SUPPLEMENTARY EXPLORATION OF SHALLOW COAL DEPOSITS BY ELECTRICAL TOMOGRAPHY METHOD AND 3D NUMERICAL SIMULATION

A. N. Fage 1, N. M. Yarkova 2, I. N. Eltsov 1

1 Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia; 2 Sibgeoresurs, Kemerovo, Russia

Due to its mobility, high informative value, and versatility, the electrical tomography method may be effectively applied to supplementary explore the shallow coal deposits that are being developed. It especially concerns those located in folded zones, with disrupted bedding and irregular thickness of beds. It should be noted that high resolution of electrical tomography allows identification of geological structure features that cannot be detected by other electrical methods. At the same time, there are some difficulties in interpretation of data acquired by the method, which is connected with both the nature of direct-current electrical survey and the software traditionally used. The main software used for simulating inversion based on electrical tomography method is characterized by 2D reverse problem statement. Thus, objects located remote from the survey profile but affecting the registered signals are not taken into account. Therefore, it is important to apply 3D numerical simulation for correct interpretation of data acquired by electrical tomography, especially when surveying objects complicated by multiple tectonic dislocations.

Key words: supplementary exploration, electrical tomography, 3D numerical simulation, shallow coal deposits, vertical electrical sounding.

DOI 10.20403/2078-0575-2017-1-111-123

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