天然气地球科学 ›› 2008, Vol. 19 ›› Issue (4): 524–529.doi: 10.11764/j.issn.1672-1926.2008.04.524

• 天然气地球化学 • 上一篇    下一篇

柴达木盆地三湖地区生物气地球化学特征及重烃组分成因分析

贾星亮, 周世新, 宋振响, 王保忠   

  1. (1.中国科学院地质与地球物理研究所气体地球化学重点实验室,甘肃 兰州 730000;2.中国科学院研究生院,北京 100049)
  • 出版日期:2008-04-20 发布日期:2008-04-20
  • 作者简介:第一作者 Email:dengjh@cnooc.com.cn.
  • 基金资助:

    国家“十五”重大科技攻关项目(编号:2003BA613A05)资助.

Geochemical Characteristics of Biogenic Gas and Heavy Hydrocarbon Origin in Sanhu Region of Qaidam Basin

GU  Xing-Liang, ZHOU  Shi-Xin, SONG  Zhen-Xiang, WANG  Bao-Zhong   

  1. (Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, 
    Department of Geochemistry, Yangtze University, Jingzhou 434023, China)
  • Online:2008-04-20 Published:2008-04-20

摘要:

柴达木盆地三湖地区的天然气区是目前我国发现的最大生物气区。系统采集了该区涩北一号气田、涩北二号气田和台南气田不同气层组的35个天然气样和11个地层水样,进行了天然气组分和碳、氢同位素分析,同时对地层水的氢、氧同位素也进行了分析。结果表明:天然气组分以甲烷为主,CH4>99%,C2+<0.15%,干燥系数为0.999;气体同位素组成特征为-68.6‰<δ13, C1<-63.9‰, -50.6‰<δ13,C2<-40.7‰, -36.2‰<δ13,C3<-31.9‰,-234.7‰<δD1<-214‰;δ13 C1与δD1关系图和δD H 2O与δD1关系式都显示出三湖地区生物甲烷形成途径以CO2还原为主。认为三湖地区生物气中重烃与该盆地热成因重烃地球化学特征明显不同,其重烃成因复杂,可能为生物成因和低温热成因共同作用的结果。

关键词:  柴达木盆地, 生物气, 地层水, CO2还原, 重烃成因

Abstract:

The quantitative evaluation of hydrocarbon\|generating potential of source rocks in the basin is the key problem which should be solved in the oil and gas exploration. Tiancao sag develops many sets of source rocks, but the main source rock is still unclear, and the report about the evaluation of source rock has not been seen. This research takes the dark color mudstone of the Tian 2 well as the dissection object, and takes advantage of many parameters such as organic matter abundance, the type and maturity of organic matter to describe quantitively or qualitatively the hydrocarbon\|generating potential characteristics of the dark color mudstone. Results indicate that the source rock's organic matter abundance of the lower segment in Lower Crataceous Bayingebi Formation is the highest and the thermal evolution is at the mature stage, the organic matter type isⅡ2—Ⅲ, so it should be the main hydrocarbon source rock of Tiancao sag; The organic matter abundance of Lower Crataceous Suhongtu Formation is higher, whose organic matter type isⅡ 2, while its hydrocarbon source rock maturity is not high, therefore, it is the secondary hydrocarbon source rock of Tiancao sag. Although the total organic carbon content of Carboniferous and Jurassic is high, the hydrocarbon generating potential is low and the organic matter type is only Ⅲ, nowadays R O>3.0%, so it is at the overmature stage and belongs to the depletive source rock.

Key words: Tiancao sag, Source rock evaluation,  Organic matter abundance, Organic matter type, Organic matter maturity.

[1]徐子远.柴东生物气勘探的实践与思考[J].中国石油勘探,2006,6:33-37. 
[2]周翥虹,周瑞年,管志强.柴达木盆地东部第四系气源岩地化特征及生物气前景[J].石油勘探与开发,1994,21(2):32-37. 
[3]张晓宝,徐子远,段毅,等.柴达木盆地三湖地区第四系生物气的形成途径与运聚方式[J].地质论评,2003,49(2):168-174.
[4]魏国齐,刘德来,张英,等.柴达木盆地第四系生物气形成机理、分布规律与勘探前景[J].石油勘探与开发,2005,32(4):84-89.
[5]惠荣耀,李本亮,丁安娜,等.柴达木盆地三湖凹陷岩性气藏的勘探前景[J].天然气地球科学,2005,16(4):443-448.
[6]戴金星,陈英.中国生物气中烷烃组分的碳同位素特征及其鉴别标志[J].中国科学:B辑,1993,23(3):303-310.
[7]徐永昌.天然气成因理论及其应用[M].北京:科学出版社,1994:98-99.
[8]Whiticar M J,Faber E.Schoel M.Biogenic methane formation in marine and freshwater environments:CO2 reduction vs. acetate fermentation-isotope evidence[J].Geochimica et Cosmochimica Acta,1986,50:693-709.
[9]Schoell M.The hydrogen and carbon isotopic composition of methane from natural gases of various origins[J].Geochimica et Cosmochimica Acta,1980,44:649-661.
[10]戴金星,裴锡古,戚厚发.中国天然气地质学(卷二)[M].北京:石油工业出版社,1996:82-205.
[11]Daniels L,Fulton G,Spencer R W,et al.Origin of hydrogen in methane produced by Methane bacterium thermoautotrophicum [J].J Bacteriol,1980,141:694-698.
[12]Smith J W,Pallasser R.Microbial origin of Australian coal-bed methane[J].AAPG Bulletin,1996,80:891-897.
[13]王万春, 刘文汇, 刘全有.浅层混源天然气判识的碳同位素地球化学分析[J].天然气地球科学,2003,14(6):469-472.
[14]Devon Rowe,karlis Muehlenbachs.Isotopic fingerprints of shallow gases in the Western Canadian sedimentary basin: tools for remediation of leaking heavy oil wells[J].Organic Geochemistry,1999,30:861-871.
[15]Devon Rowe,Atis Muehlenbachs.Low-temperature thermal generation of hydrocarbon gases in shallow shales[J].Nature,1999,398:61-63.
[16]徐永昌,刘文汇,腾格尔,等.陆良、保山气藏碳、氢同位素特征及纯生物乙烷发现[J].中国科学:D辑,2005,35(8):758-764.
[17]Mattavelli L,Martinenghic.Deep isotopic light methane in northern Italy[J].Bacterial Gas,1992,121-132.
[18] Lewis S D.Isotope Compositions of Gases in Sediments from the Chile Continental Margin
[C].Proceedings of the Ocean Drilling Program Scientific Results,1995,141:307-312.
[19] 张晓宝,胡勇,马立元,等.柴达木盆地西部第三系盐湖相天然气碳氢同位素特征、成因和分布[J].中国科学:D辑,2002,32(7):598-608.
[20] 赵东升,李文厚,吴清雅,等.柴达木盆地天然气的碳同位素地球化学特征及成因分析[J].沉积学报,2006,24(1):135-140.
[21] 王万春, 刘文汇, 高波, 等.我国浅层复合气藏中天然气的成因鉴别[J].天然气工业,2003,23 (3):20-23.
[22] James A T.Correlation of natural gas by use of carbon isotopic distribution between hydrocarbon components[J ].AAPG Bulletin, 1983, 67: 1176-1191.
[23] 戴金星.各类烷烃气的鉴别[J].中国科学:B辑
[JP4],1992,(2):183-193.
[24] 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):1-40.

 

[1] 崔明明,王宗秀,樊爱萍,高万里. 鄂尔多斯盆地苏里格气田西南部地层水特征与气水关系[J]. 天然气地球科学, 2018, 29(9): 1364-1375.
[2] 滕龙,殷启春,方朝刚,郑红军,沈雪华,朱红兵,陈基炜. 利用高密度电阻率法预测第四系浅层生物气——以江苏省南通地区为例[J]. 天然气地球科学, 2018, 29(5): 719-728.
[3] 杨丽杰,侯读杰,陈晓东,刁慧. 东海盆地西湖凹陷中部古近系地层水化学特征及地质意义[J]. 天然气地球科学, 2018, 29(4): 559-571,596.
[4] 李跃林,赵晓波,王雯娟,白坤森,熊钰. 近井带干化盐析和反凝析对高温气藏后期单井产能的影响——以中国南海崖城13-1高温凝析气藏为例[J]. 天然气地球科学, 2018, 29(1): 140-150.
[5] 赵志平,官大勇,韦阿娟,刘朋波,付立. 渤海海域新生界地层水化学特征及主控因素[J]. 天然气地球科学, 2017, 28(9): 1396-1405.
[6] 董凌峰,刘全有,孙冬胜,林娟华. 建南气田天然气成因、保存与成藏[J]. 天然气地球科学, 2015, 26(4): 657-666.
[7] 李周,罗卫华,赵慧言,吴昊,张广东. 硫吸附和地层水存在下的单质硫沉积规律研究[J]. 天然气地球科学, 2015, 26(12): 2360-2364.
[8] 苏丕波,乔少华,付少英,梁金强,苏明,杨睿,吴能友. 南海北部琼东南盆地天然气水合物成藏数值模拟[J]. 天然气地球科学, 2014, 25(7): 1111-1119.
[9] 张景茹,何家雄,陆军文,龚晓峰,张伟. 南海北部陆缘合浦盆地低熟油气/生物气成藏条件及勘探前景[J]. 天然气地球科学, 2014, 25(2): 212-220.
[10] 苗忠英,王晶,潘春孚,何大祥,赵兴齐. 漠河盆地生物气形成条件及存在证据[J]. 天然气地球科学, 2013, 24(3): 512-519.
[11] 高阳, 金强, 帅燕华, 王浩. 渤海湾盆地生物气成因类型与成藏条件[J]. 天然气地球科学, 2011, 22(3): 407-414.
[12] 田继先, 孙平, 张林, 张绍胜, 郭泽清, 陈艳鹏. 利用地震属性预测柴达木盆地三湖地区第四系生物气藏[J]. 天然气地球科学, 2010, 21(2): 305-309.
[13] 罗霞,王雪,李剑,方伟,张英,冯子辉,伍大茂,,刘伟. 应用有机质降解程度法评价生物气源岩[J]. 天然气地球科学, 2009, 20(6): 945-950.
[14] 邹艳荣, 魏志福, 蔡玉兰, 陶伟, 刘金钟. 非生物成因气与松辽盆地深层气:综述与思考[J]. 天然气地球科学, 2009, 20(5): 657-663.
[15] 钱诗友, 曾溅辉. 东营凹陷沙河街组地层水化学特征及其石油地质意义[J]. 天然气地球科学, 2009, 20(4): 603-609.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!