Lukinov V.V., Zhykaliak M.V. Forecast of the position of promising sand reservoirs in the cross-section of the carboniferous gas-bearing stratum

Details
Parent Category: Geo-Technical Mechanics, 2019
Category: Geo-Technical Mechanics, 2019, № 148

Geoteh. meh. 2019, 148, 96-109

https://doi.org/10.1051/e3sconf/201910900051

Forecast of the position of promising sand reservoirs in the cross-section of the carboniferous gas-bearing stratum

1LukinovV.V., 2Zhykaliak M.V.

1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, 2State Regional Geological Enterprise «Donetskgeologiya» of the State Service of Geology and Mineral Resources of Ukraine

UDC 553.981.4.04.001.18:552.578.2.061.4

Language: English

Abstract.The results of the study of the effect of rock pressure in an undisturbed mine workings on the change in the density of sandstones within mine fields, areas of exploration of coal deposits of Donbas and some gas-condensate and oil-gas-condensate deposits of the Dnipro-Donetsk Depression(DDD) are presented.

It is noted, that within the same mine field, exploration site or gas field, the depth reflects modern lithostatic pressure, and also carries information on paleogravitational and paleotectonic pressure, which changed the reservoir properties of the rocks. For the conditions of Donbas, the open porosity of sandstones, on average, decreases by 3% for every 1000 m of an increase in the present depth of the rocks.

A generalized analysis of changes in gas saturation of the gas-bearing strata section using the example of sandstone reservoirs of gas-condensate and oil-gas-condensate fields of the DDD showed that the specific gas saturation of two hundred meter intervals of the gas-strata section, with an increase in the depth, first increases and then decreases.

It has been established, that with increasing occurrence depth in the DDD oil-gas-condensate and gas-condensate fields, as well as in the Donbas coal deposits, the change in the specific gas saturation of sandstone reservoirs in the vertical section of the gas-bearing strata in a parabolic relationship is caused by a change in the reservoir gas density and the gas pressure contained in them, diametrically opposite directions, which also affects the formation of a larger number of productive sandstone reservoirs in the middle of the section and the gas-bearing stratum.

In the DDD deposits, the depth interval at which increased values of specific gas saturation of the stratum in the section coincide with the interval at which the number of productive horizons increases, and the thickness of the interval of maximum gas saturation of sandstones is 34% of the thickness of the gas-bearing stratum. In the rocks of the coal-bearing stratum of the Donbas, as the mining layer is removed from the roof, the gas consumption and gas permeability of the reservoirs decrease, and the gas pressure increases, which forms the parabolic nature of the gas saturation of the sandstones worked out by mining.

Methods for calculating the positions of the upper and lower boundaries of the zone of maximum gas saturation of sandstone reservoirs within gas-bearing strata in coal, gas-condensate, and oil- gas-condensate deposits are proposed, including in the developed sandstones of coal mines, which makes it possible to determine objects in which it is advisable to search for gas accumulations.

Keywords:coal-gas, oil-gas-condensate and gas-condensate deposits, gas-bearing stratum, gas-bearing layer, sandstone reservoirs.

References

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About the authors

Lukinov Viacheslav Volodymyrovych, Doctor of Geology-Mineralogical Sciences (D. Sc), Principal Researcher in Department of Geology of Coal Beds at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine(IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Zhykaliak Mykola Vasilyovich, Doctor of Economic Sciences (D. Sc), General Director of State Regional Geological Enterprise “Donets’kgeologiya” of the State Service of Geology and Mineral Resources of Ukraine, Bakhmut, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.