西加拿大沉积盆地二白斑页岩孔隙空间对微生物活动的制约

发布时间：2018-07-08 19:28

本文选题：生物标志化合物 + 生物降解　；参考：《石油实验地质》2017年04期

【摘要】：运用激光粒度仪、氮气吸附实验和色谱—质谱联用方法,对西加拿大沉积盆地(西加盆地)阿尔伯塔东南气田(Southeast Alberta Gas Field,SAGF)A井二白斑(Second White Specks)页岩13个生物气源岩样品进行粒度、比表面、孔径分布测试和烃类分子组成分析,探究浅层烃源岩孔隙空间与页岩中烃类生物降解之间的关系。研究样品有机质含量丰富,埋深浅,处于适合微生物活动的未成熟阶段,孔径分布显示样品的孔隙主要集中在中孔(2~50 nm)范围。分子地球化学参数分析表明,页岩中有机质组成主要受有机质输入和沉积环境的影响,烃类生物降解作用不明显。结合页岩孔径分析认为,目前页岩绝大部分孔隙空间都无法为微生物提供可生存环境,仅少量大孔(200 nm)可能为页岩中的微生物活动提供有限空间。能大规模产生物气的气源岩应具有较大比例的孔径大于200 nm的孔隙。传统的生物气源岩评价标准可能对页岩孔隙空间这一限制微生物活跃性的因素有所忽视。
[Abstract]:By means of laser particle size analyzer, nitrogen adsorption experiment and chromatography-mass spectrometry, 13 samples of shale biogas source rocks from South East Alberta Gas Field SAGF A well A in West Canada Sedimentary Basin (Xijia Basin) were studied. The relationship between pore space of shallow source rocks and biodegradation of hydrocarbons in shale was investigated by means of specific surface, pore size distribution test and analysis of hydrocarbon molecular composition. The samples are rich in organic matter, shallow in depth and in the immature stage suitable for microbial activities. The pore size distribution shows that the pore size of the sample is mainly concentrated in the mesoporous range (2 ~ 50 nm). The analysis of molecular geochemical parameters shows that the composition of organic matter in shale is mainly affected by the input of organic matter and sedimentary environment, but the biodegradation of hydrocarbons is not obvious. Based on the pore size analysis of shale, it is concluded that most pore spaces of shale can not provide a viable environment for microbes, and only a small number of large pores (200nm) may provide limited space for microbial activities in shale. Gas source rocks that can produce gas on a large scale should have a large proportion of pore size larger than 200 nm. Traditional criteria for evaluating biogas source rocks may ignore shale pore space as a limiting factor for microbial activity.
【作者单位】：中国地质大学(北京)能源学院;卡尔加里大学地球科学系;
【基金】：国家自然科学基金“孔隙空间对未成熟泥岩中微生物活动及生物气形成过程的控制”(41273062)资助
【分类号】：P618.13

【相似文献】