生物气源岩中原核生物改性指标与评价新方法  

Activity of bacteria and archaea in immature or lower-mature organic matter and new appraisal methods for biogas source rocks

作　　者：丁安娜[1] 卢双舫[2] 冯子辉[3] 惠荣耀[1] 方伟[3] 王跃文[3] 

机构地区：[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 [2]大庆石油学院地质科学院 [3]中国石油大庆油田公司勘探开发研究院

出　　处：《石油勘探与开发》2008年第1期59-66,共8页Petroleum Exploration and Development

基　　金：中国石油大庆油田分公司科技攻关项目(10100812003100010)

摘　　要：在调查原核生物化学分配作用对有机质饱和烃中主要生物标志化合物和咔唑类化合物分布产生影响的基础上，借助微生物学领域的研究成果，对柴达木盆地东部和松辽盆地北部两地区泥岩样品进行地球化学分析。确定可利用规则甾烷／17a（H）-藿烷值、C35β升藿烷指数、奥利烷指数、BNH／TNH等参数及（C28—C31）-烷基甾烷丰度的变化对未熟—低熟有机质中细菌和古菌活性进行评价。在淡水— 咸水沉积域的强厌氧环境中，生气母质的有机氮含量与产甲烷八叠球菌属的固氮作用有关，来自原生质的含氮杂环化合物在产甲烷条件下，被产甲烷菌伙伴所降解，因此在优质生气母质中，C0—C3咔唑和苯并咔唑化合物的总含量很低，比其他类型样品低1～2个数量级左右。The geochemical analyses of samples from both east Qaidam Basin and north Songliao Basin are implemented based on examining the influence of the activity of bacteria and archaea on the distribution of main biomarkers in saturated hydrocarbons and on the content of carbazole derivatives, with the aid of microbiological research results. Studies suggest that the regular sterane/17a （ H）hopane value, C35 aβ homohopane index, oleanane index, BNH/TNH ratio, and the abundance change of C28-C31 alkyl steranes can be used to appraise the activity of bacteria and archaea. In the strongly anaerobic environment from fresh water to saline water, the content of organic nitrogen in gas-generated materials is related to the nitrogen fixation of methanosarcina. Under the methaneproducing condition, nitrogen-bearing heterocyclic compounds from protoplasm are degraded by methanogenesis partners. Thus, the contents of carbazole, methyl-carbazole and benzol-carbazole compounds are lower about 1 to 2 order of magnitude in excellent biogas source rocks than in other type samples.

关 键 词：细菌 古茵 生物气源岩 未熟低熟有机质 柴达木盆地 松辽盆地 

分 类 号：P593[天文地球—地球化学]