Study On The Tectonic Evolution And The Potential Of Coalbed Methane Resources In Heshun Area,the Northeast Margin Of Qinshui Basin

Shanxi Heshun area is located in the northeast edge of Qinshui coalfield.The coal seam burial depth changes greatly.The structural background of the block is complex.The research on the potential of coalbed methane resources is weak.The study of this block can not only effectively solve the problem of coal mine gas management It is of great significance to ensure the safety of coal mining and provide new clean energy,which is beneficial to environmental protection.Through field geological surveys,joint surveys and statistical analysis,the method of orthographic projection was used,and stress recovery software was used to restore the principal stresses in the study area.,The direction of the maximum principal stress is near the SN direction;the phase of the maximum principal stress is NWW-SEE in the second Yanshan period;the direction of the maximum principal stress is NE-SW in the third Himalayan period,and the formation mechanism and structure of the study area are discussed.Tectonic evolution history.Based on coal rock porosity testing and prediction of fractures in coal reservoirs,the development characteristics of coal reservoir pores and fractures were analyzed.According to the development stage of the tectonic movement in the study area and the burial depth of the coal seam,the tectonic control of pore and fissure development is discussed.It is considered that the coal seam in the study area has experienced five burial stages.The effects have different effects,and the tectonic deformation has a controlling effect on the development of microfissures,which affects the density and opening degree of microfissures.The main geological controlling factors affecting the occurrence of coalbed methane are structure,burial depth,coal thickness,and roof and floor lithology.There is a good correlation between each index and coalbed methane content.The multivariate linear regression is used to obtain the regression equation between the coalbed methane content in the study area and the local quality indicators.The coalbed methane content,the comprehensive stress field environment,the coal seam fracture density,and gas content and other geological factors are predicted,which is beneficial to the development of coalbed methane resources in the study area The area was forecasted.The paper includes 64 pictures,13 tables and 130 references.