Study On Logging Interpretation Method Of Coalbed Methane On Baode Area

As the exploration and development of coalbed methane and market share increase year by year,the logging interpretation and evaluation of coalbed methane becomes more important.According to the interpretation results of CBM,the coal bed methane in the coal bed methane reservoir can be reasonably exploited to achieve the maximization of resource utilization.In this paper,the characteristics of coal bed methane storage in baode were studied,and the experimental study on coal core of coal reservoir,including the analysis of pore permeability measurement results,nuclear magnetic porosity analysis,isothermal adsorption experiment and rock mechanics parameter analysis,obtained the relationship between porosity and permeability,the gas-bearing property of coal seam and the pressure characteristics of reservoir top floor,established the coal bed gas logging interpretation model in baode area,provided comprehensive data analysis for the production and development,gave a detailed theoretical basis,and compared the various parameters calculated by the coal bed methane log interpretation model in baode area to the actual production results to ensure the real and reliable calculation results.According to the characteristics of the coal reservoir obtained in the experiment,the combined interpretation model of coal bed gas is constructed by using conventional logging methods,including evaluation of the industrial components of coal bed gas,physical assessment of coal bed gas storage,gas and water-bearing performance of coal bed gas reservoir,analysis of rock mechanical parameters of coal bed and evaluation of bottom plate evaluation and gas production of coal bed gas.Through the comprehensive evaluation of logging data,the relationship between coal seam pore size and adsorbed gas was obtained,and the main coal seam structural features,physical properties and gas-bearing characteristics(including adsorbed gas and free gas)in Baode area were clarified.RW / RT,CAL and GR to indicate the gas production,and to evaluate the liquid-containing property of coal seam top and bottom plates,and to eliminate the influence of top and bottom plates on the coal seam productivity.The free gas is calculated by difference method and porosity method.The CBM interpretation methods listed in this model can be extended to CBM interpretation and evaluation in other blocks with high practical value and profound significance.