沟底井田3号煤层微裂隙特征研究

Study on Micro-fracture Characteristics of the No.3 Coal Seam in Goudi Well Field

为掌握沟底井田3号煤层微裂隙发育特征,借助EVO25型扫描电子显微镜对煤层微裂隙进行了观测研究。结果表明:煤层发育张裂隙和剪裂隙,二者产状稳定性、裂隙长度、裂口宽度、裂口充填程度等各具差异。张裂隙的产状稳定性、长度、裂口平滑程度不及剪裂隙,但张裂隙的裂口宽、呈张开状、充填较轻,渗透性优于剪裂隙。煤层微裂隙被充填情况总体严重,煤层孔渗性变差。

In order to master the development characteristics of micro-fracture in the No.3 coal seam in Goudi wellfield,the micro-fractures in the coal seam are observed and studied with the help of the EVO 25 type scanning electron microscope.The results show that there are coal seam tension fractures and shear fractures in the coal seam,and the occurrence stability,fracture length,fracture width and fracturefilling degree of the two are different.The occurrence stability,length and stomium smoothness of the tension fracture are less than those of the shear fracture,but the stomium width,opening,lightfilling and permeability of the tension fracture are better than those of the shear fracture.The micro-fractures in the coal seam are generally seriouslyfilled,and the porosity and permeability of the coal seam become poor.