天然气地球科学 ›› 2004, Vol. 15 ›› Issue (1): 51–57.doi: 10.11764/j.issn.1672-1926.2004.01.51

• 天然气地球化学 • 上一篇    下一篇

松辽盆地滨北地区生物气源岩酸性含氧化合物的分布及其地球化学意义

丁安娜1, 宋桂侠2, 惠荣耀1, 卢双舫3   

  1. (1.中国科学院兰州地质研究所,甘肃 兰州 730000;2.大庆油田勘探开发研 究院,黑龙江 大庆 163712;3.大庆石油学院,黑龙江 大庆 163318)
  • 收稿日期:2003-10-30 修回日期:2003-11-28 出版日期:2004-02-20 发布日期:2004-02-20
  • 通讯作者: 丁安娜
  • 作者简介:丁安娜(1946-),女,辽宁营口人,副研究员,主要从事有机地球化学及微生物 地球化学研究

DISTRIBUTION OF ACID BEARING-OXYGEN COMPOUNDS AND ITS GEOCHEMICAL SIGNIFICANCE  IN SOURCE ROCKS OF BIOGAS, BINBEI AREA,#br#  SONGLIAO BASIN

DING An-na 1, SONG Gui-xia 2, HUI Rong-yao 1, LU Shuang-fang 3   

  1. (1. Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzh ou 730000, China; 2. Daqing Research Institute of Petroleum Exploration and Dev elopment, PetroChina, Daqing 163712, China; 3. Daqing Petroleum College, Daqing  163318, China)  
  • Received:2003-10-30 Revised:2003-11-28 Online:2004-02-20 Published:2004-02-20

摘要:

松辽盆地滨北地区白垩系源岩有机质演化程度低(Ro值为0.33%~0.70%),可溶有机质酸性非烃主要由正构一元酸、正构二元酸、姥鲛烷酸、植烷酸、藿烷酸和甾烷酸等化合物组成。其中正构一元酸含量占绝对优势并呈两种分布形态(一为单峰型,以C16为主峰,C18、C14丰度较高,生源母质主要为藻类等水生生物;二为双峰型,前峰群以C16为主峰,后峰群为次主峰,以C24为主,前峰群表征水生生物输入,后峰群表征有陆源高等植物输入),各形态均呈现偶奇优势(与生物脂肪酸合成酶合成双碳乙酰单元有关);正构二元酸含量较低;藿烷酸含量高于甾烷酸。随着埋藏深度的增加,多数样品的姥鲛烷酸/植烷酸的比值及甾烷酸/藿烷酸的比值均减小,表明沉积环境逐渐向还原环境转化。认为由于酸性含氧化合物尤其是正构烷基脂肪酸的脱羧反应,故在形成正构烷烃的同时形成CO2,不仅为产甲烷菌提供了大量营养能源,而且也提供了呼吸代谢的基质;在青山口组和嫩江组时期,湖盆面积扩大,水体加深,区域内出现滨浅湖―半深湖相沉积,因此滨北地区局部时空范围内可形成商业性生物气田。

关键词: 酸性含氧化合物, 生物气, 地球化学, 松辽盆地

Abstract:

The immature or lower-mature sourc e rock was collected from the Cretaceous of Binbei area in Songliao Basin, with  low vitrinite reflectance of 0.33%~0.70%. Acid bearing-oxygen compounds in non-hydrocarbon consisted of normal-monocarboxylic acid, normal-binarycarboxylic  acid, pristane acid, phytane acid, hopanoid acid and steroid acid. Normal monoa cid had a higher content and occurred two modeles of peak distribtuion, the one  was single peak group with C16   dominant position and C 18  , C 14    higher aboundance, which indicated the input of algae, the other had two peak gr oups, the fromer with C16   main peak characterized by aquatic organisms sou rce matirials, the latter group was secondary, with C24   higher peak, this  suggests the input of terrestrial higher plants transformed by bacteria. Those a cid non-hydrocarbon was dominated by even carbon number, due to the fatty acid  synzyme of organisms synthetized acetyl unit with two carbon atom. Normal binary acid had a lower content and the amount of hopanoid acid was more than steroid a cid. In the most of samples, those ratios of Pr/Ph acid and ster/hopan acid decr eased with increasing of depth,this suggests that depositional envirenment chan ges to reducing conditon. ;
As de-carboxyl reaction taked place, acid bearing-oxygen compounds, in particu lar nonmal alkyl fatty acid was formed into hydrocarbon and CO -2, not only supp lied for the large amount of nutritive energy-carbon origin, also supplied for  the largest substrate of respiratory metabolism to methanogenic bacteria During  Qingshankou and Nenjiang periods of Cretaceous, water system changed to deep wit h expanding of lake area, shallow and mid-deep lacustrine facies deposit occurr ed at parts of Binbei area, leading to biogas field was formed.

Key words: Acid bearing-oxygen compound, Biogas, Geochemistry, Songliao basin.

中图分类号: 

  • TE122.1+13


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