Logging Evaluation Research Of The Coal Measures Strata Property,Permeability And Hydrocarbon In Baode Block

In Coalbed methane CBM production,some problems are experienced,such as high water production for longer time interval and causes difficult to lower pressure and to conduct the desorption of methane.It's very important to preindicate coal seams water containing and water production during CBM development.The relatioanship between coal seams water production and the three factors,such as water containing,gas content and coalbed permeability,which is our key research direction.Factors for water production in the drainage process are analyzed by making full use of conventional logging information and imaging logging information.It is commonly believed that more moisture in roofs and floors of coal seams is an important water source.According to laboratory tests and analysis,founded water containing estimate method and calculate modules.On the basis of drainage data and well logging information,created water production forecast method in coal seams only and coal seams with it's roofs and floors,and detected water production level in difference well in the field.Using lots of coal core analysis data,perfect calculation model of coal seam gas content.Using Imaging logging data with conventional logging data,which is to carry out the evaluation of the coal structure,to explore the influence of the structure of coal seam to the gas content.Using the data from the coal cores isothermal adsorption tests,to establish the gas content model.Deepening those researchs,to establish the Planar distribution trend of the coal seam gas content and the differet methods of gas content calculation.Using coal core analysis and well test datas,to carry out the coal physical property analysis,and establish a method of coalbed permeability.Establishing a good ralationship between building porosity parameters and testing permeability,which is to evaluate permeability prediction.Using quantitative evaluation of reservoir permeability based on the electric imaging logging,and the correlation between logging parameters calculating seam hole and fracture permeability to improve coal seam permeability evaluation precision.Combining the drainage actual data and logging data to create the strata water containing and water production forecast method,which improve evaluation method of the gas content calculation method and permeability.All of those are the very important technical supports to make the fracturing plan in CBM development.