准噶尔盆地南缘异常天然气地球化学特征及其成因
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摘要
利用天然气成因判别Whiticar图版研究准噶尔盆地南缘独87井、南安1井和齐34井天然气成因类型,结论与乙烷和丙烷碳同位素判识结果相矛盾。在分析研究区南安1井八道湾组、齐34井中、下侏罗统和独87井中新统储层天然气组分和碳同位素组成特征的基础上,对异常天然气成因进行分析。南安1井甲烷含量为84.58%,齐34井甲烷含量为97.38%,两者均为干气;独87井甲烷含量仅为77.09%,为湿气。独87井碳同位素变化比较复杂,出现δ13C1>δ13C2,δ13C2<δ13C3且δ13C3>δ13C4局部碳同位素倒转现象;齐34井天然气为δ13C2>δ13C3>δ13C4的局部碳同位素倒转;南安1井没有出现碳同位素倒转,为正碳同位素特征。南安1井和齐34井天然气因受到细菌降解作用,其组分含量和碳同位素发生变化;独87井天然气δ13C1变重是上覆盖层封盖能力较差、甲烷发生漏失所致。据此对Whiticar图版进行了必要的补充修正,可以对细菌降解和甲烷漏失次生作用进行有效识别,避免对天然气母质类型认识上的误差。
Based on study of the component and its carbon isotope of natural gas samples from the J1b reservoir of Nanan-1 well,the J2-1reservoir of Qi-34 well and the N1reservoir of Du-87 well in the south margin of Junggar basin,we suggest that these natural gases arecoal-related gas herein.But the natural gases sample data from the J1b reservoir of Nanan-1 well and the J2-1reservoir of Qi-34 wellare distributed at the region where natural gas originated from Type Ⅱ kerogen often locates in the Whiticar chart board.Natural gascarbon isotope and natural gas components show that,the secondary action should alter C1/C2+3and δ13C1.In view of the geological back-ground of south margin of Junggar basin,the genesis of unconventional natural gas from Nanan-1 well and Qi-34 well and Nanan 1well is bacterial degradation,which resulted in C1/C2+3increase and δ13C1lightening,but the genesis of unconventional natural gas fromDu-87 well is methane leakage effect.According to the distribution region of the unconventional natural gas,the different developmentdirection of bacteria degradation gas and the coal-related gas leakage in methane component are pointed out.The research conclusionis a necessary supplement to the Whiticar chart board,and makes the Whiticar chart board more practical in the research work aboutnatural gas.
Based on study of the component and its carbon isotope of natural gas samples from the J1b reservoir of Nanan-1 well,the J2-1reservoir of Qi-34 well and the N1reservoir of Du-87 well in the south margin of Junggar basin,we suggest that these natural gases arecoal-related gas herein.But the natural gases sample data from the J1b reservoir of Nanan-1 well and the J2-1reservoir of Qi-34 wellare distributed at the region where natural gas originated from Type Ⅱ kerogen often locates in the Whiticar chart board.Natural gascarbon isotope and natural gas components show that,the secondary action should alter C1/C2+3and δ13C1.In view of the geological back-ground of south margin of Junggar basin,the genesis of unconventional natural gas from Nanan-1 well and Qi-34 well and Nanan 1well is bacterial degradation,which resulted in C1/C2+3increase and δ13C1lightening,but the genesis of unconventional natural gas fromDu-87 well is methane leakage effect.According to the distribution region of the unconventional natural gas,the different developmentdirection of bacteria degradation gas and the coal-related gas leakage in methane component are pointed out.The research conclusionis a necessary supplement to the Whiticar chart board,and makes the Whiticar chart board more practical in the research work aboutnatural gas.
引文
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[15]戴金星,倪云燕,李剑,等.塔里木盆地和准噶尔盆地烷烃气碳同位素类型及其意义[J].新疆石油地质,2008,29(4):403-410.
[16]田辉,王招明,肖中尧,等.原油裂解成气动力学模拟及其意义[J].科学通报,2006,51(15):1 821-1 827.
[17]王政军,朱光有,王政国,等.原油降解气的形成条件及其特征[J].天然气工业,2008,28(11):29-33.
[18]王苗,廖远涛,邓大飞,等.南堡凹陷1号构造带东一段储层物性特征及其控制因素[J].油气地质与采收率,2012,19(4):14-17.
[19]朱光有,张水昌,赵文智,等.中国稠油区浅层天然气地球化学特征与成因机制[J].中国科学:D辑地球科学,2007,37(S2):80-89.
[20]齐雪峰,吴晓智.准噶尔盆地南缘安集海河组沉积环境及油气地质意义[J].新疆石油地质,2009,30(3):289-292.
[21]宋元林,胡新平.呼图壁气田紫泥泉子储层特征及综合评价[J].西安石油学院学报:自然科学版,2001,16(4):15-19.
[22]秦胜飞.塔里木盆地库车坳陷异常天然气的成因[J].勘探家,1999,4(3):21-23.
[23]Chung H M,Gormly J R,Squires R M.Origin of gaseous hydrocarbons in subsurface environments:Theoretical considerations of carbon isotope distribution[J].Chemical Geology,1988,71(1/3):97-104.
[2]宋占东,姜振学,宋岩,等.准噶尔盆地南缘天然气中N2地球化学特征及成因分析[J].天然气地球科学,2012,23(3):541-549.
[3]Whiticar M J.Carbon and hydrogen isotope systematics of bacterial formation and oxidation of methane[J].Chemical Geology,1999,161(1/3):291-314.
[4]李涛,隋风贵,张奎华.准噶尔盆地南缘油气成藏组合特征及分布规律[J].油气地质与采收率,2006,13(1):55-58.
[5]魏东涛,贾东,赵应成,等.准噶尔盆地南缘原油地球化学特征[J].石油与天然气地质,2007,28(3):433-440.
[6]李吉君,卢双舫,薛海涛,等.准噶尔盆地南缘中下侏罗统煤系烃源岩生气史[J].新疆石油地质,2010,31(4):369-371.
[7]Yanrong Z,Yulan C,Chongchun Z,et al.Variations of natural gas carbon isotope-type curves and their interpretation-A case study[J].Organic Geochemistry,2007,38(8):1 398-1 415.
[8]韩国猛,石倩茹,司维柳,等.滨海地区深层天然气成因类型及气源分析[J].油气地质与采收率,2012,19(2):20-22.
[9]戴金星.天然气碳氢同位素特征和各类天然气鉴别[J].天然气地球科学,1993,4(2/3):1-40.
[10]戴金星,秦胜飞,陶士振,等.中国天然气工业发展趋势和天然气地学理论重要进展[J].天然气地球科学,2005,16(2):127-142.
[11]王真.东营凹陷北部沙四段盐下天然气成因及来源[J].油气地质与采收率,2009,16(1):5-8.
[12]李文涛.民丰洼陷深层天然气地球化学成因[J].油气地质与采收率,2009,16(2):36-38.
[13]宋岩.影响天然气组分变化的主要因素[J].石油勘探与开发,1991,18(2):42-49.
[14]张林晔.济阳坳陷天然气的判识标志[J].石油实验地质,1991,13(4):355-369.
[15]戴金星,倪云燕,李剑,等.塔里木盆地和准噶尔盆地烷烃气碳同位素类型及其意义[J].新疆石油地质,2008,29(4):403-410.
[16]田辉,王招明,肖中尧,等.原油裂解成气动力学模拟及其意义[J].科学通报,2006,51(15):1 821-1 827.
[17]王政军,朱光有,王政国,等.原油降解气的形成条件及其特征[J].天然气工业,2008,28(11):29-33.
[18]王苗,廖远涛,邓大飞,等.南堡凹陷1号构造带东一段储层物性特征及其控制因素[J].油气地质与采收率,2012,19(4):14-17.
[19]朱光有,张水昌,赵文智,等.中国稠油区浅层天然气地球化学特征与成因机制[J].中国科学:D辑地球科学,2007,37(S2):80-89.
[20]齐雪峰,吴晓智.准噶尔盆地南缘安集海河组沉积环境及油气地质意义[J].新疆石油地质,2009,30(3):289-292.
[21]宋元林,胡新平.呼图壁气田紫泥泉子储层特征及综合评价[J].西安石油学院学报:自然科学版,2001,16(4):15-19.
[22]秦胜飞.塔里木盆地库车坳陷异常天然气的成因[J].勘探家,1999,4(3):21-23.
[23]Chung H M,Gormly J R,Squires R M.Origin of gaseous hydrocarbons in subsurface environments:Theoretical considerations of carbon isotope distribution[J].Chemical Geology,1988,71(1/3):97-104.