海石湾井田窑街组煤储层特征分析

Coal Reservoir Characteristics Analysis of Yaojie Formation in Haishiwan Coalfield

根据海石湾井田钻探揭露情况,结合钻孔的煤质和瓦斯资料,通过扫描电镜、常规压汞和等温吸附实验,对海石湾井田煤二层进行了煤储层特征及含气性分析。研究表明:煤二层平均厚度19.61 m,属中灰、低硫、高挥发分、中发热量煤;煤储层孔隙率平均8.45%,孔隙类型以有机质晶间、晶内孔隙为主,最大进汞饱和度平均82.65%,Langmuir体积为10.16~11.45 m^(3)/t,Langmuir压力为2.25~2.79 MPa。即煤二层具有厚度大、孔隙率大、孔隙连通性好、兰氏压力大的特点。

Based on the data of drilling, coal quality and gas, the coal reservoir characteristics and gasbearing capacity of No.2 coal in Haishiwan coalfield are analyzed by means of scanning electron microscope, conventional mercury injection and Isothermal adsorption experiments. The results show that the average thickness of No.2 coal is 19.61 m, medium ash, low sulfur, high volatile, medium calorific coal. The porosity is 8.45%. The pore type is mainly interinterinterinterorganic pores. The maximum incoming mercury saturation is on average 82.65%. The langmuir volume is 10.16 to 11.45 m^(3)/t,the Langmuir pressure is 2.25 to 2.79 MPa. No.2 coal has the characteristics of large thickness, large porosity, good connectivity of pores and high langmuir pressure.