Study On Logging Interpretation Method Of Coalbed Methane Reservoir Of Shanxi Formation In Area C Of Northern Henan Province

The study area is located in the northern part of Henan Province,and coal resources are very rich.At present,coalbed methane in Zone C in northern Henan Province will enter the development stage.In order to serve exploration and development work,it is necessary to strengthen the comprehensive geological research of coalbed methane,so it is particularly important to strengthen the study of fine interpretation methods of coalbed methane logging in the study area.Based on a large number of literature surveys at home and abroad,this paper collected and consolidated the geological data,core test data,and logging data of the northern area of Henan Province,and summarized the prediction methods of coal seam industrial composition,porosity,permeability,and coalbed gas content.Firstly,the collected logging data was preprocessed.Secondly,the CBM reservoir logging response characteristics analysis and stratigraphic division and comparison were performed.Then,based on the core test data and logging data of the study area,the study areas were established respectively.The prediction model of the composition,porosity and permeability of the coal and rock industry.Finally,based on the experimental data of core adsorption and desorption,a study of the coal bed gas content was conducted.The study shows that the formation of Shanxi Formation in this area is thick in the east and thin in the west,with an average of 91 m,and the coal seam is on average 0.95 m,showing that the east is thick in the east.Based on core test data and logging data from key wells,and by combing common industrial component calculation methods,this paper uses the volume model method and regression analysis method.Predict the industrial composition of coal seams,and select regression analysis method as the calculation model of coal and rock industrial components in this area;based on collected core test data and logging data,a simplified Archie formula estimation method is used to calculate coal seam fractures Porosity;using natural gamma,sonic time difference and lateral resistivity log data and core test data,the FS method and regression analysis method were used to predict the permeability of the coal seam.The prediction results of the two methods were compared and found.The regression analysis method The prediction results are closer to the core test data,so the regression analysis method is used to predict the coal seam permeability.Based on the experimental data of core adsorption and desorption,the isothermal adsorption method,regression analysis method and neural network method are used to measure the coal seam gas content in the area.The predictions were compared.The results of the three methods were compared with the experimental data.Method higher accuracy,so the regression method as the predictive model coalbed methane content.The fine interpretation method of coalbed methane logging established in this paper has a reference effect on the adjacent area.