鄂尔多斯盆地伊盟隆起上古生界天然气成因及气源

doi:10.11743/ogg20160208

摘要/Abstract

摘要： 鄂尔多斯盆地伊盟隆起上古生界天然气的成因及来源一直存在争议。通过天然气碳同位素和轻烃综合分析，δ¹³C₂值普遍大于-25.4‰，烷烃气的碳同位素为正碳同位素系列，甲基环己烷指数（MCH）大于50%，具有煤成气的特征。伊盟隆起上古生界烃源岩以煤为主，什股壕地区煤层厚度较大，厚度为6～10 m，镜质体反射率（R_o）为0.8%～1.2%，烃源岩进入了大量生烃阶段，本区烃源岩对天然气近源成藏具有一定的贡献。伊盟隆起天然气甲烷含量平均为94.5%，高于十里加汗地区平均值91.2%；天然气δ¹³C₁值也明显高于十里加汗地区，平均数值相差3‰。由此认为天然气侧向运移过程中发生了成分色层效应和碳同位素分馏作用，伊盟隆起上古生界部分天然气可能来自泊尔江海子断裂以南地区。

关键词: 碳同位素, 轻烃, 气源, 烃源岩, 天然气, 鄂尔多斯盆地

Abstract: No consensus has been reached on the origin and source of natural gas in the Upper Paleozoic of Yimeng Uplift, Ordos Basin.Based on a comprehensive analysis of carbon isotope and light hydrocarbon, the δ¹³C₂ values are gene-rally more than -25.4‰, alkane carbon isotope values change in normal order and the relative content of methylcyclohexane is more than 50%, which show that natural gas is coal-derived gas.The Upper Paleozoic source rocks in Yimeng Uplift are dominated by coals.In Shiguhao area, the thickness of coalbeds ranges from 6 to 10 m.The source rocks with a vitrinite reflectance from 0.8% to 1.2% reached the major stage of hydrocarbon generation.So the local source rocks have an important contribution to near-source gas accumulation.Average methane content of Yimeng Uplift is 94.5%, which is higher than that of Shilijiahan area (91.2%); δ¹³C value was alos significantly heavier than that of Shilijiah area with the difference value of 3‰.It is believed that component differentiation and carbon isotope fractionation occurred in natural gas migration process.So some natural gas in the Upper Paleozoic of Yimeng Uplift may come from the south of Boerjianghaizi fault.

Key words: carbon isotope, light hydrocarbon, gas source, source rock, natural gas, Ordos Basin

中图分类号:

TE122.1

陈敬轶,贾会冲,李永杰,等. 鄂尔多斯盆地伊盟隆起上古生界天然气成因及气源[J]. 石油与天然气地质, 2016, 37(2): 205-209. doi: 10.11743/ogg20160208 Chen Jingyi,Jia Huichong,Li Yongjie,et al. Origin and source of natural gas in the Upper Paleozoic of the Yimeng Uplift,Ordos Basin[J]. Oil & Gas Geology, 2016, 37(2): 205-209. doi: 10.11743/ogg20160208

参考文献

[1] 李良,袁志祥,惠宽洋,等.鄂尔多斯盆地北部上古生界天然气聚集规律[J].石油与天然气地质,2000,21(3):268-271. Li Liang,Yan Zhixiang,Xi Kuanyang,et al.Accumulation regularity of upper Paleozoic gas in north Ordos Basin[J].Oil & Gas Geology,2000,21(3):268-271.
[2] 常兴浩,宋凯.什股壕地区上古生界气藏类型再认识及其意义[J].天然气工业,2013,33(10):25-31. Chang Xinghao,Song Kai.Recognition of Paleozoic gas reservoir types in the Shiguhao region of the northern Ordos Basin and its significance[J].Natural Gas Industry,2013,33(10):25-31.
[3] 薛会,王毅,徐波.鄂尔多斯盆地杭锦旗探区上古生界天然气成藏机理[J].石油实验地质,2009,31(6):551-562. Xue Hui,Wang Yi,Xu Bo.Accumulation mechanism of natural gas in upper Paleozoic,Hangjinqi block,north Ordos Basin[J].Petroleum Geology & Experiment,2009,31(6):551-562.
[4] 韩会平,武春英,季海琨,等.苏里格南部地区上古生界天然气成藏条件及勘探潜力[J].油气地质与采收率,2014,21(4):33-36. Han Huiping, Wu Chunying, Ji Haikun,et al. Reservoir-forming conditions and exploration potential of natural gas in the upper Paleozoic, southern area of Sulige[J].Petroleum Geology and Recovery Efficiency,2014,21(4):33-36.
[5] 孙长青,荣发准,赵克斌.鄂尔多斯盆地杭锦旗地区油气地球化学特征研究[J].天然气地球科学,2010,21(5):715-719. Sun Changqing,Rong Fazhun,Zhao Kebin.Geochemical characteristics of oil and gas in Hangjinqi area,Ordos Basin[J].Natural Gas Geoscience,2010,21(5):715-719.
[6] 李艳霞,赵靖舟,刘新社,等.鄂尔多斯盆地东部上古生界不同含气组合天然气地球化学特征[J].石油实验地质,2012,34(1):71-77. Li Yanxia, Zhao Jinzhou, Liu Xinshe,et al. Geochemical characteristics of natural gas of different gas bearing assemblages in Upper Paleozoic,eastern Ordos Basin[J].Petroleum Geology & Experiment,2012,34(1):71-77.
[7] 王明健,何登发,包洪平,等.鄂尔多斯盆地伊盟隆起上古生界天然气成藏[J].石油勘探与开发,2011,38(1):30-39. Wang Mingjian,He Dengfa,Bao Hongping,et al.Upper palaeozoic gas accumulations of the Yimeng uplift,Ordos Basin[J].Petroleum Exploration and Development,2011,38(1):30-39.
[8] 李潍莲,纪文明,刘震.鄂尔多斯盆地北部泊尔江海子断裂对上古生界天然气成藏的控制[J].现代地质,2015,29(3):584-590. Li Weilian,Ji Wenming,Liu Zhen.Control of Boerjianghaizi fault on gas accumulation of Upper Paleozoic in Northern Ordos Basin[J].Geoscience,2015,29(3):584-590.
[9] 纪文明,李潍莲,刘震,等.鄂尔多斯盆地北部杭锦旗地区上古生界气源岩分析[J].天然气地球科学,2013,24(5):905-913. Ji Wenming,Li Weilian,Liu Zhen,et al.Research on the upper Paleozoic gas source of the Hangjinqi block in the northern Ordos Basin[J].Natural Gas Geoscience,2013,24(5):905-913.
[10] 薛会,张金川,徐波,等.鄂尔多斯北部杭锦旗探区上古生界烃源岩评价[J].成都理工大学学报(自然科学版),2010,37(1):21-28. Xue Hui,Zhang Jinchuan,Xu Bo,et al.Evaluation of Upper Paleozoic source rocks of the Hangjinqi block in the northern Ordos Basin[J].Journal of Chengdu University of Technology(Scienc& Technolongy Edition),2010,37(1):21-28.
[11] 戴金星.各类烷烃气的鉴别[J].中国科学(B辑),1992,(2):185-193. Dai Jinxing.Identification and distinction of various alkanegases[J].Scinece in China(Series B),1992,(2):185-193.
[12] 戴金星,夏新宇,秦胜飞,等.中国有机烷烃气碳同位素系列倒转的成因[J].石油与天然气地质,2003,24(1):1-6. Dai Jinxing,Xia Xinyu,Qin Shengfei,et al.Causation of partly reversed Ordos of δ¹³C in biogenic alkane gas in China[J].Oil & Gas Geology,2003,24(1):1-6.
[13] Thompson K F M.Classification and thermal history of petroleum based on light hydrocarbons[J].Geochemical et Cosmochimica Acta,1983,47(2):303-316.
[14] 胡惕麟,戈葆雄,张义纲,等.源岩吸附烃和天然气轻烃指纹参数的开发和应用[J].石油实验地质,1990,12(4):375-393. Hu Tilin,Ge Baoxiong,Zhang Yigang,et al.The development and application of fingerprint parameters for hydrocarbons absorbed by source rocks and light hydrocarbon in natural gas[J].Experimental Petroleum Geology,1990,12(4):375-393.
[15] 胡国艺,李剑,李谨,等.判识天然气成因的轻烃指标探讨[J].中国科学(D辑),2007,37(增刊Ⅱ):111-117. Hu Guoyi,Li Jian,Li Jin,et al.Study on the origin identification of natural gas by the parameters of light hydrocarbon[J].Science in China(Series D),2007,37(SupplementⅡ):111-117.
[16] 胡国艺,李谨,李志生,等.煤成气轻烃组分和碳同位素分布特征与天然气勘探[J].石油学报,2010,31(1):42-47. Hu Guoyi,Li Jin,Li Zhisheng,et al.Composition and carbon isotopic distribution characteristics of light hydrocarbon in coal-derived gas and natural gas exploration[J].Acta Petrolei Sinica,2010,31(1):42-47.
[17] 陈践发,苗忠英,张晨,等.塔里木盆地塔北隆起天然气轻烃地球化学特征及应用[J].石油与天然气地质,2010,31(3):271-276. Chen Jianfa,Miao Zhongying,Zhang Zhen,et al.Geochemical characteristics of light hydrocarbons in natural gas in the Tabei Uplift of the Tarim Basin and their implications[J].Oil & Gas Geology,2010,31(3):271-276.
[18] Mango F D.The origin of light cycloalkanes in petroleum[J].Geochem Cosmochim Acta,1990,54:23-27.
[19] 史基安,卢龙飞,王金鹏,等.天然气运移物理模拟实验及其结果[J].天然气工业,2004,24(12):32-34. Shi Jian,Lu Longfei,Wang Jinpeng,et al.Physical modeling tests and results of natural gas migration[J].Natural Gas Industry,2004,24(12):32-34.
[20] 石鸿翠,江晨曦,孙美静,等.鄂尔多斯盆地南部上古生界泥岩盖层封闭性能评价[J].油气地质与采收率,2015,22(2):9-16. Shi Hongcui,Jiang Chenxi,Sun Meijing,et al. Sealing capability assessment of mudstone caprock in the Upper Paleozoic,south Ordos Basin[J].Petroleum Geology and Recovery Efficiency,2015,22(2):9-16.
[21] 郭少斌,赵可英.鄂尔多斯盆地上古生界泥页岩储层含气性影响因素及储层评价[J].石油实验地质,2014,36(6):678-683. Guo Shaobin, Zhao Keying.Gas-bearing influential factors and estimation of shale reservoirs in Upper Paleozoic,Ordos Basin[J].Petroleum Geology & Experiment,2014,36(6):678-683.
[22] 林会喜,程付启,金强.天然气组分、同位素分馏机理及实例分析[J].天然气地球科学,2011,22(2):195-200. Lin Huixi,Cheng Fuqi,Jin Qiang.Fractionation mechanism of natural gas components and isotopic compositions and sample analysis[J].Natural Gas Geoscience,2011,22(2):195-200.
[23] Prinzhofer A,Mello M R,Takaki T.Geochemical characterization of natural gas:A physical multivariable approach and its applications in maturity and migration estimates[J].AAPG Bulletin,2000,84(8):1152-1172.
[24] 任战利,张盛,高胜利,等.伊盟隆起东胜地区热演化史与多种能源矿产的关系[J].石油与天然气地质,2006,27(2):187-193. Ren Zhanli,Zhang Sheng,Gao Shengli,et al.Relationship between thermal history and various energy mineral deposits in Dongsheng area,Yimeng uplift[J].Oil & Gas Geology,2006,27(2):187-193.
[25] 王飞龙.鄂尔多斯盆地杭锦旗地区上古生界古水动力体系与油气运移成藏[D].西安:西北大学,2007. Wang Feilong.Study on the palaeodrodynamic system and hydrocarbon migration and accumulation of Upper Paleozoic in the region of Hangjinqi in Ordos Basin[D].Xian:Northwest university,2007.
[26] 史基安,卢龙飞,王金鹏,等.天然气运移物理模拟实验及其结果[J].天然气工业,2004,24(12):32-34. Shi Jian,Lu Longfei,Wang Jinpeng,et al.Physical modeling tests and results of natural gas migration[J].Natural Gas Industry,2004,24(12):32-34
[27] Prinzhofer A A,Pernaton E.Isotopically light methane in natural gas:Bacterial imprint or diffusive fractionation[J].Chemical Geology,1997,142:193-200.
[28] 李剑,刘朝露,李志生,等.天然气组分及其碳同位素扩散分馏作用模拟实验研究[J].天然气地球科学,2003,14(6):463-468. Li Jian,Liu Chaolu,Li Zhisheng,et al.Experiment investigation on the carbon isotope and composition fractionation of methane during gas migration by diffusion[J].Natural Gas Geoscience,2003,14(6):463-468.
[29] 刘友民.陕甘宁盆地北缘乌兰格尔地区白垩系油苗成因及意义[J].石油勘探与开发,1982,(3):39-42. Liu Youmin.Some notes about the oil seepage in Wulanger area,northern Shanganning Basin[J].Petroleum Exploration and Development,1982,(3):39-42.