【摘要】 以澳大利亚东部的波恩、苏拉特、加利利三大含煤盆地为例,对煤岩沉积背景、煤质特征、储层特征、保存条件等煤层气地质特征进行了系统对比分析与总结。结果表明,三大含煤盆地都具有较高的含气量和含气饱和度。沉积背景是煤质的主要影响因素,三大含煤盆地的煤岩经历了不同的煤化阶段,其吸附能力、渗透率、含气量等存在差异。大自流盆地对这三大盆地煤层气藏的富集有重要影响,表现为一方面较强的水动力影响到煤层气保存,另一方面给煤层次生生物气的产生创造了条件,提高了煤层的含气量。更多还原

【Abstract】 This paper,based on eastern Australia’s coal basins Bowen,Surat and Galilee,compares their sedimentary settings,coal quality,reservoir and conservation,with results showing that the three basins are high in methane content and saturation,and sedimentary setting is the key to coal quality. The coal rocks of the three basins are at different coalification stages,which leads to the variance of their adsorption,permeability and gas content. The Great Artesian Basin plays a vital part in coalbed methane accumulation in the three basins from a strong hydrodynamic force which not only is related to coalbed methane preservation,but also contributes to the high methane content from coalbed secondary biological gas production.更多还原