Application Analysis Of Seismic Exploration In Tuha Coalfield And Santanghu Coalfield

Geophysical exploration is a branch of geophysics applied to the exploration of underground geological structures and the exploration of useful minerals.Geophysical exploration is an important part of comprehensive geological survey.The basic principle of geophysical exploration is to detect the change of strata lithology and structure by observing and studying the change of various geophysical fields.According to the parameters of different rock physical properties,the main geophysical methods are:seismic exploration,gravity exploration,electrical exploration,magnetic exploration,geophysical logging,geothermal exploration and so on.In addition,seismic exploration has the characteristics of less investment,abundant data,strong research ability and high precision.A high value for money.This paper selects Tuha coalfield and Santanghu coalfield on the two flanks of East Tianshan Mountain,Xinjiang.By analyzing the regional structure,coal geology,geographical environment,climate and other factors in the study area,the technical difficulties of seismic exploration in the two major coalfields are understood.In the west of Tuha coal field,the seismic geological conditions are the worst,the middle part is poor,the eastern seismic geological condition is moderate,the tendency is that the structure of Santanghu coalfield becomes better gradually from west to east,the structure of Santanghu coalfield is more complicated,the part is steep dip angle,the coal seam has many layers.The thickness varies greatly.In 3D seismic exploration,impedance inversion is used to explain the thickness variation of coal seam and coalbed bifurcation.The seismic exploration has achieved good results in the Santanghu coalfield,providing a complete solution for the Santanghu coalfield.In view of these technical problems,combined with the law of reflection wave development and spectrum characteristics of seismic exploration,this paper puts forward the construction parameters and technical solutions of seismic exploration in two coal fields:the Emergency plan must be set up before the construction of Tuha coalfield.To reduce the influence of wind on construction reasonably;to aim at the changing trend from west to east of coal field,to adopt the way of wide line,large arrangement and high coverage times in the west;to gradually transform eastward into a single line,medium arrangement,with emphasis on recording the high frequency part,Improve the resolution of seismic data.Through reasonable construction arrangement,quality control and targeted data processing,more successful seismic exploration data have been obtained in the whole coal field.And in three,In the Tanghu coalfield,the Kirchhoff integration method is used to prestack time migration to make the lower deviation point return to a reasonable position,and the investigation of low speed zone is carried out by using the method of small refraction in the light of the variation of the thickness of the loose layer in the Tanghu coalfield.An accurate near-surface model is established based on the measurement of the whole area,which lays the foundation for the formation of holes and static correction.In the 3D seismic exploration area,in addition to the conventional three high data processing,the wave impedance inversion work is carried out in the 3D seismic area by Jason software,and the variation of coal seam thickness,the bifurcation and the merger are quantitatively interpreted.In the Santanghu coalfield,good results have been obtained from the pre-survey to the 3-D seismic exploration stage in a sub-area,and a complete solution for the coalfield seismic exploration has been basically provided under the condition of little lateral change in the whole coal field.