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Journal of Mining Sciences

2015 year, number 4

Determination of Gas-Kinetic Parameters of a Block Coal Seam by Solving Inverse Problem Based on Borehole Gas Measurements

L. A. NAZAROVA1, L. A. NAZAROV1, A. L. KARCHEVSKY2, M. VANDAMME3
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2Sobolev Institute of Mathematics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 4, Novosibirsk, 630090 Russia
3Ecole des Ponts ParisTech-Laboratoire Navier, 6-8 Av. B. Pascal, 77420 Champs-sur-Marne, France
Keywords: углепородный массив, дегазация, газосодержание, коэффициент диффузии, обратная задача, coal and rock mass, degassing, gas content, diffusion coefficient, inverse problem

Abstract

In the framework of the developed and implemented nonlinear geomechanical model of a coal seam having block structure to describe gas influx in borehole, the authors propose the method for quantitative estimate of gas content and diffusion and mass exchange coefficients based on solution of inverse problems using pressure measurements taken in shut-in borehole in the “pressure drop” mode. Besides the main function, the set problem had an auxiliary objective function with the less number of arguments. Numerical experiments with synthetic input data show that the auxiliary objective function has a number of local minimums. The authors also put forward a technique of finding global minimum that provides the set problem solution.