摘要
醇、酮等中性含氧化合物是微生物改造有机质和向生物气转化的中间产物之一。松辽盆地滨北地区白垩系生物气源岩RO值为0.33%～0.70%,中性含氧化合物中醇类极为丰富,主要检测出了正构一元醇,碳数分布为8～32,多数样品以正十二醇为主峰,少数样品以C17、C18醇为主峰。从部分样品中还检出了酮系列化合物,从正辛酮至正三十一酮均有分布。醇、酮化合物的相对含量均随着埋藏深度的增加和层位的变老而减少,并与非烃的减少和饱和烃含量的增加相对应,这表明在成岩作用阶段微生物对滨北地区有机质存在明显的改造,这是生物气形成的重要前提条件之一。
Alcohol and ketane compounds are the intermediate products,which organic matter will have been transformed into biogas in the immature source materials.The abundance of neutral bearing-oxygen,especially,alcohol compounds are higher in source rocks from the Cretaceous system in the Binbei area, Songliao basin. It mainly includes normal monoalcohol from C_8(or C_9)to C_(32), the more samples are with C_(12) dominant position, and another samples are C_(17) or C_(18) as main peak.A series of ketane compounds is determined in some samples collected from the Binbei area.These compounds mainly contain 2-,3-,4-,5-,6-,7- chain ketanes and a isoprenoid-ketane, which has the highest peak.The content of the 2-ketane is more than 3-ketane or 4-ketane,with C_(13) to C_(31)carbon number.But C-5,C-6,C-7 alkyl ketane co-overflow.Those compounds could suggest the input of terrestrial higher plant and animal transformed by microbes.The relative contents of all alcohol and ketane compounds decrease with increasing of depth or oldening of age,meanwhile non-hydrocarbon also decrease, but saturated hydrocarbon increases.It is suggested that bearing-oxygen compounds in non hydrocarbon via biochemical reaction are transformed into saturated hydrocarbon,this offeres the significant evidences for the obvious modification of microbes in the diagenetic stage,and this is an essential prerequisite of biogas generation.
出处
《天然气地球科学》
EI
CAS
CSCD
2004年第4期360-366,共7页
Natural Gas Geoscience
关键词
醇和酮含氧化合物
生物气
源岩松辽盆地
Neutral bearing-oxygen compounds
Biogas
Source rock
Songliao basin.
