阜康砂沟先导试验区煤储层物性特征及有利区评价

Study on Physical Properties of Coal Reservoir in Fukang Shagou Pilot Test Area

为明确阜康砂沟先导试验区煤储层的物性特征,通过开展岩心观察、薄片鉴定、测井资料及煤样化学分析、含气量测定、等温吸附试验、孔隙度测定等研究,结合灰色关联法对主力煤层进行综合评价。结果表明,阜康砂沟先导试验区的主力煤层为侏罗系八道湾组39、41、42号煤层,多为半亮型、半暗型煤,显微组分以镜质组为主。煤储层原煤具含水量较低、灰分低、高挥发等特征。煤储层含气量较高,且随深度增加而增加,兰氏体积与兰氏压力均较高,含气饱和度为中-高等,临界解吸压力中等。主力煤层开采有利区综合评价表明,该区资源量丰富,有进一步开发的内在条件。

In order to clarify the physical properties of coal reservoir in Fukang Shagou pilot test area,core observation,thin section identification,logging data analysis,coal chemical analysis,gas content determination,isothermal adsorption test and porosity determination were carried out,and the main coal seam was comprehensively evaluated by grey correlation method.The results show that the main coal seams in Fukang Shagou pilot test area are No.39,No.41 and No.42 coal seams of the Jurassic Badaowan Formation,which are mostly semi-bright coal and semi-dark coal.The macerals are mainly vitrinite.The raw coal of coal reservoir has the characteristics of low water content,low ash content and high volatilization.The gas content of coal reservoir is high,and increases with the increase of depth.The Langmuir volume and Langmuir pressure are high,the gas saturation is medium to high,and the critical desorption pressure is medium.The comprehensive evaluation of the favorable area of main coal seam mining shows that the area is rich in resources and has internal conditions for further development.