摘要
对采自扬子地区寒武系黄柏岭组、幕府山组和牛蹄塘组的泥页岩进行了甲烷吸附性能及影响因素研究。所分析页岩的TOC含量在1.08%～4.16%之间;粘土矿物含量在36.7%～62.3%之间。页岩样品甲烷吸附量测定结果显示,寒武系页岩甲烷最大理论吸附量与页岩TOC含量之间总体上呈正相关性,表明有机质丰度是控制页岩甲烷吸附能力的重要因素。而粘土矿物总含量与页岩甲烷最大理论吸附量之间缺乏相关性,仅蒙脱石含量与页岩甲烷最大理论吸附量呈正相关性,显示个别粘土矿物具有较强的甲烷吸附及影响页岩吸附性能的作用。寒武系不同地区页岩吸附性能存在显著差异,遵义牛蹄塘组页岩甲烷最大理论吸附量在2.76～5.30mL/g之间;南京幕府山组页岩甲烷最大理论吸附量在1.36～4.35mL/g之间;池州黄柏岭组泥页岩甲烷最大理论吸附量在1.63～2.72mL/g之间。此外,寒武系不同地区页岩有机碳含量与甲烷吸附量之间关系变化很大,显示页岩吸附量不仅受有机质丰度类型的影响,而且受有机质成熟度、区域地质演化以及粘土矿物吸附等多种因素制约。
The methane sorption capacities of Cambrian shales from the Huangbailing , Mufushan and Niutitang formtions and their controlling factors have been investigated.The TOC contents of these shales vary from 1.08% to 4.16 % and their clay mineral contents range from 36.7% to 62.3%.The methane sorption capacities of these Cambrian shales display apositive correlation with their TOC contents and indicate that organic matter content is the primary factor of controlling the sorption capacities of these shales.On the other hand , there is no correlation between total clay mineral contents and the methane sorption capacities ,while the shales with higher montmorillonite content appear to have relative higher methane sorption capacities.These imply that only individual clay mineral may have some sorption capacity in these Cambrian shales.The methane sorption capacities of these Cambrian shales also show regional variation among the samples from these three strata Formations of different region.The methane sorption capacities of Niutitang Formation shales from Zunyi and Mufushan formation shales from Nanjing are in the range of2.76～5.30 mL / g and 1.36～4.35 mL / g , respectively ;while the methane sorption capacity of Huangbailing Formation shales from Chizhou ranges from 1.63 to 2.72mL / g.The relationship between TOC content and methane sorption capacity also show significant variation among these shales from different Formations and indicates that the methane sorption capacity of shales are not only controlled by the abundance and types of organic matter , but also affected by the thermal maturity of organic matter , regional geological evolution and aswell as the sorption of clay minerals.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2013年第7期1041-1048,共8页
Acta Geologica Sinica
基金
国家"973"项目04课题(编号2012CB214704)
国家自然科学基金项目(编号41273058)资助成果
关键词
页岩气
甲烷吸附量
有机碳含量
粘土矿
寒武系页岩
shale gas
the methane sorption capacity
TOC content
clay minerals
Cambrian shales
