Eastern Margin Of The Coal In Situ Stress Measurement Of The Ordos Basin

The stress related to coalbed methane reservoirs in various stages of coal reservoir permeability have a high correlation,but also assessed as recoverable reserves Liulin block,provide an important theoretical basis for the overall development program design and ground engineering design.In this thesis,the stress on the preliminary test data Liulin block is analyzed and summarized collected pre-situ stress test work on the Liulin block the stress test methods are described in detail on the block to the development of stress characteristics were analyzed to establish a comprehensive geological and gas production forecast model Liulin block,the overall production capacity of the whole block,including the cumulative gas production,ultimate recovery,etc,simulation predictions.Obtained by testing the Willows area lump reservoir pressure:pressure on the coal group 2.58-9.40MPa,average:5.90MPa,the group of coal pressure 3.31-8.48MPa,average:6.04MPa,with seam burial depth increases,reservoir pressure will also increase accordingly;pressure gradient on the set of coal:0.457-1.12MPa/100m,the group of coal pressure gradient:0.529-1.07MPa/100m,lower than normal hydrostatic pressure,are under voltage condition;coal seam permeability:0.01-4.9410-3?m2,average:0.56 10-3?m2,greater range,showing the heterogeneity of coal seam permeability and complicated nature,belong to the low permeability zone.A total of 14 coal-bearing layers in the region,coal layer 7 layers are thick coal seam 10.49m;main goal coal bed methane development is good stability,simple structure,large thickness and shallow.Using constitutive element theory,logging data,and rock experimental parameters,the actual calculation of the stress in three directions well area size.If the area where the test can be representative of the Willows area,the implementation of a single well in any multi-well area combined mining technology,only from the mechanical point of view,there is no problem.Throughout the Liulin block production of coal bed methane reservoirs in the case and the case of coal and rock mechanics,coal is relatively stable,while developing 3#,4#,5#coal bed methane is feasible,there is a good seal file layers.Select the best wells in some areas west,south or east in.Coal nd rock mechanics stability,to achieve the purpose of engineering geology.