沁水盆地东缘洪水地区15号煤层储层特征研究

摘要

The Hongshui area is situated at the middle of eastern margin of Qinshui Basin, the coal No.15 is one of main mineable coal seams in the area. Based on CBM parameter well tested data, well testing data and coal geological exploration data, carried out No. 15 coal reservoir characteristic study. The result has shown:No.15 coal in the area belongs to highly metamorphosed meager coal, coal res-ervoir permeability 0.047~0.11m/d, thus a low permeability coal seam; reservoir pressure gradient 0.402~ 0.965MPa/100m, average 0.672MPa/100m, an under-pressure stratum;coal seam gas content 9.02~20.67m3/t, average 16.18 m3/t, a high gas content coal seam. As a whole, the study area belongs to low permeability, low reservoir pressure gradient and low ratio of critical desorption pressure to reservoir pressure, high gas content CBM enrichment area.%洪水地区位于沁水盆地东缘中部，15号煤层是该区主要的可采煤层之一，根据区内煤层气参数井测试数据、试井资料及煤炭地质勘查资料，对15号煤层储层特征进行了研究。结果显示：研究区15号煤层为高变质程度的贫煤，煤储层渗透率在0.047～0.11mD，属低渗透率煤层，储层压力梯度为0.402～0.965MPa/100m，平均为0.672MPa/100m，属于欠压地层，煤层含气量为9.02～20.67m3/t，平均16.18m3/t，含气量较高。整体来看，研究区属于低渗透、低储层压力梯度和临储比，高含气量的煤层气富集区。