Study Coal Reservoir Characteristics In Pingdingshan Coalfield

Our country coal reservoir characteristics have been undertaken for many years,in order to adjust our country energy structure,achieve energy and environmental sustainability development.With the development of coalbed methane research in recent years,the physical characteristics of coal has made great progress.Coal is a complex porous media,composed of the skeleton particles,pore,throats,interstitial material and diagenetic material. Its pore structure,permeability,other physical properties and coalbed methane adsorption,migration has a close relationship.The research of Pingdingshan coalfield characteristics,have a great help for comprehensive management and energy development.Pingdingshan coalfield located in Pingdingshan City,Henan Province,east to west about38km and north-south width of10-20km, the coal area of650km2,the main coal layer10layers,the total thickness of15-18m,mainly coking coal,fat coal,a small amount of gas coal. Now, the main mining groups is group D, group E and group F in the Permian,in which the seam of group F has occurred prominent35, the seam of the group E has occurred prominent16.Therefore,study coal reservoir characteristics in the area, analysis coal reservoir pore structure,the type of coal structure, this has important implications for coalbed methane exploration and development and gas control.This article take the underground observation and indoor testing research methods of a combination,with the Leitz the MPV-3microscope photometer, ASAP2000surface area and pore size distribution analyzer,pressure mercury vapor analyzer and other test instruments. Coal macerals,coal facies,coal rock microfractures in the low-temperature nitrogen adsorption and mercury porosimetry pore structure test for collection coal samples of Pingdingshan coalfield, coal reservoir characteristics of the area, the results show that:①he study area distribution of the more flowing water peat swamp phase and wet forest-swamp phase,has a good condition geological conditions to produce associated gas.②Coal samples metamorphic grade in the study area,overall coal microfractures in the number of articles with the coal degree of metamorphism increase tended to increase.③In the study area,the coal sample pressure mercury experimental results show that the coal surface area is increased with increasing coal rank.From the mercury intrusion curve to see:the high Colliery Gzl No. kind of pore development in the best CBM gathering,migration and desorption are very favorable.8Mine Bk4like, poor development of the throat, so that the large hole, hole, holes between connected poor, the kind of coal pore structure mainly holes mainly the type of hole level less CBM aggregation and migration effect is not.④The surface test in low-temperature liquid nitrogen showing the level domain, and geographical features, BJH total pore volume differences and the specific surface area differences in performance,BJH average pore diameter difference greater,basically the opposite than the surface area differences in performance.Area of coal sample low-temperature nitrogen adsorption the slope of the curve to start with small change,and then to rise slowly from small to big, steepening the pressure close to Po,the pore structure type can be divided into three kinds.⑤Coal adsorption isotherm characteristics of balanced water conditions is strongly influenced by the macerals,pore volume with showing a tendency to increase with the increase of inertinite content.The data and conclusions obtained by experimental,the analysis provides some theoretical basis for the coalbed methane exploration in the area of development for coal and gas outburst. Comprehensive analysis that eight mine is the most favorable area for the development of coalbed methane resources.