permian source rocks while that in the Well Xiquan011 is impacted by biodegradation.Gases from Well Fu10 is an admixture of Permian-and Carboniferous-related natural gas.
Although the Junggar basin is abundant in natural gas resources,only a few gas reserves have been proven in the basin.The discovery of Carboniferous gas reservoir in Well Fu26 has shed light on the gas exploration in the eastern Junggar basin.In this study,the molecular compositions,stable carbon isotopes as well as low molecular weight hydrocarbons of 21 gas samples were discussed.In addition,a comparative study with gases from the Kelameili gas field and Turpan-Hami basin was also performed.Results show that natural gases in the study area have complex genetic types and origins and can be generally divided into two groups:one group is coal-derived gas generated from the high mature Carboniferous coal measures and manly distributes in the Beisantai uplift,with the equivalent vitrinite of natural gas varying from 0.96%to 1.43%;the other group is coal-derived gas generated from the low mature Jurassic coal measures and manly distributes in the eastern slope of Fukang depression,with the average equivalent vitrinite of only 0.76%.Besides,gas in the Well Bei404 is oil-type gas derived from the Permian source rocks while that in the Well Xiquan011 is impacted by biodegradation.Gases from Well Fu10 is an admixture of Permian-and Carboniferous-related natural gas.
引文
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[12]吴小奇,黄士鹏,廖凤蓉,等.准噶尔盆地南缘天然气地球化学特征及来源[J].天然气地球科学,2011,22(2):224-232.WU Xiaoqi,HUANG Shipeng,LIAO Fengrong,et al.Geochemical characteristics and sources of natural gas from the south margin of Junggar basin[J].Natural Gas Geoscience,2011,22(2):224-232.
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[30]刚文哲,高岗,郝石生,等.论乙烷碳同位素在天然气成因类型研究中的应用[J].石油实验地质,1997,19(2):164-167.GANG Wenzhe,GAO Gang,HAO Shisheng,et al.Carbon isotope of ethane applied in the analyses of genetic types of natural gas[J].Petroleum Geology and Experiment,1997,19(2):164-167.
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