河北省煤储层物性特征分析

根据煤田地质勘探实测资料,结合汞孔径测试、扫描电镜显微裂隙观测、煤层气试井分析成果及等温吸附曲线,分析河北省煤储层物性特征。结果显示：煤层饱和吸附量受煤级控制,煤级增加,吸附能力增大;随煤层埋深增加,煤层含气量和甲烷体积分数均呈增大趋势;中孔在褐煤中比较发育,而在其他煤级中例外;储层中宏观裂隙与宏观煤岩类型关系密切;显微裂隙发育程度镜煤好于亮煤,低煤级煤好于高煤级煤;峰峰、万全、大城矿区试井渗透率较高,开平煤田不同地区煤储层渗透性变化较大。该研究为河北省煤层气的合理开发提供了依据。

Physical properties analysis of coal reservoirs in Hebei province

In response to the slight progress made in the coal bed methane exploration and development in Hehei province, this paper presents an analysis of the physical properties of coal reservoirs of Hebei province, based on the measured data of coal geological exploration and combined with the results of pressured-mercury testing of pore structure, micro-cracks observation under the scanning electron microscope, the well test analysis , and isothermal adsorption curves. The results show that the saturated adsorption of coal bed, subjected to control of the coal rank, increases, depending on coal rank ; both coalbed gas content and methane concentration tend to increase along with the burial depth of coalbed; the mesopores develope well in lignite except in other coal ranks; macro-cracks are closely related with the types of macro coal-rock, and the micro-fractures develope better in vitrain than in clarain and better in the low rank coal than in the high rank of coal, and test wells located in Fengfeng, Wanquan and Dacheng mining areas show higher permeability, but give obviously varying permeability in different areas in coalfield of Kaiping. The present study provides evidence for the rational exploitation of coal bed methane in Hebei province.