收稿日期: 2010-03-29
修回日期: 2010-05-25
网络出版日期: 2011-02-10
基金资助
国家重点研究发展规划(“973”) 项目“中国西部典型叠合盆地复合优势通道形成演化与油气运移效率”(编号:2006CB202305); CNPC中青年创新基金项目“新疆地区古生界油气藏成藏机制研究”(编号:04E7046)联合资助.
Characteristics of Natural Gas Sources and Accumulation in Dibei Uplift of Junggar Basin
Received date: 2010-03-29
Revised date: 2010-05-25
Online published: 2011-02-10
在准噶尔盆地腹部滴水泉凹陷南侧的滴南凸起上发现的大型气田,气藏层位多,储层主要为石炭系火山岩。滴北凸起南面紧邻滴水泉凹陷,北靠乌伦古坳陷,是南、北2个凹陷生成油气运移的有利富集区,但目前勘探尚未获得重大突破,仅在侏罗系和石炭系发现小型气藏。滴北地区天然气来自哪个凹陷目前尚不清楚。文章通过天然气碳同位素与气层抽提物的对比,指出滴北凸起天然气乙烷碳同位素比滴南凸起天然气重,与盆地东部地区典型石炭系来源的天然气相似,气层抽提物地球化学特征与北面乌伦古坳陷石炭系源岩一致,因此应来自北面的乌伦古坳陷。根据储层流体包裹体特征,指出气藏成藏时间在晚白垩世以后。
陈世加, 陈雪, 路俊刚, 陆林超, 杨国平, 王熠 . 准噶尔盆地滴北凸起天然气来源及成藏特征[J]. 天然气地球科学, 2011 , 22(1) : 97 -101 . DOI: 10.11764/j.issn.1672-1926.2011.01.97
The large-scale gasfield, containing many gas reservoir layers mainly composed of Carboniferous volcanic rocks, is discovered in the Dinan uplift-the south of Dishuiquan depression in central Junggar basin. Dibei uplift, near the Dishuiquan depression in south and Wulungu depression in north, is considered as the favorable region of hydrocarbon accumulaion from two depressions. Recently, small-scale gas reservoirs have been found in Jurassic and Carboniferous strata, but no greater breakthrough has been made. It is still unclear about the origin of the natural gas of the Dibei uplift. By comparing with carbon isotope of natural gas and reservoir extraction of gas intervals, it is showed that the geochemical characteristics of natural gas in Dibei and Dinan uplift has significant differences, and natural gas of Dibei uplift is similar with that from typical Carboniferous sources in the eastern part of the basin. Consequently, the natural gas should be sourced from Wulungu depression whose geochemical characteristics of rocks in Carboniferous are similar with Dibei uplift. Based on the characteristics of fluid inclusions, it is concluded that the gas is accumulated at late stage of late Cretaceous.
[1]Huang Difan,Li Jinchao.The Principle of Evolution and Hydrocarbon Formation of Nonmarine Organic Matter[M].Beijing:Petroleum Industry Press,1984:10-42.[黄第藩,李晋超.陆相有机质演化和成烃机理[M].北京: 石油工业出版社,1984:10-42.]
[2]Xu Yongchang.The Formation Theory and Application of Natural Gas[M].Beijing:Science Press,1994:84-102.[徐永昌.天然气成因理论及应用[M].北京: 科学出版社,1994: 84-102.]
[3]Cramer B,Krooss B M,Littke R.Modelling isotope fractionation during primary cracking of natural gas: A reaction kinnetic approach[J].Chemical Geology,1998,149:235-250.
[4]Wang Xianbin,Tuo Jincai,Li Zhenxi,et al.Exploration on [HJ]formation theory of natural gas:Broaden the field for discoverying new resource[J].Natural Gas Geoscience,2003,14(1):30-34.[王先彬,妥进才,李振西,等.天然气成因理论探索——拓宽领域,寻找新资源[J].天然气地球科学,2003,14(1):30-34.]
[5]Chen Shijia,Fu Xiaowen.The exploration theory on the stage of natural gas and application in the research of gas accumulation[J].Journal of Southwest Petroleum University,2001,23(5):4-7.[陈世加,付晓文.天然气分段捕获原理及在成藏研究中的应用[J].西南石油大学学报,2001,23(5):4-7.]
[6]Kroos B M,Littke R,Muller B,et al.Generetion of nitrogen and methane from sedimentary organic matter: Implications on the dynamics of natural gas accumulations[J].Chemical Geology,1995,126: 291-318.
[7]Chen Shijia,Fu Xiaowen,Shen Zhaoguo,et al.Molecular nitrogen genesis in natural gases and relationship with gas accumulation history in Tarim basin[J].Acta Sedimentologica Sinica,2000,18(4):616-618.[陈世加,付晓文,沈昭国,等.塔里木盆地中高氮天然气成因以及与油气聚集的关系[J].沉积学报,2000,18(4):616-618.]
[8]Zhen Jianjing,Wen Deshun,Meng Qianxiang,et al.Geochemical parametric characteristics of source rocks in thermal simulation of evolution:Example from the Jurassic source rocks of Junggar basin[J].Natural Gas Geoscience,2003,14(2):134-139.[郑建京,温德顺,孟仟祥,等.煤系烃源岩热模拟演化过程的地球化学参数特征——以准噶尔盆地侏罗系煤系烃源岩为例[J].天然气地球科学,2003,14(2):134-139.]
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