不同煤阶煤层气运移通道的差异性研究 .pdfVIP

学兔兔 第24卷4期 中 国 煤 炭 地 质 Vo1．24 No．04 2012年 4月 C0AL GEOLOGY OF CHINA Apr． 2012 doi：10．3969~．issn．1674—1803．2012．04．06 文章编粤：1674—1803(2012)04—0024—03 不同煤阶煤层气运移通道的差异性研究 王庆伟1,2，王勤旺 ， (1．中国矿业大学(北京)，北京 100083；2．中国煤炭地质总局，北京 100039) 摘 要：不同煤阶运移通道的差异性研究可对煤层气开发工艺的选择和参数的确定具有重要的理论意义和指导生产 的实际意义。利用达西渗流理论，判定了煤层气流态和渗透率之间的关系，进而借助实验室方法测定了不同煤阶煤 储层的渗透率，最终利用煤层气流态建立了煤储层渗透率与运移通道的关系，总结出了不同煤阶煤层气运移通道的 差异性：①低煤阶：煤储层运移通道是基质孔隙起主导作用；②中煤阶：煤储层运移通道是割理、裂隙并重；③高煤 阶：煤储层运移通道是裂隙起主导作用。 关键词：煤阶；运移通道；差异性；流态；渗透率 中图分类号：TE311．2 文献标识码：A Migration Pathway Discrepancy Study of CBM in Coal Reservoirs with Different Coal Ranks Wang Qingwei1,2 Wang Qinwang · (1．College of Geoseience and Surveying Engineering，CUMTB，Beijing 100083； 2．China National Administration of Coal Geology，Beijing 100039) Abstract：The study on migration pathway discrepancy of CBM in coal reservoirs with different coal ranks has important theoretical and practical significances in selection of CBM exploitation technology and parameters．Using Darcys theory on seepage flow has bridged relations between CBM flow pattern and permeability．Then in virtue of laboratory method，measured perm eability of coal reservoirs with different coal ranks，finally summed up the CBM migr~ion pathway discrepancy in coal reservoirs with different coal ranks：(1)in low coal rank reservoir，the pathway is mainly through matrix pores；(2)in medium coal rank reservoir，through both cleats and fractures；(3)in high coal rank reservoir，mainly th