摘要
生物气不仅能以常规生物气藏的形式存在,而且还能以水合物、页岩气或煤层气等非常规形式存在,是非常重要的天然气资源。通过分析漠河盆地微生物生存所需的温度、盐度、酸碱度、生存空间和营养底物来源等条件,并结合微生物生命活动的证据认为:①漠河盆地地层水盐度不高、酸碱度适中、营养底物充足,具备微生物生命活动所需的基本条件;②饱和烃气相色谱出现"鼓包"现象,检测出25-降藿烷、乙烯和丙烯,δ13C1值小于-60‰,以及相邻地区发现生物气等现象是该区存在生物气的证据;③第四系受季节变换的影响,可周期性生成乙酸发酵型原生生物气;上侏罗统微裂缝发育段可形成CO2还原型次生生物气。生物气不仅是漠河盆地重要的天然气资源类型,也是天然气水合物潜在的气源之一。
Biogenic methane is an important resource which exists in conventional microbial gas reservoir, and unconventional microbial gas, such as hydrate, shale gas, coalbed methane, and so on. By the analysis of the living environment of microbes, such as temperature, salinity, pH, living space, nutrient substrates, and so on,and combined with the evidence for active microbe,i（s thought that： （1） The appropriate formation water salinity,moderate pH,abundant nutrition are beneficial for the microbial life activities. （2） The phe- nomenon of GC presenting bulge phenomenon,the detected 25-norhopane, ethene and propene, the 813 C1 -60‰ ,and the emergence of biogenic gas in the adjacent areas,and so on,is the evidences of the existence of biogenic gas in the area. （3） Influenced by the seasonal variation,the primary biogenic gases of acetate fermentation are formed periodically;the reduced secondary biogenic gases of carbon dioxide are formed in the micro-fractures member of Upper Jurassic. In the Mohe Basin, biogenic gas is not only the important natural gas resource style, but also one of the potential gas sources of hydrate.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2013年第3期512-519,共8页
Natural Gas Geoscience
基金
国家自然科学基金(编号:41202100)
"天然气水合物资源勘查与试采工程"国家专项(编号:GZHL20110322)联合资助
关键词
生物气
生存环境
营养底物
地球化学
生烃模式
漠河盆地
Biogenic gas
Living environment
Nutrient substrates
Geochemistry
Hydrocarbon generationmodel
Mohe Basin
