阳泉矿区15号煤层储层物性特征研究

阳泉矿区是我国最大的无烟煤生产基地之一,15号煤层是该区的主采煤层之一。文章以煤田地质勘探资料和煤层气试井资料为基础,结合实验室测试分析数据,研究了15号煤层的储层物性特征。结果表明:本区15号煤层为变质程度较高的瘦煤—无烟煤,埋藏深度为400～800 m;厚度介于2.00～11.00 m,平均为6.50 m,煤层厚度的分布具有明显的分异性,表现为北高南低,西高东低的总体趋势;渗透率为0.43×10-3um2,属于中等偏低;储层压力为4.67 MPa,压力梯度为0.85 MPa/hm,属于略欠压储层;临储压力比较低,可能在煤层气排水降压方面具有一定的困难。

Study Characteristics of Reservoir Properties on No.15 Coal Seam in Yangquan Mining Area

Yangquan Mining Area is one of the largest anthracite production base,No.15 coal seam is the of main mining seams in this area.This article is based on coal geological exploration and coalbed methane well testing,it studied the characteristics of reservoir properties on No.15 coal seam in combination with analysis data by laboratory testing.The results show that there were high degree thin-anthracite coal on No.15 coal seam;the depth is 400～800 m;the thickness is 2.00～11.00 m,average is about 6.50 m,the thickness distribution of coal seam has obvious differentiation,the general trend is from north to south and from west to east;the permeability is 0.43×10-3 um2,belong to the lower-middle level;the reservoir pressure is 4.67 MPa;pressure gradient is 0.85 MPa/hm,belong to a little under-voltage reservoir;the temporary storage of pressure ratio is relatively low,it's difficult to drainage buck aspects for the coalbed methane.