Study On Gas Adsorption & Desorption Characteristics In Panji Deep Mining Area In Huainan

The study of coal and gas are around the development of coalbed methane, adsorption desorption characteristics of coal reservoir is related to the mining and exploration of coalbed methane, and it is an important research content for the production and development of coalbed methane resource. The deep exploration area of Huainan coal field is the most important research area in recent years, drilling exploration data and the gas geological exploration datas are relatively rich.In this paper,based on the gas desorption data, drilling exploration data, industry analysis of field and underground coal samples, isothermal adsorption and desorption experiments, mercury experiments, hypothermia experiments and the results of experiments in liquid nitrogen component of coal for coal-bed methane desorption, the desorption rate, desorption time, gas saturation, gas and other aspects of the theoretical maximum recovery analysis, in order to reveal the adsorption and desorption characteristics of deep coal reservoirs.Through geological exploration drilling gas desorption method, use half of time of drilling,use the relationship between critical desorption pressure and the coal reservoir pressure conversion of gas desorption time as coalbed methane desorption time points, respectively, in order to calculate the gas desorption quantity and loss quantity at the scene,calculate desorption rate, desorption speed and desorption time; Calculate the containing gas under saturation by using isothermal adsorption equation porosity data、 industrial data, and also use the measured pressure of the coal reservoir to calculate gas quantity by putting the data into isothermal adsorption curve, to analyze the coal gas saturation in the reservoirs, coal reservoir theoretical maximum recovery.When analysis the adsorption desorption characteristics in deep coal reservoir, contrast the different desorption characteristics about each coal samples under the condition of same temperature and same pressure, comparison the different characteristics using the deep coal seam and shallow coal seam adsorption desorption data.According to the characteristics of the adsorption and desorption data, to analyze the influence by moisture, temperature, pressure, components of coal and rock, coal seam buried depth, porosity, etc.Through the analysis, to reveal the deep coal reservoir and the to reveal the adsorption desorption characteristics of the deep deep coal reservoir under high temperature and high pressure, revealing adsorption desorption characteristics differences and the reasons between deep coal reservoir and shallow coal reservoir,...