利用CO2-ECBM技术在沁水盆地开采煤层气和埋藏CO2的潜力

利用CO₂-ECBM技术在深部煤层进行CO₂埋藏不仅对减缓全球气候变暖具有重大意义，而且能够促进煤层气增产，是CO₂减排最有效方式之一。沁水盆地为一NNE复向斜构造，其边缘地区由于断裂发育、强水动力条件和煤矿的开采，不利于CO₂埋藏。盆地中心区稳定的构造环境、弱水动力条件及良好的区域性盖层为CO₂埋藏提供了很好的保存条件。依据前人关于CO₂/CH₄等温吸附特性相关实验参数，初步评价了CO₂-ECBM技术在沁水盆地开采煤层气和埋藏CO₂的潜力。结果表明：CO₂-ECBM技术可使沁水盆地煤层气可采量增加1.04×10¹² m³，埋藏CO2量可达47.7×10⁸ t。

Analysis on the potential of the carbon dioxide-enhanced cealbed methane (CO2-ECBM) recovery in the Qinshui basin

The geological storage of CO2 in deep coal seams by use of the CO2 sequestration and enhanced coalbed methane (CO2-ECBM) technology, which is an effective means to reduce the release of CO2 into the atmosphere, will not only help slow down global warming but also stimulate the increase of the recovery ratio of coalbed methane. The Qinshui basin presents NEE synclinoria structure, the marginal area of which has disadvantages for CO2 storage because of well developed faults and fractures, coal mining and a strong hydrodynamic condition; while the centre of which provides good advantages for CO2 storage due to its stable structure, favorable regional caprocks and weak hydrodynamic condition. According to the related laboratory parameters of CO2/CH4 adsorption isotherm collected by the predecessors, this paper preliminarily analyzed on the potential of CO2-ECBM in the Qinshui basin. The result from this analysis shows that this CO2-ECBM recovery will possibly help increase the recovery ratio of coalbed methane up to 1.04 tcm and the quantity of CO2 storage up to 4.77 billion tons.