摘要
为了深入研究煤变质作用对煤储层孔隙系统发育特征的影响,通过镜质组反射率测试、压汞实验和低温液氮吸附实验等手段,探讨了BET比表面积与微孔体积的关系,分析了煤变质程度对孔隙度、微孔体积及BET比表面积的影响。结果表明:煤孔隙度随煤级的增高呈现高—低—高的变化规律,在Ro值为2.3%左右时达到极小值;微孔体积随煤级的升高亦呈现出高—低—高的变化规律;BET比表面积随微孔体积的增加呈线性增加趋势,并且随煤级的升高呈现高—低—高的变化规律,在Ro值为2.5%时达到最小值。另外,利用扫描电镜对部分沁水盆地高煤级样品进行观察,发现热成因孔普遍分布,这成为高煤级煤孔隙度和BET比表面积增大的重要原因。
In order to research further the effect of coal metamorphic process on pore system of coal reservoirs,through vitrinite reflectance test,mercury intrusion experiment and low temperature liquid nitrogen adsorption experiment,the relationship between BET specific surface area and volume of micropore was investigated,and the effect of coal metamorphic process on porosity,volume of micropore and BET specific surface area was analyzed.The results show that the porosity values of coal samples present a trend of high-low-high variation along with the rising of coal rank,and attain the minimal value when Ro=2.3% ;the micropore volume of coal samples also presents a trend of high-low-high variation along with the rising of coal rank;the BET specific surface area of coal samples presents a linear increase along with the increasing of micropore volume,and presents a trend of high-low-high variation along with the rising of coal rank,and attains the minimal value when Ro=2.5%.Furthermore,utilize scanning electron microscope to observe some high rank coal samples of Qinshui basin,find that thermogenic pores are very widespread in those coal samples,and those thermogenic pores cause the porosity and BET specific surface area of high rank coal enlarged.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第9期1506-1511,共6页
Journal of China Coal Society
基金
国家科技重大专项(2008ZX05034)
国家重点基础研究发展计划(973)项目(2009CB219600)
关键词
煤
变质作用
孔隙系统
孔隙度
微孔体积
比表面积
coal
metamorphic process
pore system
porosity
micropore volume
specific surface area
