The Coal Seam Fire Zone Of The TEM Tesponse And Apparent Resistivity Distribution

With the rapid development of China’s economy, the demand for resources is becoming increasingly large, and considerable part of which rely on import, However, as our traditional energy of coal in some areas there is also a spontaneous combustion, the spontaneous combustion of coal is not just for the great waste of resources, moreover it brings many difficulties for the exploration and evaluation of coal resources, while, environmental problems caused by spontaneous combustion of coal cannot be ignored. So, how to identify and define the area witch the coal bed has burnt down, reduce the loss of production is an important issue before us. We can take advantage of its radiant heat values for evaluation for the region witch is burning, resource evaluation also no better way for no outcrop and no longer burning area. One thing is sure that the nature of the media will change after it combustion, accordingly, magnetic and electrical characteristics will also change, this article is aims at completed or not full burning, And the distribution range of coal resources witch already fought fire, we carried out detailed research by take advantage of its own transient electromagnetic corresponding and the difference of resistivity, then achieve the aim of delineation the area that the coal bed has burnt down.TEM is more mature in the comprehensive geophysical survey research, while, it is also a more effective means of geophysical exploration techniques. Because its installment choice is diverse along with the different place, it provides a number of physical parameters and reflects the terrestrial electricity information is extremely rich. This article uses the theory of transient electromagnetic to study the response of apparent resistivity in different levels of burn coal through indoor simulation experiments, to analysis the distribution law of the apparent resistivity in the area the coal bed burns down and define the area witch the coal bed has burnt down.First of all, making a IP detection of different electrode distance in the same conditions of the media through indoor simulation experiments, detecting different degree of coal combustion in the same electrode distance and conditions. Analysis and comparative different degree of coal combustion、apparent resistivity and the quantitative relation of apparent polarizability,witch obtained a linear relationship Variation of apparent resistivity and the degree of coal combustion. Find the distribution bound of different levels of burning coal bed. Second, through field experiments,we can get the appropriate frequency、detecting depth、integral time、gain and other parameters. Making out the best form of detecting equipment, to improve the accuracy of experiment and construction.Finally, carries on the macroscopic qualitative analysis by comprehensive all kinds of inversion map and table, Obtains the parameter rely on using data optimum in the practical work, furthermore, by using data fitting to define the area witch the coal bed has burnt down, and obtain the limits boundary apparent resistivity for200Ω·m of the whole burned area, apparent volatile matter should be5.41(1/Ω·m), establishing distinguish model by combined with other parameters, In order to promote the application in other areas.