Resource Characteristics And Optimization Of Coalbed Methane In Liu Panshui Coalfield

Liu Panshui coalfield,which is full of coalbed methane,is the important coalbed methane enrichment region in our country.However,the area is a typical area of mixed coal seam,high stress,tectonic coal and coalbed methane resources occur in complex geological conditions,making it difficult to directly in the traditional selection methods and indexes of application in the study area.Therefore,this thesis chose Liu Panshui coalfield as the research object;summarized the research achievements of predecessors,the comprehensive collection of research and well logging data;collect the coal,roof of the coal,floor of the coal and groundwater samples in the study area;based on the industrial analysis of coal and rock,maceral analysis,gas composition analysis,mercury injection experiment,permeability test,isothermal adsorption experiment of nitrogen;triaxial coal and rock mechanics experiment,etc.Summarizing the resources condition,desorption seepage condition,engineering condition and coal reservoir energy distribution.Based on “one ticker veto + hierarchical optimization” and the theory of tradition coal reservoir energy system innovation theory for the optimization of favorable coalbed methane,analyzed the optimization result,put forward a set of suitable for much of the research region of coalbed methane geology selection index system and method,provide the basis for the follow-up of coalbed methane exploration and development.In the study area,the structure is complex.The whole area is shown as the medium to high stress state and the normal abnormal high pressure reservoir pressure.The coalbed methane in the area is mainly methane,with an average gas content of 12.24m3/t,which has obvious features of syncline gas control.The gas content of the coal seam fluctuates with the horizon,and the depth of the weathered zone is about 150 meters.Based on the calculation of coalbed methane resources and resource abundance of 13 major secondary Syncline in the study area,the distribution characteristics of resources are analyzed.Research shows that Qingshan syncline,Guan Xiangxie,lattice mesh bottom syncline and Lang Dai syncline syncline and Tucheng CBM resources a large amount of disk;Guan Xiangxie,Ping Guan syncline,Tucheng syncline,old Pu Dahebian syncline syncline,coal seam gas abundance is higher;six branches,arbutus syncline syncline,Bulang syncline and Beaulieu syncline resources the amount and resource abundance are low,poor conditions of coalbed methane resource.