Spectral Characteristics Of Complex Resistivity Of Tectonic Coal And Cole-Cole Model Inversion

Tectonic coal is coal seam by the product of geological tectonic compression and shearing action,and closely related to the major disasters in coal mine coal and gas outburst,complex resistance method of geophysical prospecting technique has been successfully applied in the assessment of rock pore-fracture,complex resistivity of tectonic coal experiment study,to explore the complex resistance identification method of tectonic coal has an important significance for mine gas disaster prediction.This article USES the comparative analysis method,the complex resistance measurement technology,carry out the analysis of tectonic coal macroscopic observation and type,complex resistivity measurement of different kinds of tectonic coal,based on tectonic coal Cole-Cole,model parameters of complex resistivity inversion,tectonic coal and complex method,parameter optimization and so on four aspects of research,aimed at tectonic coal structure,structural type,reveal the tectonic coal 0.1 ～ 100 KHz frequency range complex resistivity response characteristics,the screening of tectonic coal sensitive parameters identification of complex method.The research results and conclusions are as follows:(1)Tectonic coal can be clearly identified based on complex resistivity method.Through the comparative analysis of the structure of the hongwei mining area of hunan and henan jiyuan mining area coal compared with primary structure coal complex resistivity data found that hongwei tectonic coal and primary structure of coal mining area of magnitude of complex resistivity varies widely,the native structure of coal is greater than the tectonic coal complex resistivity,all coal samples have strong induced polarization effect that cause complex resistivity dispersion real imaginary part of the phenomenon;The complex resistivity of the primary structural coal is lower than that of the structural coal.The whole coal sample shows excellent conductivity and weak dispersion caused by the induced polarization effect.(2)Different types of tectonic coals can be clearly identified based on complex resistivity method.Through comparative analysis,the complex resistivity data of structural coal and primary structural coal in Hongwei mining area of Hunan Province are compared.It is found that the order of magnitude of complex resistivity of different types of structural coal is greatly different.The complex resistivity is shown as(mylonitic coal > porphyroclastic coal > cataclastic coal > granulated coal > pulverized coal> squamate coal);The anisotropy of primary structural coal and cataclastic coal is strong,but the anisotropy of other types is not obvious.The complex resistivity of squamate coal is very small compared with other coal samples.(3)The stratification,compactness,the existence of fractures,structural evolution of tectonic coal and particle size are the structural and structural reasons for the differences in complex resistivity.The complex resistivity anisotropy of primary structural coal and cataclastic coal in Hongwei mine area is affected by the stratification of coal.In the sequence of tectonic coals,the complex resistivity of squamate coals is the lowest because the structural evolution of tectonic coals tends to graphitization.In the sequence of tectonic coals,the complex resistivity of mylonite is the highest,followed by porphyroclastic coal,followed by granulated and pulverized coal.This phenomenon is mainly caused by the density of coal,in which the mylonite sample is the loosest and the pulverized coal sample is the densest.The effect of particle size on complex resistivity is weak.Due to the high metamorphic degree of the primary structural coal and structural coal in Jiyuan mining area,the complex resistivity value is small.(4)Compared with other inversion parameters,inversion parameters Z0 and τ can better reflect the structure-tectonic characteristics of tectonic coal.Through the selection of the inversion parameters of complex resistivity Cole-Cole model of tectonic coal in Hongwei mining area,the Z0 and τ in tectonic coal series show a better ability to identify tectonic coal.In this experiment,the inversion parameters M and C are difficult to distinguish the structural differences between tectonic coal and raw coal.The complex resistivity data in Jiyuan mining area is not suitable for Cole-Cole model inversion.And analyze the mechanism of tectonic coal IP as follows: the coal macromolecular electronic channel,minerals and moisture adsorption pore fissure structure of ion channels,electrical conductivity of coal is strong or weak reason is by the electronic channel with combination of ion channels occurring simultaneously as a result,the coal body structure factors,reflect the phenomenon of the conductivity of different kinds of tectonic coal is different,so as to put forward the tectonic coal conductive mechanism model;The dispersion phenomenon of structural coal and primary structural coal in 0.1Hz ～ 100 k Hz is caused by interface polarization.The induced polarization unit model and equivalent circuit of coal are proposed to facilitate the understanding.