HYDROGEOLOGY OF THE ERUNAKOVO REGION OF THE KUZNETSK BASIN IN THE CONTEXT OF COAL METHANE FORMATION AND MINING
S.L. Shvartsev, V.T. Khryukin*, E.V. Domrocheva, K.I. Kuzevanov**, N.M. Rasskazov, T.S. Popova*, O.E. Lepokurova**, and E.V. Shvachko*
Tomsk Department of the Institute of Petroleum Geology and Geophysics, Siberian Branch of the RAS,
3 prosp. Akademichesky, Tomsk, 634021, Russia
* Promgas Joint-Stock Company, 6 ul. Nametkina, Moscow, 117420, Russia
** Tomsk Polytechnical University, 30 prosp. Lenina, Tomsk, 634034, Russia
Keywords: Coal, methane, hydrogeology, water exchange, mineralization, coal beds, isotopes
Pages: 878-889
Abstract
Detailed study was given to the hydrogeology of the coal methane-promising Erunakovo region. We have established that all aquifers there are mutually related and form a single aquifer complex consisting of a series of microbeds of different water transmissivities and permeabilities. Two zones have been recognized in the Erunakovo region - of intense and slow water exchange (fresh- and brackish-water, respectively). Fresh waters with mineralization of up to 1 g/l and pH = 7-8 occur at depths down to ~300 m or, seldom, 500 m. Brackish waters have mineralization of 1-13 g/l and pH reaching 10.1. The higher mineralization is due to the higher contents of HCO3- and Na and, sometimes, SO42, produced through sulfide oxidation, and Cl-, concentrated as a result of evaporation. In the study region, CO2 is not of mantle genesis but is the product of coal metamorphism.
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