低场核磁共振技术在煤炭岩相孔隙结构中的应用

发布时间：2018-12-17 02:55

【摘要】：用自旋-自旋弛豫(T2)反演谱研究了哈萨克斯坦(Kazakhstan,KZ)、新疆伊吾县(Yiwu county,YW)、新疆白石湖(Baishi lake,BS)及新疆东坝区(Dongba district,DB)烟煤在饱水前后与饱锰后的岩相结构差异以及孔隙中流体的分布状况。结果表明,各煤样在饱水前,其质子弛豫信号均以束缚水为主,而饱水后,均出现自由水弛豫信号,且后三个煤样的束缚水信号强度明显增强;哈国煤样的自由流体饱和度最大,束缚流体饱和度最小,意味着其含油饱和度最大,是后三个煤样的4-6倍;哈国煤样的孔隙度相对最大,而伊吾县煤样相对最小;经过饱水处理,四个煤样的微孔数量均有所减少,而后三个煤样的小孔数量显著增加;哈国煤样的渗透率高达22.87%,为后三个煤样的3-20倍。这显然与其孔隙度和孔径差异相关,也是不同地域成煤地质环境差异和发育程度不同的反映。
[Abstract]:Spin-spin relaxation (T2) inversion spectra were used to study Kazakhstan (Kazakhstan,KZ), Xinjiang Yiwu County (Yiwu county,YW), Baishi Lake (Baishi lake,BS) and (Dongba district, in Dongba region, Xinjiang. DB) the lithofacies structure of bituminous coal before and after saturation and the distribution of fluid in pores. The results show that the proton relaxation signal of each coal sample is mainly bound water before saturation, but free water relaxation signal appears after saturated water, and the intensity of bound water signal of the latter three coal samples is obviously enhanced. The maximum free fluid saturation and the lowest irreducible fluid saturation of coal samples in Kazakhstan mean that the oil saturation of coal samples is the largest 4-6 times of that of the latter three coal samples the porosity of coal samples in Kazakhstan is relatively largest and the coal samples in Yiwu County are relatively the smallest. After saturated water treatment, the number of micropores of the four coal samples decreased, the number of the pores of the latter three coal samples increased significantly, and the permeability of the coal samples of Kazakhstan was as high as 22.87, 3-20 times of that of the latter three coal samples. This is obviously related to the difference of porosity and pore size, and it is also a reflection of the difference of coal forming geological environment and development degree in different regions.
【作者单位】：新疆维吾尔自治区煤炭清洁转化与化工过程重点实验室新疆大学化学化工学院;
【基金】：国家自然科学基金新疆联合基金(No.U1503293) 新疆高校科研计划项目(No.XJEDU2016S025)资助~~
【分类号】：TD166

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