中文摘要：

基于沁水盆地东北部和顺煤层气区块高煤级烟煤储层的物性、压汞及扫描电镜资料,对该煤层气储层的孔隙结构特征进行分析。该煤储层RO值分布在1.8～2.5,为贫煤,其镜质组含量主要分布在62%～80%,平均约为70.02%;惰质组含量主要分布在10%～25%,平均约为18.48%;V/I（镜质组/惰质组）值主要分布在2～30之间。所研究煤储层中的有效空间系统以孔隙和微裂缝为主,建立了同时考虑孔隙和微裂缝的高煤级煤岩阶段入汞及退汞过程曲线模型。入汞曲线模型与煤岩渗透率具有较好的匹配关系,在分析煤岩孔隙系统连通性方面比退汞曲线模型更为可靠。微裂缝相对发育的煤岩渗透率较高,排采初期往往具有较高产能,但其产能递减相对较快,最终会有相当一部分天然气滞留于地层中而无法被开采,因此最终采收率相对较低。微裂缝欠发育的煤样渗透率较低,开发初期产能较低,但其生产周期却相对较长,最终采收率相对较高。因此,对于国内部分地区微裂缝发育情况相对较差的煤储层而言,初产能力可能相对偏低。但从长远来看,由于其最终采收率更高,生产周期较长,最终累积产气量也会更大。该认识可以为煤层气排采开发方案的合理制定提供参考。

英文摘要：

The pore structure characteristics of coal bed methane reservoir is analyzed on the ba- sis of study of material physical property of high rank coal reservoir ,mercury injection,and scan- ning electron microscopy in northeastern region of Qinshui basin. Ro of coal reservoir mainly is in the range between 1.8 and 2. 5 ,the vitrinite contents mainly between 62% and 80% ,with an average of 70. 02%. The inertinite contents mainly range from 10% to 25%, 18.48% on average and V/I value mainly ranges from 2 to 30. Mercury injection curve analysis model foe high rank coal reservoir is established in terms of the pore and micro fractures tested by mercury injection test. It shows that, this model can well describe the variation characteristics and its relationship with permeability of the high rank coal mercury curve. The mercury curve model is proved to be more reli- able than the mercury withdrawal curve model on the analysis of coal rock pore system connectivity. Coal rocks with relatively high microfractures usually have relatively high permeability and higher capacity, but its capacity decreases relatively fast, leading to part of the gas in the stratum unable to recover. Coal rocks with relatively poor microfractures have relatively low permeability, they tends to have lower capacity in the early stage of development. But its production cycle is relatively long,and the ultimate recovery is relatively high. Therefore, for the development of coal reservoir with relatively poor microfractures in domestic, the initial capacity may be relatively low. But in the long run, due to its ultimate recovery is higher and long production cycle, the final cumulative gas production will also be great.