School of Energy Resources, China University of Geosciences (Beiing) Coal Reservoir Laboratory of National
Engineering Research Center of Coalbed Methane Development & Uillization

为了深入探究煤岩类型与煤储层孔裂隙的耦合关系,表征韩城矿区煤储层孔隙纵向非均质性,选取了韩城矿区4种煤岩类型的煤样,采用X射线层析扫描技术,模拟和重构了韩城矿区煤储层内部孔裂隙、煤岩基质和矿物的形态与空间分布格架,建立了三维立体重构模型,实现了对不同煤岩类型孔裂隙分布的三维可视化精细表征。试验结果表明:不同的煤岩类型,孔裂隙的发育程度不同,但CT变化值较为一致,基本呈双峰分布,相较于半亮煤、半暗煤和暗淡煤,光亮煤孔裂隙发育程度最高,孔隙分布非均质性最强,孔裂隙连通性最好,并且从光亮煤到暗淡煤,呈现出孔裂隙的发育程度和连通性逐渐变差,矿物充填程度和小孔含量逐渐升高的趋势。

In order to further explore the coupling relationship between the lithotypes and the coal reservoir pore-fracture system, superficial characteristics the vert ical heterogeneity in Hancheng Mining Area, coal samples of different lithotypes in Hancheng mining area were selected. Using the X ray tomography, the form and spa ce distribution of pore-fracture system, matrix and mineral of coal in Hancheng area were simulated and reconstructed, and the three-dimensional reconstruction model was established, finally the fine characterization of the three dimensional visualization of different lithotypes was realized. The results show that the series isorank coal of Hancheng have the characteristics of that the different of lithotypes have the different pore-fracture development degree, but the change of CT values were the same which the distribution were bimodal as a whole. Compared to the semibright coal, semidull coal and dull coal, the bright coal pore-fracture system development degree was the highest, the heterogeneity of pore distribution was the strongest, and the pore-fracture system connectivity was the best. Furthermore, from the bright coal to th e dull coal, the development degree and connectivity of the pores are gradually becoming worse, the flling degree of the mineral and the content of the micorpores are i ncreasing.

国家科技重大专项资助项目(2016ZX05042-002)；国家自然科学基金资助项目(41272175)；中央高校基本科研业务费专项资金资助项目(2652015331)；