天然气地球科学 ›› 2020, Vol. 31 ›› Issue (12): 18141825.doi: 10.11764/j.issn.1672-1926.2020.06.010
符宏斌1(),苑坤2,卢树藩1,陈相霖2,林拓2,杜胜江1(),何犇1,罗香建1
Hong-bin FU1(),Kun YUAN2,Shu-fan LU1,Xiang-lin CHEN2,Tuo LIN2,Sheng-jiang DU1(),Ben HE1,Xiang-jian LUO1
摘要:
为探讨高煤级煤的微观孔隙结构特征及其对含气性的影响,选取黔西地区黔普地1井龙潭组5件高煤级煤样品,分别采用高压压汞、低温N2吸附和CO2吸附对各煤样的纳米级孔隙进行定量表征,基于BJH和DFT方程分别计算孔隙的孔径、孔体积和比表面积,分析煤的微孔(孔径<2 nm)、介孔(孔径2~50 nm)和宏孔(孔径>50 nm)的孔径分布特征,并统计各级孔径对孔体积和比表面积的贡献率。在低温N2吸附实验的基础上,运用FHH模型分析了高煤级煤孔隙结构分形性质及其控制因素。采用线性拟合的方法,讨论了高煤级煤的持续演化对微孔和介孔的影响,以及各级孔径的比表面积对含气性的控制作用。结果表明:微孔、介孔和宏孔对孔体积的贡献率分别为49.47%、33.22%及17.31%,对比表面积的贡献率依次为85.44%、14.35%及0.21%;高煤级煤的孔隙形态可分为2类:小于3.7 nm的孔主要以一端开口的孔为主,大于3.7 nm的孔则主要为两端开口的孔和细颈瓶孔;孔隙分形维数随着地层压力的增加而增大,且以3.7 nm为界,大孔隙比小孔隙具有更加复杂的空间结构;微孔和介孔随镜质体反射率呈现规律性的变化,微孔的大量形成与煤大分子空间结构演化导致的介孔体积缩小有关;微孔对CH4吸附量的控制作用远超过介孔和宏孔,小于2 nm的微孔为煤层气的吸附提供了主要的空间。
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