邢台矿区煤储层孔隙特征分析

发布时间：2018-03-19 20:18

本文选题：煤储层　切入点：孔隙　出处：《中国煤炭地质》2016年11期 　论文类型：期刊论文

【摘要】：为查明邢台矿区煤储层孔隙分布特征对煤层气含气量和可采性的影响,对采自邢台矿区不同生产矿井的6个煤样进行了镜质组最大反射率、压汞实验分析,结果发现该区煤储层孔隙具有如下特征:6个煤样平均孔隙度为5.87%,对煤层气的储集开发贡献一般,其大小与煤变质程度和大孔含量关系密切;煤储层吸附孔平均含量达74.29%以上,渗流孔含量很少,这对煤层气的储集非常有利,但影响煤层气的开发;6个煤样的中孔孔容都不太发育,成为煤层气渗流的“瓶颈”;3~17 nm的孔隙对孔体积和比表面积具有控制作用,大孔、中孔几乎不起作用;分析6个煤样的压汞曲线发现,孔隙类型以半封闭孔、封闭孔为主,孔隙连通性较差,不利于后期煤层气的开采,应加强此类储层煤层气钻井工艺和开采技术研究,通过储层改造来改善煤层气的可采性。
[Abstract]:In order to find out the influence of pore distribution characteristics of coal reservoir in Xingtai mining area on the gas content and recoverability of coal bed methane, the maximum vitrinite reflectance and mercury injection were analyzed for 6 coal samples from different production mines in Xingtai mining area. The results show that the porosity of coal reservoir in this area has the following characteristics: the average porosity of six coal samples is 5.87, the contribution to the development of coalbed methane is general, its size is closely related to the degree of coal metamorphism and the content of macropore, the average content of adsorption pore in coal reservoir is more than 74.29%. The content of percolation pore is very small, which is very beneficial to the coalbed methane reservoir, but it affects the development of coalbed methane, and the pore volume of 6 coal samples is not very developed, and the pore at 317nm is the "bottleneck" of coalbed methane percolation, which can control the pore volume and specific surface area. The mercury injection curves of 6 coal samples show that the pore type is semi-closed, the main pore is closed, and the porosity connectivity is poor, which is not conducive to the exploitation of coal bed methane in the later stage. In order to improve the recoverability of coalbed methane, the drilling technology and production technology of this kind of reservoir should be strengthened.
【作者单位】：河北省煤田地质局第二地质队;中国矿业大学资源与地球科学学院;
【分类号】：P618.11

【相似文献】