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巢湖蓝藻腐殖化过程中形态与成份变化研究

ISSN号：1000-0674
期刊名称：微体古生物学报
时间：0
页码：152-160
分类：P618.13[天文地球—矿床学;天文地球—地质学]
作者机构：[1]安徽大学资源与环境工程学院,合肥230601, [2]中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所,无锡214151
相关基金：国家自然科学基金资助项目（40972092,41172121）,国家自然科学基金与中石化联合基金（40739902）共同资助.
相关项目：藻类有机质烃源形成及生烃过程碳同位素变化的微生物地球化学模拟研究

关键词：蓝藻, 腐殖化, 早期成岩, 形态, 成分, 热重/差热分析, cyanobacteria, decaying, early diagenesis, morphological changes, organic composithermogravimetric/ differential thermal analysis

中文摘要：

通过对巢湖蓝藻进行微生物腐殖化改造，模拟藻类早期成岩过程，对蓝藻样品进行光学显微镜和扫描电镜形态观察，并对蓝藻样品有机元素、族组分和同位素数据及热重／差热进行分析。研究表明：蓝藻经微生物改造后，由群体生存逐渐转变为以个体形式存在，体内生化成分逐渐被降解。蓝藻样品有机N、s元素经微生物降解后，含量不断减少，蓝藻氯仿沥青A含量最高可达11．98％。进入厌氧阶段后，饱和烃和芳烃组分大量生成，沥青质含量明显增加，非烃部分减少。芳烃碳同位素富集^13C，其它族组分逐渐富集^13c。蓝藻气态烃排放量最大量为4．0％，游离态烃排放量随处理过程的深入逐渐增大，最高可达47．7％，烃排放的总吸热量逐渐减少，最低为14．77mw·s／rag。微生物对蓝藻改造过程效果显著，可为藻类烃源岩研究提供现代对比实例。

英文摘要：

Microbially degraded cyanobacteria samples were obtained in the early diagenesis simulation experiments and several analysis methods, such as observations on morphology by optical microscope and scanning electronic mi- croscope, organic elements and components and tbermogravimetric/ differential thermal analyses were applied. After microbial degradation, cyanobacteria convert gradually from group survival into separate individual, accompanied by changes in biochemical composition. The contents of organic nitrogen and sulphur decrease and the chloroform bitu men ＂A＂ reaches the highest 11.98~. In anoxic period, large quantities of saturated and aromatic hydrocarbons are generated and the content of asphaltenes is significantly higher than the initial value, while the non-hydrocarbons de creasing. The data of carbon isotope composition suggests aromatic hydrocarbons enrich a2C and other components enrich ^13C. As degradating, the emissions of hydrocarbon gases and free hydrocarbons gradually increase, reaching 4.0% and 47.7% respectively. The amount of heat absorption of hydrocarbon emission decreases gradually to the lowest, with the value of 14.77 mW·h/mg. The decay of cyanobacteria by microbial degradation is efficient, which provides a case study of hydrocarbon source from cyanobacteria.

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