Characterization Of Coalbed Methane Accumulation And Reservoir Under The Background Of Magma Invasionn In Lin-xing District

Good physical properties of coal reservoirs are the basis of coalbed methane accumulation and enrichment.Identification of coal reservoir properties and reservoir model has been key to the efficient development of coalbed methane,coal-bed methane accumulation model under the background of magma intrusion is an important practical issue to coalbed methane exploration and development.In this paper,study the coalbed methane reservoir reconstruction and CBM accumulation mechanism under the influence of superposition of Zijinshan Rock Mass in Yanshanian period.Through the geological,drilling,logging and seismic data analysis,multi-technology coal reservoir properties experimental tests to explore CBM reservoir evolution,the process of grow and storage,CBM reservoir formation mechanism and accumulation model in the influence of magma intrusion,expect to provide the guidance for the efficient development of CBM.The main achievements and achievements are as follows:1.From the aspects of tectonic evolution,sedimentary geology,magmatic activity and so on,the coal seam distribution and cap rock condition in Linxing area are analyzed,the process of tectonic-thermal evolution-coalbed methane formation in the study area is fitted.It is pointed out that the formation of the Carboniferous to Permian coal-bearing strata in the Linxing area reaches the maximum depth in the middle period of the Jurassic,and the strata began to rise slowly,the magma intruded during the middle of the Cretaceous,and the coal rank was in Yanshan period,the coal is in the form of a belt around Zijinshan rock mass.In addition to the deep role of coal in the formation of hydrocarbon generation,the degree of different experience of abnormal secondary secondary hydrocarbon generation.2.Using mercury porosity and permeability detection and reservoir X-CT three-dimensional reconstruction and other technical means,described and evaluated the physical characteristics of coal reservoirs from the basic characteristics of coal and rock quality and the pore form and permeability of coal reservoir.The results show that the magmatic activity has a dual effect on the coal reservoir reconstruction.The “positive effect” shows that the number of large and medium holes in the coal reservoir near the Zijinshan rock mass is obviously increased,and the segregation and seepage conditions are improved.“Negative effect” refers to the gas kinetic energy are increased under the action of magma heat,gas adsorption capacity of coal are decreased,and the coalbed methane accelerated to escape.under the condition of fault and fracture system development.3.Based on the comprehensive analysis of sedimentation characteristics,tectonic evolution and comprehensive control of hydrogeological geology,the influence of magmatic activity on coalbed methane accumulation in Linxing area is expounded.According to the influence of magmatic activity on coal reservoirs,combined with the development of fissures associated with strata,the study area is divided into magma failure area,magmatic thermal influence dominant area,weak influence complex reservoir area and tectonic-buried depth control area.According to the difference of coalbed methane occlusion conditions,coalbed methane reservoir type as follows.Include the single-diking-hydrodynamic plug-type under weak magma,the fault-hydrodynamic plug-in type,the magmatic rock block and the inclined-hydrodynamic-magmatic rock mass composite.